[FFmpeg-devel] [PATCH] hlsenc: intialize only on ref_pkt (v2)

[Steven Liu]

2017-02-14 16:30 GMT+08:00 Miroslav Slugeň <thunder.m at email.cz>:

> Dne 14.2.2017 v 04:59 Steven Liu napsal(a):
>
> 2017-02-13 21:15 GMT+08:00 Miroslav Slugeň <thunder.m at email.cz>:
>>
>> This patch will fix cutting hls segments into exactly same length. Because
>>> it will intialize only on first ref_packet, which is video frame, not
>>> audio
>>> frame (old behavior)
>>>
>>> Now it should be possible to create segments at exactly same length if we
>>> use new -force_key_frames hls:time_in_seconds parameter.
>>>
>>> This is required to support adaptive HLS.
>>>
>>> This patch was splitted to two parts, this is first independent part
>>>
>>> --
>>> Miroslav Slugeň
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> _______________________________________________
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>>>
>>>
>>> Patch can compile passed, but i cannot reproduce the problem before your
>> patch, can you send a reproduce step and test file?
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>>
> I can provide you with sample. But this explanation should be enough:
>
> When you use -copyts for long time audio/video sync when transcoding from
> MPEGTS stream, audio comes always sooner than video (it is around 1-2 s),
> so hlsenc is initialized with audio packet PTS instead of video packet PTS.
> That is not correct if you wan't to have all segments with same length
> -forced_keyframes to force keyframe at video position. Every other
> calculations of hls_time is done only on ref_packets which is video. This
> scenario is problematic when encoder is also inserting keyframes by its own
> decision (libx264 default behavior).

command line please!

>
>
> M.
>
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