[FFmpeg-devel] [PATCH 01/10] avformat/hls: fix repeated requests for media init section

["zhilizhao(赵志立)"]

> On Apr 12, 2022, at 9:26 PM, zhilizhao(赵志立) <quinkblack at foxmail.com> wrote:
> 
> 
> 
>> On Apr 12, 2022, at 7:45 PM, mypopy at gmail.com wrote:
>> 
>> On Tue, Apr 12, 2022 at 4:15 PM Zhao Zhili <quinkblack at foxmail.com> wrote:
>>> 
>>> ---
>>> libavformat/hls.c | 59 ++++++++++++++++++++++++++++++++---------------
>>> 1 file changed, 40 insertions(+), 19 deletions(-)
>>> 
>> Can these patches handle multiple instances of the media init sections?
> 
> Before and after the patch, struct playlist do take multiple media
> initialization sections into consideration. However, I think it doesn’t
> work for HLS as a whole. To support multiple media init sections, it
> needs to handle EXT-X-DISCONTINUITY and recreate mp4 demuxer.
> 
> So even if new media init section is show up, it will be downloaded and
> then dropped by mp4 muxer:

I mean mp4 demuxer.

> ```
>    if (c->found_moov) {
>        av_log(c->fc, AV_LOG_WARNING, "Found duplicated MOOV Atom. Skipped it\n");
>        avio_skip(pb, atom.size);
>        return 0;
>    }
> ```
> 
> What the patch does is to avoid downloading the same init sections again
> and again, and then dropped by mp4 muxer. It’s common to have init section
> repeat in live mode.

Ditto.

> 
> Just for reference, hls.js had the same issue, and have been fixed by
> 
> https://github.com/video-dev/hls.js/pull/4452
> 
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