[FFmpeg-trac] #2828(avformat:new): HLS segment MPEGTS continuity counter is being incorrectly set to 0 on each segment

[FFmpeg]

#2828: HLS segment MPEGTS continuity counter is being incorrectly set to 0 on each
segment
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             Reporter:  dlevinson5   |                     Type:  defect
               Status:  new          |                 Priority:  critical
            Component:  avformat     |                  Version:
             Keywords:  HLS MPEGTS   |  unspecified
             Blocking:               |               Blocked By:
Analyzed by developer:  1            |  Reproduced by developer:  1
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 Summary of the bug:

 when creating hls segments using ffmpeg the continuity counter is being
 reset to 0 for each segment instead of continuing from the prior segment.

 This is somewhat critical since this breaks the MPEG2 specification and
 does not pass Apple's HLS compliance requirements.

 In the mpegts_write_header() function the pat, sdt and st_ts->cc counters
 are reset when the segment is written instead of being carried forward
 from the prior segment.

 To work around this issue I created several static variables to persist
 the continuity counters and added a flag to switch between preserving
 continuity or using the default logic.

 static int mpegts_pat = 15;
 static int mpegts_sdt = 15;
 static int mpegts_cc[10] = {15,15,15,15,15,15,15};

 How to reproduce:
 {{{

 %ffmpeg -i <source> -c copy -map 0 -vbsf h264_mp4toannexb -initial_offset
 10 -segment_list_type m3u8 -flags +global_header -f segment
 -segment_list_flags +live -segment_list_type m3u8 -segment_list
 \"{1}.m3u8\" -segment_time 10 -segment_format mpegts <output>_%d.ts

 Inspect each segment continuity counter values in sequence and it will be
 observed that the continuity counter is reset to 0 at the start of each
 segment.

 ffmpeg version v2.0 /  N-54901-g55db06a / Win32/64

 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2828>
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