#6915: DASH audio segments duration doesn't match exactly with video segments
duration.
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Reporter: beloko | Owner:
Type: defect | Status: new
Priority: normal | Component: avformat
Version: git-master | Resolution:
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by stevenliu):
Replying to [comment:7 j_karthic]:
> Well, if we round the target duration to '''nearest integer''' as per
the spec, part of the problem is resolved. Right now we are '''ceiling to
the upper integer''' which is not according to HLS specifications.
>
> {{{
> 4.3.3.1. EXT-X-TARGETDURATION
>
> The EXT-X-TARGETDURATION tag specifies the maximum Media Segment
> duration. The EXTINF duration of each Media Segment in the Playlist
> file, when rounded to the nearest integer, MUST be less than or equal
> to the target duration; longer segments can trigger playback stalls
> or other errors. It applies to the entire Playlist file. Its format
> is:
>
> #EXT-X-TARGETDURATION:<s>
>
> where s is a decimal-integer indicating the target duration in
> seconds. The EXT-X-TARGETDURATION tag is REQUIRED.
>
> }}}
>
> So as per the spec, the EXT-X-TARGETDURATION should rounded to 4 instead
of 5.
>
> But when I submitted a patch for fixing such an issue in hlsenc, it was
rejected by Steven. See thread http://ffmpeg.org/pipermail/ffmpeg-
devel/2017-September/215630.html more details. During that time, I was not
able to provide a concrete example with mediastreamvalidator like @beloko
has done now. But I thought the spec was very clear about it without any
room for confusion.
>
> @stevenliu
> If you have a change of mind after seeing these results, please let me
know. Maybe I will send a new patch which fixes the target duration in
dashenc, and we can take forward our discussions there.
The spec said "EXT-X-TARGETDURATION must > EXTINF", we have talk and you
have sent twice patch about it. you can see the spec said "MUST be less
than or equal to the target duration.", attention the MUST, MUST, MUST, we
should don't care the tool, we should care the spec. If the tool different
with the spec, that maybe apple's mistake, you should push apple.
>
>
>
>
>
--
Ticket URL: <https://trac.ffmpeg.org/ticket/6915#comment:8>
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