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The above command will fail, as the output pad labelled [outv] has been mapped twice. None of the output files shall be processed.
The video stream from B. Then a copy each is mapped to the first and third output files. The overlay filter, requiring two video inputs, uses the first two unused video streams. Those are the streams from A. The aresample filter is sent the first unused audio stream, that of A. Since this filter output is also unlabelled, it too is mapped to the first output file. The presence of -an only suppresses automatic or manual stream selection of audio streams, not outputs sent from filtergraphs.
Both these mapped streams shall be ordered before the mapped stream in out1. The video, audio and subtitle streams mapped to out2. Options which do not take arguments are boolean options, and set the corresponding value to true. They can be set to false by prefixing the option name with “no”. For example using “-nofoo” will set the boolean option with name “foo” to false. Some options are applied per-stream, e. Stream specifiers are used to precisely specify which stream s a given option belongs to.
A stream specifier is a string generally appended to the option name and separated from it by a colon. Therefore, it would select the ac3 codec for the second audio stream.
A stream specifier can match several streams, so that the option is applied to all of them. An empty stream specifier matches all streams. For example, -codec copy or -codec: copy would copy all the streams without reencoding. Matches the stream with this index.
Stream numbering is based on the order of the streams as detected by libavformat except when a program ID is also specified. In this case it is based on the ordering of the streams in the program. Otherwise, it matches all streams of the specified type. Matches streams with the metadata tag key having the specified value. If value is not given, matches streams that contain the given tag with any value. Matches streams with usable configuration, the codec must be defined and the essential information such as video dimension or audio sample rate must be present.
Show help. An optional parameter may be specified to print help about a specific item. If no argument is specified, only basic non advanced tool options are shown. Print complete list of options, including shared and private options for encoders, decoders, demuxers, muxers, filters, etc.
Use the -decoders option to get a list of all decoders. Use the -encoders option to get a list of all encoders. Use the -formats option to get a list of all demuxers and muxers. Use the -formats option to get a list of all muxers and demuxers. Use the -filters option to get a list of all filters.
Use the -bsfs option to get a list of all bitstream filters. Use the -protocols option to get a list of all protocols. Show autodetected sources of the input device. Some devices may provide system-dependent source names that cannot be autodetected.
The returned list cannot be assumed to be always complete. Show autodetected sinks of the output device. Some devices may provide system-dependent sink names that cannot be autodetected.
Indicates that repeated log output should not be compressed to the first line and the “Last message repeated n times” line will be omitted. Indicates that log output should add a [level] prefix to each message line. This can be used as an alternative to log coloring, e. Only show fatal errors which could lead the process to crash, such as an assertion failure.
This is not currently used for anything. Show all warnings and errors. Any message related to possibly incorrect or unexpected events will be shown. Show informative messages during processing. This is in addition to warnings and errors.
This is the default value. For example to enable repeated log output, add the level prefix, and set loglevel to verbose :. Another example that enables repeated log output without affecting current state of level prefix flag or loglevel :. By default the program logs to stderr. If coloring is supported by the terminal, colors are used to mark errors and warnings.
This file can be useful for bug reports. It also implies -loglevel debug. For example, to output a report to a file named ffreport. All FFmpeg tools will normally show a copyright notice, build options and library versions. This option can be used to suppress printing this information. Allows setting and clearing cpu flags. This option is intended for testing. Override detection of CPU count. Exercise extreme caution when using this option. These options are provided directly by the libavformat, libavdevice and libavcodec libraries.
To see the list of available AVOptions, use the -help option. They are separated into two categories:. These options can be set for any container, codec or device. These options are specific to the given container, device or codec. For example to write an ID3v2. In the above example, a multichannel audio stream is mapped twice for output.
The first instance is encoded with codec ac3 and bitrate k. The second instance is downmixed to 2 channels and encoded with codec aac. A bitrate of k is specified for it using absolute index of the output stream. Force input or output file format. The format is normally auto detected for input files and guessed from the file extension for output files, so this option is not needed in most cases.
Set number of times input stream shall be looped. Loop 0 means no loop, loop -1 means infinite loop. Allow forcing a decoder of a different media type than the one detected or designated by the demuxer. Useful for decoding media data muxed as data streams. Select an encoder when used before an output file or a decoder when used before an input file for one or more streams.
