[FFmpeg-user] ffmpeg retry failed segments

[Stein Rune Risa]

Hi!

This is a very stable and well known source, so the network is also stable.
There are never any issues streaming through their official player.

I also see that the streams are delivered through well known CDN - so it
should be fine.

But I will try the xerror option. It is better to detect errors than
getting some problem with the file.

It also seems that the hiccup always happens within the first 5 seconds of
the stream - so there might be some "initial delay" when initializing the
stream. Is there some parameter for ffmpeg to kind of allow longer response
times from the source?



On Wed, Sep 27, 2023 at 8:16 AM Torsten Kaiser <info at linux-rebellen.de>
wrote:

> Looks like you download a known playlist from some unstable network
> connection.
>
> To get a grasp on this: If you set the -xerror switch like
>
> ffmpeg -y -xerror -i https://file.com/myfiles.m3u8 -c copy /tmp/test.mkv
>
> what happens? Download should stop at the first buggy/missing segment of
> the playlist. Now repeat the download multiple times to see if the
> problem is random or not.
>
> Missing segments could be a DRM problem or invalid/outdated entries in
> the playlist. If the download always misses the same segment it's most
> likely the segment entry is invalid.
>
> Buggy segments are most likely either already buggy in the source or a
> network bottleneck. If the faults always occur on the same spot, then
> the source itself is most likely already buggy. Encountered this myself
> on legacy sources digitized from VHS tapes. Sometimes content is more
> important than quality.
>
>
> On 26.09.23 22:36, Stein Rune Risa wrote:
> > I am using ffmpeg to download some streaming to a mkv file. The stream
> > parts comes in a m3u8 file.
> >
> > ffmpeg -y -i https://file.com/myfiles.m3u8 -c copy /tmp/test.mkv
> >
> > In some cases, there have been some issues downloading some of the
> > segments, and the mkv files have parts where it freezes for some seconds
> > before continuing. I am now forced to check the file manually (by
> watching)
> > and then redownload if it has any issues.
> >
> > I guess this happens because ffmpeg temporarily is not able to download
> > some of the segments referred to in the m3u8?
> >
> > Is there some way that I can force ffmpeg to retry failed segments? Or at
> > least abort if it happens? I am kind of looking for a way to get rid of
> the
> > manual checking of the content.
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