#2828: HLS segment MPEGTS continuity counter is being incorrectly set to 0 on
each
segment
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Reporter: dlevinson5 | Owner:
Type: defect | Status: new
Priority: normal | Component: avformat
Version: unspecified | Resolution:
Keywords: hls mpegts | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by lancey):
Well, as I said these counters need to be moved to some structure related
to the output, which is kept across segments, so there are copies per
output.
You can reproduce the issue with the following command:
ffmpeg -i test.ts -codec copy -flags global_header -map 0 -f segment
-segment_time 10 -segment_list_size 6 -segment_wrap 20 -segment_list
playlist.m3u8 pl%03d.ts
This will output one ts file per 10 sec. Inspecting each ts file you'll
see CC counters for each PID start from 0, instead of the appropriate
number which the last PID packet had within the previous segment. I've
personally not encountered a scenario where this breaks playout on any
device/player, but some people do. Also, playling the result with VLC
gives warnings as well (but no playout disturbances occur). Per HLS specs,
counters should indeed be kept across segments, so we should fix this for
sure.
Also, it would be even better if we keep the incoming CCs in case we are
copying the stream.
If you need example files, both input and output, let me know.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/2828#comment:21>
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