When used as an input option before -i , limit the duration of data read from the input file. When used as an output option before an output url , stop writing the output after its duration reaches duration. Stop writing the output or reading the input at position. Set the file size limit, expressed in bytes.
No further chunk of bytes is written after the limit is exceeded. The size of the output file is slightly more than the requested file size. When used as an input option before -i , seeks in this input file to position.
Note that in most formats it is not possible to seek exactly, so ffmpeg will seek to the closest seek point before position. When used as an output option before an output url , decodes but discards input until the timestamps reach position. Like the -ss option but relative to the “end of file”. That is negative values are earlier in the file, 0 is at EOF.
This will take the difference between the start times of the target and reference inputs and offset the timestamps of the target file by that difference. The source timestamps of the two inputs should derive from the same clock source for expected results. If either of the inputs has no starting timestamp then no sync adjustment is made.
Acceptable values are those that refer to a valid ffmpeg input index. If the sync reference is the target index itself or -1 , then no adjustment is made to target timestamps. A sync reference may not itself be synced to any other input.
The offset is added to the timestamps of the input files. Specifying a positive offset means that the corresponding streams are delayed by the time duration specified in offset. It is also possible to delete metadata by using an empty value.
By default, the disposition is copied from the input stream, unless the output stream this option applies to is fed by a complex filtergraph – in that case the disposition is unset by default. Otherwise the first item is not prefixed this options overrides the default value. It is also possible to clear the disposition by setting it to 0.
To make the second subtitle stream the default stream and remove the default disposition from the first subtitle stream:. Specify target file type vcd , svcd , dvd , dv , dv All the format options bitrate, codecs, buffer sizes are then set automatically. You can just type:. Nevertheless you can specify additional options as long as you know they do not conflict with the standard, as in:.
The dv50 target is identical to the dv target except that the pixel format set is yuvp for all three standards. Any user-set value for a parameter above will override the target preset value. In that case, the output may not comply with the target standard.
As an input option, blocks all data streams of a file from being filtered or being automatically selected or mapped for any output. See -discard option to disable streams individually. As an output option, disables data recording i. For full manual control see the -map option.
Set the number of data frames to output. This is an obsolete alias for -frames:d , which you should use instead. Use fixed quality scale VBR. In the filtergraph, the input is associated to the label in , and the output to the label out. See the ffmpeg-filters manual for more information about the filtergraph syntax. This option is similar to -filter , the only difference is that its argument is the name of the file from which a filtergraph description is to be read. This boolean option determines if the filtergraph s to which this stream is fed gets reinitialized when input frame parameters change mid-stream.
This option is enabled by default as most video and all audio filters cannot handle deviation in input frame properties. Upon reinitialization, existing filter state is lost, like e. Any frames buffered at time of reinitialization are lost. The properties where a change triggers reinitialization are, for video, frame resolution or pixel format; for audio, sample format, sample rate, channel count or channel layout. Defines how many threads are used to process a filter pipeline. Each pipeline will produce a thread pool with this many threads available for parallel processing.
The default is the number of available CPUs. It is on by default, to explicitly disable it you need to specify -nostats. Progress information is written periodically and at the end of the encoding process. The last key of a sequence of progress information is always “progress”. Enable interaction on standard input.
On by default unless standard input is used as an input. To explicitly disable interaction you need to specify -nostdin. Disabling interaction on standard input is useful, for example, if ffmpeg is in the background process group. Roughly the same result can be achieved with ffmpeg Print timestamp information. It is off by default. This option is mostly useful for testing and debugging purposes, and the output format may change from one version to another, so it should not be employed by portable scripts.
Add an attachment to the output file. This is supported by a few formats like Matroska for e. Attachments are implemented as a specific type of stream, so this option will add a new stream to the file. It is then possible to use per-stream options on this stream in the usual way. Attachment streams created with this option will be created after all the other streams i. Extract the matching attachment stream into a file named filename. If filename is empty, then the value of the filename metadata tag will be used.
Technical note — attachments are implemented as codec extradata, so this option can actually be used to extract extradata from any stream, not just attachments. Set the number of video frames to output. This is an obsolete alias for -frames:v , which you should use instead.
As an input option, ignore any timestamps stored in the file and instead generate timestamps assuming constant frame rate fps. This is not the same as the -framerate option used for some input formats like image2 or v4l2 it used to be the same in older versions of FFmpeg. If in doubt use -framerate instead of the input option -r. As an output option, duplicate or drop input frames to achieve constant output frame rate fps.
