#2828: HLS segment MPEGTS continuity counter is being incorrectly set to 0 on
each
segment
-------------------------------------+------------------------------------
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 trnsz):
Interesting, according to a W3C document at https://dvcs.w3.org/hg/html-
media/raw-file/d5956e93b991/media-source/media-source.html#mpeg2ts-
discontinuities it is stated that clients should handle TS
discontinuities:
{{{• When a discontinuity is detected, MPEG2TS_timestampOffset must be
adjusted to make the timestamps after the discontinuity appear to come
immediately after the timestamps before the discontinuity.}}}
However, the Apple documentation for the validation tool at
https://developer.apple.com/library/ios/technotes/tn2235/_index.html#//apple_ref/doc/uid/DTS40010221
specifies:
{{{
WARNING: stream discontinuity detected
You must use the EXT-X-DISCONTINUITY tag where an encoding discontinuity
exists between the
media file that follows it and the one that preceded it. See the IETF
Internet Draft of the
HTTP Live Streaming Protocol Specification for more information.
If you intend to play a new stream at a given point in your presentation,
you must use the
EXT-X-DISCONTINUITY tag.
}}}
So a workaround that would be a quick hackish would might be to change the
M3U8 output to include the EXT-X-DISCONTINUITY tag between all segments
and should result in ffmpeg output passing the Apple validation tests.
The proper fix is still maintaining the timestamp across segments.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/2828#comment:17>
FFmpeg <https://ffmpeg.org>
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