trace ffmpeg -i inputfile流程

[John ffmpeg_parse_options() 3249]
[John open_input_file() 992]
[John avformat_open_input() 515]
[John avformat_open_input() 603] s 0x35207c0 s->iformat->read_header 0x69c350
[John mpegts_read_header() 2615] mpegts_read_header =  0x69c350, s 0x35207c0
[John avformat_open_input() 646] nb_streams 3

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利用ffmpeg取出ts流中特定的program

https://trac.ffmpeg.org/wiki/Map Example 8 MPEG stream selection: The tricky part with selecting from MPEG TS is it may contain multiple streams/channels, and if you are receiving "live data" just specifying an index might not work because it can change from run to run, so ffmpeg -i INPUT -map 0:6 OUTPUT # might not work the same every run, DO NOT USE THIS WAY! Assuming your file is MPEG, you can run "ffmpeg -i INPUT" (not specify an output) to see what program id's and stream id's it contains, like this example (probesize and analyzeduration specified to help "make sure" it picks up all the streams in it, may not be always needed) $ ffmpeg -probesize 50M -analyzeduration 50M -i INPUT ... Input #0, mpegts, from 'INPUT': Duration: N/A, start: 22159.226833, bitrate: N/A Program 1344 Metadata: service_name : 7 Digital service_provider: Seven Network Stream #0:0[0x401]: Video: mpeg2video (Main) ([2][0][0...
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