Clamps output frame rate when output framerate is auto-set and is higher than this value. Useful in batch processing or when input framerate is wrongly detected as very high. It cannot be set together with -r. It is ignored during streamcopy. As an output option, this inserts the scale video filter to the end of the corresponding filtergraph. Please use the scale filter directly to insert it at the beginning or some other place.
For example “”, “”, “1. If used together with -vcodec copy , it will affect the aspect ratio stored at container level, but not the aspect ratio stored in encoded frames, if it exists.
As an input option, blocks all video streams of a file from being filtered or being automatically selected or mapped for any output. As an output option, disables video recording i. Select the pass number 1 or 2. It is used to do two-pass video encoding. The statistics of the video are recorded in the first pass into a log file see also the option -passlogfile , and in the second pass that log file is used to generate the video at the exact requested bitrate.
On pass 1, you may just deactivate audio and set output to null, examples for Windows and Unix:. This is an alias for -filter:v , see the -filter option. Automatically rotate the video according to file metadata. Enabled by default, use -noautorotate to disable it. Automatically scale the video according to the resolution of first frame.
Enabled by default, use -noautoscale to disable it. Therefore, it is not recommended to disable it unless you really know what you are doing. Disable autoscale at your own risk.
Set pixel format. If the selected pixel format can not be selected, ffmpeg will print a warning and select the best pixel format supported by the encoder. Rate control override for specific intervals, formatted as “int,int,int” list separated with slashes. Two first values are the beginning and end frame numbers, last one is quantizer to use if positive, or quality factor if negative. Use this option if your input file is interlaced and you want to keep the interlaced format for minimum losses.
The alternative is to deinterlace the input stream by use of a filter such as yadif or bwdif , but deinterlacing introduces losses. Calculate PSNR of compressed frames. If the argument consists of timestamps, ffmpeg will round the specified times to the nearest output timestamp as per the encoder time base and force a keyframe at the first frame having timestamp equal or greater than the computed timestamp.
Note that if the encoder time base is too coarse, then the keyframes may be forced on frames with timestamps lower than the specified time. If one of the times is ” chapters [ delta ]”, it is expanded into the time of the beginning of all chapters in the file, shifted by delta , expressed as a time in seconds. This option can be useful to ensure that a seek point is present at a chapter mark or any other designated place in the output file. For example, to insert a key frame at 5 minutes, plus key frames 0.
If the argument is prefixed with expr: , the string expr is interpreted like an expression and is evaluated for each frame. A key frame is forced in case the evaluation is non-zero. If the argument is source , ffmpeg will force a key frame if the current frame being encoded is marked as a key frame in its source.
In cases where this particular source frame has to be dropped, enforce the next available frame to become a key frame instead. Note that forcing too many keyframes is very harmful for the lookahead algorithms of certain encoders: using fixed-GOP options or similar would be more efficient.
Initialise a new hardware device of type type called name , using the given device parameters. The set of devices can also be filtered using the key-value pairs to find only devices matching particular platform or device strings.
If device is an integer, it selects the device by its index in a system-dependent list of devices. If device is any other string, it selects the first device with a name containing that string as a substring. Initialise a new hardware device of type type called name , deriving it from the existing device with the name source.
Pass the hardware device called name to all filters in any filter graph. This can be used to set the device to upload to with the hwupload filter, or the device to map to with the hwmap filter. Other filters may also make use of this parameter when they require a hardware device. Note that this is typically only required when the input is not already in hardware frames – when it is, filters will derive the device they require from the context of the frames they receive as input.
Use hardware acceleration to decode the matching stream s. The allowed values of hwaccel are:. Unlike most other values, this option does not enable accelerated decoding that is used automatically whenever a qsv decoder is selected , but accelerated transcoding, without copying the frames into the system memory. For it to work, both the decoder and the encoder must support QSV acceleration and no filters must be used.
This option has no effect if the selected hwaccel is not available or not supported by the chosen decoder. Note that most acceleration methods are intended for playback and will not be faster than software decoding on modern CPUs.
Additionally, ffmpeg will usually need to copy the decoded frames from the GPU memory into the system memory, resulting in further performance loss. This option is thus mainly useful for testing. This option only makes sense when the -hwaccel option is also specified. List all hardware acceleration components enabled in this build of ffmpeg. Actual runtime availability depends on the hardware and its suitable driver being installed.
