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This should simplify inclusion in monolithic tool manuals.pull/21/head
Stefano Sabatini
12 years ago
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@chapter Format Options |
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@c man begin FORMAT OPTIONS |
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The libavformat library provides some generic global options, which |
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can be set on all the muxers and demuxers. In addition each muxer or |
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demuxer may support so-called private options, which are specific for |
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that component. |
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Options may be set by specifying -@var{option} @var{value} in the |
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FFmpeg tools, or by setting the value explicitly in the |
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@code{AVFormatContext} options or using the @file{libavutil/opt.h} API |
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for programmatic use. |
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The list of supported options follows: |
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@table @option |
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@item avioflags @var{flags} (@emph{input/output}) |
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Possible values: |
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@table @samp |
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@item direct |
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Reduce buffering. |
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@end table |
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@item probesize @var{integer} (@emph{input}) |
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Set probing size in bytes, i.e. the size of the data to analyze to get |
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stream information. A higher value will allow to detect more |
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information in case it is dispersed into the stream, but will increase |
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latency. Must be an integer not lesser than 32. It is 5000000 by default. |
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@item packetsize @var{integer} (@emph{output}) |
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Set packet size. |
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@item fflags @var{flags} (@emph{input/output}) |
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Set format flags. |
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Possible values: |
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@table @samp |
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@item ignidx |
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Ignore index. |
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@item genpts |
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Generate PTS. |
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@item nofillin |
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Do not fill in missing values that can be exactly calculated. |
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@item noparse |
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Disable AVParsers, this needs @code{+nofillin} too. |
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@item igndts |
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Ignore DTS. |
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@item discardcorrupt |
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Discard corrupted frames. |
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@item sortdts |
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Try to interleave output packets by DTS. |
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@item keepside |
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Do not merge side data. |
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@item latm |
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Enable RTP MP4A-LATM payload. |
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@item nobuffer |
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Reduce the latency introduced by optional buffering |
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@end table |
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@item analyzeduration @var{integer} (@emph{input}) |
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Specify how many microseconds are analyzed to probe the input. A |
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higher value will allow to detect more accurate information, but will |
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increase latency. It defaults to 5,000,000 microseconds = 5 seconds. |
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@item cryptokey @var{hexadecimal string} (@emph{input}) |
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Set decryption key. |
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@item indexmem @var{integer} (@emph{input}) |
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Set max memory used for timestamp index (per stream). |
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@item rtbufsize @var{integer} (@emph{input}) |
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Set max memory used for buffering real-time frames. |
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@item fdebug @var{flags} (@emph{input/output}) |
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Print specific debug info. |
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Possible values: |
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@table @samp |
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@item ts |
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@end table |
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@item max_delay @var{integer} (@emph{input/output}) |
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Set maximum muxing or demuxing delay in microseconds. |
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@item fpsprobesize @var{integer} (@emph{input}) |
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Set number of frames used to probe fps. |
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@item audio_preload @var{integer} (@emph{output}) |
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Set microseconds by which audio packets should be interleaved earlier. |
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@item chunk_duration @var{integer} (@emph{output}) |
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Set microseconds for each chunk. |
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@item chunk_size @var{integer} (@emph{output}) |
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Set size in bytes for each chunk. |
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@item err_detect, f_err_detect @var{flags} (@emph{input}) |
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Set error detection flags. @code{f_err_detect} is deprecated and |
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should be used only via the @command{ffmpeg} tool. |
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Possible values: |
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@table @samp |
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@item crccheck |
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Verify embedded CRCs. |
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@item bitstream |
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Detect bitstream specification deviations. |
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@item buffer |
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Detect improper bitstream length. |
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@item explode |
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Abort decoding on minor error detection. |
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@item careful |
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Consider things that violate the spec and have not been seen in the |
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wild as errors. |
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@item compliant |
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Consider all spec non compliancies as errors. |
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@item aggressive |
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Consider things that a sane encoder should not do as an error. |
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@end table |
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@item use_wallclock_as_timestamps @var{integer} (@emph{input}) |
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Use wallclock as timestamps. |
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@item avoid_negative_ts @var{integer} (@emph{output}) |
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Shift timestamps to make them positive. A value of 1 enables shifting, |
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a value of 0 disables it, the default value of -1 enables shifting |
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when required by the target format. |
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When shifting is enabled, all output timestamps are shifted by the |
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same amount. Audio, video, and subtitles desynching and relative |
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timestamp differences are preserved compared to how they would have |
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been without shifting. |
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Also note that this affects only leading negative timestamps, and not |
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non-monotonic negative timestamps. |
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@item flush_packets @var{integer} (@emph{output}) |
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Flush the underlying I/O stream after each packet. Default 1 enables it, and |
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has the effect of reducing the latency; 0 disables it and may slightly |
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increase performance in some cases. |
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@end table |
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@c man end FORMAT OPTIONS |
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@include demuxers.texi |
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@include muxers.texi |
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@include metadata.texi |
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