[FFmpeg-devel] [PATCH] avformat/hls: add supporting EXT-X-DISCONTINUITY tag

[Philip Langdale]

On Sat, 18 Jul 2020 20:29:01 +0300
Aleksey Skripka <caspy at undev.ru> wrote:

> Greetings!
> 
> unconditional AVFMT_TS_DISCONT also helps to survive when pts
> rollover in mpegts occurs. seems like this patch will break again
> reading long-lasting hls.
> 

Right.

The flag on the InputFormat says the format _might_ have
discontinuities. The EXT-X-DISCONTINUITY tag shows up in the hls m3u8
each time there actually is a discontinuity.

And this is the part where I complain about how hard the hls demuxer
makes it to propagate discontinuities correctly. It concatenates the
fragments and then passes them on to the mpegts demuxer. This means you
lose the discontinuity information and you can't easily translate it
into an mpegts marker because we don't work at the packet level. *sigh*


--phil