Set the number of audio frames to output. This is an obsolete alias for -frames:a , which you should use instead.
Set the audio sampling frequency. For output streams it is set by default to the frequency of the corresponding input stream. For input streams this option only makes sense for audio grabbing devices and raw demuxers and is mapped to the corresponding demuxer options. Set the number of audio channels. For output streams it is set by default to the number of input audio channels.
As an input option, blocks all audio streams of a file from being filtered or being automatically selected or mapped for any output. As an output option, disables audio recording i. Set the audio sample format. This is an alias for -filter:a , see the -filter option. If some input channel layout is not known, try to guess only if it corresponds to at most the specified number of channels. For example, 2 tells to ffmpeg to recognize 1 channel as mono and 2 channels as stereo but not 6 channels as 5.
The default is to always try to guess. Use 0 to disable all guessing. As an input option, blocks all subtitle streams of a file from being filtered or being automatically selected or mapped for any output. As an output option, disables subtitle recording i. Fix subtitles durations. For each subtitle, wait for the next packet in the same stream and adjust the duration of the first to avoid overlap.
This is necessary with some subtitles codecs, especially DVB subtitles, because the duration in the original packet is only a rough estimate and the end is actually marked by an empty subtitle frame.
Failing to use this option when necessary can result in exaggerated durations or muxing failures due to non-monotonic timestamps. Note that this option will delay the output of all data until the next subtitle packet is decoded: it may increase memory consumption and latency a lot. Create one or more streams in the output file. A – character before the stream identifier creates a “negative” mapping. It disables matching streams from already created mappings.
A trailing? Note the map will still fail if an invalid input file index is used; such as if the map refers to a non-existent input. This option may be specified multiple times, each adding more streams to the output file. Any given input stream may also be mapped any number of times as a source for different output streams, e. The streams are created in the output in the same order in which the -map options are given on the commandline.
If you have two audio streams in the first input file, these streams are identified by and You can use -map to select which streams to place in an output file. For example:. To select the stream with index 2 from input file a. To map the video and audio streams from the first input, and using the trailing?
Allow input streams with unknown type to be copied instead of failing if copying such streams is attempted. This option is deprecated and will be removed. It can be replaced by the pan filter. In some cases it may be easier to use some combination of the channelsplit , channelmap , or amerge filters. Map an audio channel from a given input to an output.
For example, assuming INPUT is a stereo audio file, you can switch the two audio channels with the following command:. The following example splits the channels of a stereo input into two separate streams, which are put into the same output file:. It is therefore not currently possible, for example, to turn two separate mono streams into a single stereo stream. However splitting a stereo stream into two single channel mono streams is possible. If you need this feature, a possible workaround is to use the amerge filter.
For example, if you need to merge a media here input. To map the first two audio channels from the first input, and using the trailing? Set metadata information of the next output file from infile. Note that those are file indices zero-based , not filenames. A metadata specifier can have the following forms:.
In an input metadata specifier, the first matching stream is copied from. In an output metadata specifier, all matching streams are copied to. These default mappings are disabled by creating any mapping of the relevant type. A negative file index can be used to create a dummy mapping that just disables automatic copying.
For example to copy metadata from the first stream of the input file to global metadata of the output file:. Note that simple 0 would work as well in this example, since global metadata is assumed by default. If no chapter mapping is specified, then chapters are copied from the first input file with at least one chapter.
Use a negative file index to disable any chapter copying. Show benchmarking information at the end of an encode. Shows real, system and user time used and maximum memory consumption. Maximum memory consumption is not supported on all systems, it will usually display as 0 if not supported. Show benchmarking information during the encode. Its value is a floating-point positive number which represents the maximum duration of media, in seconds, that should be ingested in one second of wallclock time.
Default value is zero and represents no imposed limitation on speed of ingestion. Value 1 represents real-time speed and is equivalent to -re. Mainly used to simulate a capture device or live input stream e. Should not be used with a low value when input is an actual capture device or live stream as it may cause packet loss.
For compatibility reasons some of the values for vsync can be specified as numbers shown in parentheses in the following table. Frames are passed through with their timestamp or dropped so as to prevent 2 frames from having the same timestamp. As passthrough but destroys all timestamps, making the muxer generate fresh timestamps based on frame-rate.
