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These options are shared amongst the av* tools. Otherwise matches all streams in this program. If stream_index is given, then matches stream number stream_index in program with id program_id. Otherwise matches all streams of this type. If stream_index is given, then matches stream number stream_index of this type. Stream_type is one of: ’v’ for video, ’a’ for audio, ’s’ for subtitle, ’d’ for data and ’t’ for attachments. threads:1 4 would set the thread count for the second stream to 4. the stream specifier in -b:a 128k matches all audio streams.Īn empty stream specifier matches all streams, for example -codec copy or -codec: copy would copy all the streams without reencoding. Therefore it would select the ac3 codec for the second audio stream.Ī stream specifier can match several stream, the option is then applied to all of them. codec:a:1 ac3 option contains a:1 stream specifer, which matches the second audio stream. Stream specifiers are used to precisely specify which stream(s) does a given option belong to.Ī stream specifier is a string generally appended to the option name and separated from it by a colon. Some options are applied per-stream, e.g.
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They can be set to false by prefixing with "no" the option name, for example using "-nofoo" in the commandline will set to false the boolean option with name "foo". Options which do not take arguments are boolean options, and set the corresponding value to true. This allows using for example ’KB’, ’MiB’, ’G’ and ’B’ as postfix.
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The ’B’ postfix multiplies the value for 8, and can be appended after another postfix or used alone. If ’i’ is appended after the postfix, powers of 2 are used instead of powers of 10. OptionsĪll the numerical options, if not specified otherwise, accept in input a string representing a number, which may contain one of the International System number postfixes, for example ’K’, ’M’, ’G’.
Project magenta 1280x720 manual#
For full manual control, use the -map option, which disables the defaults just described. You can disable some of those defaults by using -vn/-an/-sn options.
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In the case where several streams of the same type rate equally, the lowest numbered stream is chosen. It picks the "best" of each based upon the following criteria for video it is the stream with the highest resolution, for audio the stream with the most channels, for subtitle it’s the first subtitle stream. Stream selectionīy default ffmpeg includes only one stream of each type (video, audio, subtitle) present in the input files and adds them to each output file. The format option may be needed for raw input files. To force the frame rate of the input file (valid for raw formats only) to 1 fps and the frame rate of the output file to 24 fps:įfmpeg -r 1 -i input.m2v -r 24 output.avi.To force the frame rate of the output file to 24 fps:.To set the video bitrate of the output file to 64kbit/s:.verbosity level), which should be specified first. Exceptions from this rule are the global options (e.g. Each occurrence is then applied to the next input or output file. Therefore, order is important, and you can have the same option on the command line multiple times. It can also convert between arbitrary sample rates and resize video on the fly with a high quality polyphase filter.Īs a general rule, options are applied to the next specified file. 17.11 rtmp, rtmpe, rtmps, rtmpt, rtmpteįfmpeg ].įfmpeg is a very fast video and audio converter that can also grab from a live audio/video source.11.1.4 Floating-Point-Only AC-3 Encoding Options.11.1.2.2 Extended Bitstream Information - Part 2.11.1.2.1 Extended Bitstream Information - Part 1.6.3 Video and Audio file format conversion.