#9510: HLS with fMP4 produces invalid segments
-------------------------------------+-------------------------------------
Reporter: Andreas | Owner: (none)
Unterweger |
Type: defect | Status: new
Priority: normal | Component: avformat
Version: git-master | Resolution:
Keywords: HLS hls | Blocked By:
CHUNK ffmpeg |
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Description changed by Andreas Unterweger:
Old description:
> Using fMP4 segments with strftime and hls_init_time produces segments
> which are too short and cannot be played back.
>
> Example call:
>
> {{{
> ./ffmpeg -y -i timer_1M.mp4 -acodec aac -b:a 64k -vcodec h264 -b:v 1M -f
> hls -hls_segment_type fmp4 -strftime 1 -hls_segment_filename '%%18d.m4s'
> -hls_flags second_level_segment_index+split_by_time -hls_time 0.6
> -hls_init_time 0.600001 index.m3u8
> }}}
>
> This produces a segment 000000000000000006.m4s which is only about a
> tenth of the size of the other segments. Running FFprobe on it, it seems
> to contain only audio, but no video frames.
>
> Removing the hls_init_time parameter from the command "resolves" the
> issue, i.e., the segments are then split correctly and have video frames.
New description:
Using fMP4 segments with strftime and hls_init_time produces segments
which are too short and cannot be played back.
Example call:
{{{
./ffmpeg -y -i timer_1M.mp4 -acodec aac -b:a 64k -vcodec h264 -b:v 1M -f
hls -hls_segment_type fmp4 -strftime 1 -hls_segment_filename '%%18d.m4s'
-hls_flags second_level_segment_index+split_by_time -hls_time 0.6
-hls_init_time 0.600001 index.m3u8
}}}
This produces a segment 000000000000000006.m4s which is only about a tenth
of the size of the other segments. Running FFprobe on it (by creating a
dummy playlist with only this segment), it seems to contain only audio,
but no video frames.
Removing the hls_init_time parameter from the command "resolves" the
issue, i.e., the segments are then split correctly and have video frames.
--
--
Ticket URL: <https://trac.ffmpeg.org/ticket/9510#comment:1>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker_______________________________________________
FFmpeg-trac mailing list
[email protected]
https://ffmpeg.org/mailman/listinfo/ffmpeg-trac
To unsubscribe, visit link above, or email
[email protected] with subject "unsubscribe".