Note that the timestamps may be further modified by the muxer, after this. With -map you can select from which stream the timestamps should be taken.
You can leave either video or audio unchanged and sync the remaining stream s to the unchanged one. Frame drop threshold, which specifies how much behind video frames can be before they are dropped. In frame rate units, so 1. The default is One possible usecase is to avoid framedrops in case of noisy timestamps or to increase frame drop precision in case of exact timestamps. Audio sync method. Pad the output audio stream s.
This is the same as applying -af apad. Argument is a string of filter parameters composed the same as with the apad filter. Do not process input timestamps, but keep their values without trying to sanitize them. In particular, do not remove the initial start time offset value.
Note that, depending on the vsync option or on specific muxer processing e. This means that using e. Specify how to set the encoder timebase when stream copying. The time base is copied to the output encoder from the corresponding input demuxer. This is sometimes required to avoid non monotonically increasing timestamps when copying video streams with variable frame rate.
Set the encoder timebase. This field can be provided as a ratio of two integers e. Note that this option may require buffering frames, which introduces extra latency. The -shortest option may require buffering potentially large amounts of data when at least one of the streams is “sparse” i. This option controls the maximum duration of buffered frames in seconds. Larger values may allow the -shortest option to produce more accurate results, but increase memory use and latency. Timestamp error delta threshold.
Assign a new stream-id value to an output stream. This option should be specified prior to the output filename to which it applies.
For the situation where multiple output files exist, a streamid may be reassigned to a different value. Set bitstream filters for matching streams. Use the -bsfs option to get the list of bitstream filters. Specify Timecode for writing.
Define a complex filtergraph, i. For simple graphs — those with one input and one output of the same type — see the -filter options. An unlabeled input will be connected to the first unused input stream of the matching type. Output link labels are referred to with -map.
Unlabeled outputs are added to the first output file. Here [0:v] refers to the first video stream in the first input file, which is linked to the first main input of the overlay filter. Similarly the first video stream in the second input is linked to the second overlay input of overlay.
Assuming there is only one video stream in each input file, we can omit input labels, so the above is equivalent to. Furthermore we can omit the output label and the single output from the filter graph will be added to the output file automatically, so we can simply write. As a special exception, you can use a bitmap subtitle stream as input: it will be converted into a video with the same size as the largest video in the file, or x if no video is present.
Note that this is an experimental and temporary solution. It will be removed once libavfilter has proper support for subtitles. This option enables or disables accurate seeking in input files with the -ss option. It is enabled by default, so seeking is accurate when transcoding. This option enables or disables seeking by timestamp in input files with the -ss option. It is disabled by default.
If enabled, the argument to the -ss option is considered an actual timestamp, and is not offset by the start time of the file. This matters only for files which do not start from timestamp 0, such as transport streams.
For input, this option sets the maximum number of queued packets when reading from the file or device. By default ffmpeg only does this if multiple inputs are specified. For output, this option specified the maximum number of packets that may be queued to each muxing thread.
Print sdp information for an output stream to file. Requires at least one of the output formats to be rtp. Allows discarding specific streams or frames from streams. Any input stream can be fully discarded, using value all whereas selective discarding of frames from a stream occurs at the demuxer and is not supported by all demuxers.
Set fraction of decoding frame failures across all inputs which when crossed ffmpeg will return exit code Crossing this threshold does not terminate processing. Range is a floating-point number between 0 to 1. While waiting for that to happen, packets for other streams are buffered. This option sets the size of this buffer, in packets, for the matching output stream.
The default value of this option should be high enough for most uses, so only touch this option if you are sure that you need it. This is a minimum threshold until which the muxing queue size is not taken into account. Defaults to 50 megabytes per stream, and is based on the overall size of packets passed to the muxer. If filter format negotiation requires a conversion, the initialization of the filters will fail.
Conversions can still be performed by inserting the relevant conversion filter scale, aresample in the graph. Declare the number of bits per raw sample in the given output stream to be value. Setting values that do not match the stream properties may result in encoding failures or invalid output files. Check the presets directory in the FFmpeg source tree for examples.
The fpre option takes the filename of the preset instead of a preset name as input and can be used for any kind of codec. For the vpre , apre , and spre options, the options specified in a preset file are applied to the currently selected codec of the same type as the preset option.
