filter_complex_threads nb_threads ( global)ĭefines how many threads are used to process a filter_complex graph. To generate 5 seconds of pure red video using lavfi color source: ffmpeg -filter_complex 'color=c=red' -t 5 out.mkv (0x2d0, 0x2dc and 0x2ef are the MPEG-TS PIDs of respectively the video, audio and subtitles streams 0:0, 0:3 and 0:7 would have worked too) It will be removed once libavfilter has proper support for subtitles.įor example, to hardcode subtitles on top of a DVB-T recording stored in MPEG-TS format, delaying the subtitles by 1 second: ffmpeg -i input.ts -filter_complex \ Note that this is an experimental and temporary solution. Similarly the first video stream in the second input is linked to the second (overlay) input of overlay.Īssuming there is only one video stream in each input file, we can omit input labels, so the above is equivalent to ffmpeg -i video.mkv -i image.png -filter_complex 'overlay' -mapįurthermore 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 ffmpeg -i video.mkv -i image.png -filter_complex 'overlay' out.mkvĪs 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 720×576 if no video is present. Here refers to the first video stream in the first input file, which is linked to the first (main) input of the overlay filter. Note that with this option it is possible to use only lavfi sources without normal input files.įor example, to overlay an image over video ffmpeg -i video.mkv -i image.png -filter_complex 'overlay' -map Unlabeled outputs are added to the first output file. Output link labels are referred to with -map. An unlabeled input will be connected to the first unused input stream of the matching type.
If stream_specifiermatches multiple streams, the first one will be used. Input link labels must refer to input streams using the syntax (i.e. filtergraph is a description of the filtergraph, as described in the “Filtergraph syntax” section of the ffmpeg-filters manual. For simple graphs – those with one input and one output of the same type – see the -filter options. one with arbitrary number of inputs and/or outputs. ffmpeg -i input.mpg -timecode 01:02:03.04 -r 30000/1001 -s ntsc output.mpgĭefine a complex filtergraph, i.e. SEP is ’:’ for non drop timecode and ’ ’ (or ’.’) for drop. tag codec_tag ( input/output,per-stream)įorce a tag/fourcc for matching streams.-timecode hh: mm: ssSEP ff ffmpeg -i h264.mp4 -c:v copy -bsf:v h264_mp4toannexb -an out.h264įfmpeg -i file.mov -an -vn -bsf:s mov2textsub -c:s copy -f rawvideo sub.txt Use the -bsfs option to get the list of bitstream filters. bitstream_filters is a comma-separated list of bitstream filters. Set bitstream filters for matching streams. bsf bitstream_filters ( output,per-stream) For the situation where multiple output files exist, a streamid may be reassigned to a different value.įor example, to set the stream 0 PID to 33 and the stream 1 PID to 36 for an output mpegts file: ffmpeg -i inurl -streamid 0:33 -streamid 1:36 out.ts This option should be specified prior to the output filename to which it applies. Set the initial demux-decode delay.-streamid output-stream-index: new-value ( output)Īssign a new stream-id value to an output stream. Set the maximum demux-decode delay.-muxpreload seconds ( output) This threshold use to discard crazy/damaged timestamps and the default is 30 hours which is arbitrarily picked and quite conservative.-muxdelay seconds ( output) Timestamp discontinuity delta threshold.-dts_error_threshold seconds
0.04166, 2.0833e-5)ĭefault value is 0.-bitexact ( input/output)Įnable bitexact mode for (de)muxer and (de/en)coder-shortest ( output)įinish encoding when the shortest input stream ends.-dts_delta_threshold 1:24, 1:48000) or as a floating point number (e.g. This field can be provided as a ratio of two integers (e.g.
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