The argument passed to the vpre , apre , and spre preset options identifies the preset file to use according to the following rules:. First ffmpeg searches for a file named arg. For example, if the argument is libvpxp , it will search for the file libvpxp. For example, if you select the video codec with -vcodec libvpx and use -vpre p , then it will search for the file libvpxp.
They work similar to ffpreset files, but they only allow encoder- specific options. When the pre option is specified, ffmpeg will look for files with the suffix.
For example, if you select the video codec with -vcodec libvpx and use -pre p , then it will search for the file libvpxp. If no such file is found, then ffmpeg will search for a file named arg. Note that you must activate the right video source and channel before launching ffmpeg with any TV viewer such as xawtv by Gerd Knorr. You also have to set the audio recording levels correctly with a standard mixer. The Y files use twice the resolution of the U and V files. They are raw files, without header.
They can be generated by all decent video decoders. You must specify the size of the image with the -s option if ffmpeg cannot guess it. Each frame is composed of the Y plane followed by the U and V planes at half vertical and horizontal resolution. Converts a. Furthermore, the audio stream is MP3-encoded so you need to enable LAME support by passing –enable-libmp3lame to configure. The mapping is particularly useful for DVD transcoding to get the desired audio language.
This will extract one video frame per second from the video and will output them in files named foo Images will be rescaled to fit the new WxH values. If you want to extract just a limited number of frames, you can use the above command in combination with the -frames:v or -t option, or in combination with -ss to start extracting from a certain point in time. It is the same syntax supported by the C printf function, but only formats accepting a normal integer are suitable.
The resulting output file test FFmpeg adopts the following quoting and escaping mechanism, unless explicitly specified. The following rules are applied:. Note that you may need to add a second level of escaping when using the command line or a script, which depends on the syntax of the adopted shell language. Time is local time unless Z is appended, in which case it is interpreted as UTC. If the year-month-day part is not specified it takes the current year-month-day.
HH expresses the number of hours, MM the number of minutes for a maximum of 2 digits, and SS the number of seconds for a maximum of 2 digits. The m at the end expresses decimal value for SS. S expresses the number of seconds, with the optional decimal part m. Specify the size of the sourced video, it may be a string of the form width x height , or the name of a size abbreviation.
Specify the frame rate of a video, expressed as the number of frames generated per second. A ratio can be expressed as an expression, or in the form numerator : denominator.
It can be the name of a color as defined below case insensitive match or a [0x ]RRGGBB[AA] sequence, possibly followed by and a string representing the alpha component. The alpha component may be a string composed by “0x” followed by an hexadecimal number or a decimal number between 0. A channel layout specifies the spatial disposition of the channels in a multi-channel audio stream. To specify a channel layout, FFmpeg makes use of a special syntax. Each term can be:.
Before libavutil version 53 the trailing character “c” to specify a number of channels was optional, but now it is required, while a channel layout mask can also be specified as a decimal number if and only if not followed by “c” or “C”.
Two expressions expr1 and expr2 can be combined to form another expression ” expr1 ; expr2 “. Return 1 if x is greater than or equal to min and lesser than or equal to max , 0 otherwise. The results of the evaluation of x and y are converted to integers before executing the bitwise operation.
Note that both the conversion to integer and the conversion back to floating point can lose precision. Round the value of expression expr upwards to the nearest integer.
For example, “ceil 1. Round the value of expression expr downwards to the nearest integer. For example, “floor Return the greatest common divisor of x and y. If both x and y are 0 or either or both are less than zero then behavior is undefined. Evaluate x , and if the result is non-zero return the result of the evaluation of y , return 0 otherwise.
Evaluate x , and if the result is non-zero return the evaluation result of y , otherwise the evaluation result of z. Evaluate x , and if the result is zero return the result of the evaluation of y , return 0 otherwise. Evaluate x , and if the result is zero return the evaluation result of y , otherwise the evaluation result of z. Load the value of the internal variable with number var , which was previously stored with st var , expr.
The function returns the loaded value. Print the value of expression t with loglevel l. If l is not specified then a default log level is used. Returns the value of the expression printed. Return a pseudo random value between 0. Find an input value for which the function represented by expr with argument ld 0 is 0 in the interval When the expression evaluates to 0 then the corresponding input value will be returned.
Round the value of expression expr to the nearest integer. For example, “round 1. Compute the square root of expr. Store the value of the expression expr in an internal variable. The function returns the value stored in the internal variable. Note, Variables are currently not shared between expressions.
Evaluate a Taylor series at x , given an expression representing the ld id -th derivative of a function at 0. If id is not specified then 0 is assumed. Note, when you have the derivatives at y instead of 0, taylor expr, x-y can be used. Round the value of expression expr towards zero to the nearest integer.
For example, “trunc Evaluate expression expr while the expression cond is non-zero, and returns the value of the last expr evaluation, or NAN if cond was always false.
Assuming that an expression is considered “true” if it has a non-zero value, note that:. In your C code, you can extend the list of unary and binary functions, and define recognized constants, so that they are available for your expressions. The evaluator also recognizes the International System unit prefixes.
The list of available International System prefixes follows, with indication of the corresponding powers of 10 and of 2. In addition each codec may support so-called private options, which are specific for a given codec. Sometimes, a global option may only affect a specific kind of codec, and may be nonsensical or ignored by another, so you need to be aware of the meaning of the specified options. Also some options are meant only for decoding or encoding.
In 1-pass mode, bitrate tolerance specifies how far ratecontrol is willing to deviate from the target average bitrate value. Lowering tolerance too much has an adverse effect on quality. Only write platform-, build- and time-independent data. This ensures that file and data checksums are reproducible and match between platforms. Its primary use is for regression testing. It is the fundamental unit of time in seconds in terms of which frame timestamps are represented.
Set cutoff bandwidth. Supported only by selected encoders, see their respective documentation sections. It is set by some decoders to indicate constant frame size. Set video quantizer scale compression VBR. It is used as a constant in the ratecontrol equation. Must be an integer between -1 and If a value of -1 is used, it will choose an automatic value depending on the encoder. Note: experimental decoders can pose a security risk, do not use this for decoding untrusted input. This is useful if you want to analyze the content of a video and thus want everything to be decoded no matter what.
This option will not result in a video that is pleasing to watch in case of errors. Most useful in setting up a CBR encode. It is of little use elsewise. At present, those are H. Supported at present by AV1 decoders.
Set the number of threads to be used, in case the selected codec implementation supports multi-threading. Set encoder codec profile. Encoder specific profiles are documented in the relevant encoder documentation. Possible values:. Set to 1 to disable processing alpha transparency. Default is 0.
Separator used to separate the fields printed on the command line about the Stream parameters. For example, to separate the fields with newlines and indentation:. Maximum number of pixels per image.
This value can be used to avoid out of memory failures due to large images. Enable cropping if cropping parameters are multiples of the required alignment for the left and top parameters. If the alignment is not met the cropping will be partially applied to maintain alignment.
Default is 1 enabled. When you configure your FFmpeg build, all the supported native decoders are enabled by default. Decoders requiring an external library must be enabled manually via the corresponding –enable-lib option.
You can list all available decoders using the configure option –list-decoders. Requires the presence of the libdav1d headers and library during configuration. You need to explicitly configure the build with –enable-libdav1d. Set amount of frame threads to use during decoding.
The default value is 0 autodetect. Use the global option threads instead. Set amount of tile threads to use during decoding. Apply film grain to the decoded video if present in the bitstream.
Defaults to the internal default of the library. This option is deprecated and will be removed in the future. Select an operating point of a scalable AV1 bitstream 0 – Requires the presence of the libuavs3d headers and library during configuration.
You need to explicitly configure the build with –enable-libuavs3d. Set the line size of the v data in bytes. You can use the special -1 value for a strideless v as seen in BOXX files. Dynamic Range Scale Factor. The factor to apply to dynamic range values from the AC-3 stream. This factor is applied exponentially.
The default value is 1. There are 3 notable scale factor ranges:. DRC enabled. Applies a fraction of the stream DRC value. Audio reproduction is between full range and full compression. Loud sounds are fully compressed. Soft sounds are enhanced. The lavc FLAC encoder used to produce buggy streams with high lpc values like the default value. This decoder generates wave patterns according to predefined sequences. Very beautiful house “le Clos du chat tambour”, of m2 with basement, for sale on the Alabaster coast in Seine Maritime This house with a garden of m2, benefits from an exceptional location, quiet, 3km from the sea and 7 km from the city center Sell a living room coffee table made of exotic solid wood.
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