#5023: Can no longer read mjpeg from Mobotix camera
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Reporter: hackeron | Owner:
Type: defect | Status: reopened
Priority: important | Component: avformat
Version: git-master | Resolution:
Keywords: mjpeg | Blocked By:
mpjpeg regression |
Blocking: | Reproduced by developer: 1
Analyzed by developer: 0 |
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Comment (by cehoyos):
Replying to [comment:48 barsnick]:
> Replying to [comment:47 smbz]:
> > There is a call to ffio_ensure_seekback() which looks like it's meant
to ensure that it is always possible to seek back by this amount, but from
what I can tell this will work only at the beginning of the stream (i.e.
for probing or headers) and not mid-stream. Is anyone able to confirm
that?
>
> My take is that {{{ffio_ensure_seekback(s->pb, read_chunk)}}}, where
it's currently placed, only makes sure that the first chunk is rewindable.
This needs to be done for every subsequent chunk fetch as well. I dropped
(or rather moved) that line and instead changed the while condition:
> {{{
> while ((ret = ffio_ensure_seekback(s->pb, read_chunk -
remaining) >= 0) && (ret = av_append_packet(s->pb, pkt, read_chunk -
remaining)) >= 0) {
> }}}
>
> And suddenly, decoding the stream works perfectly (at least as far as I
expect from any mpjpeg stream).
This change also fixes ticket #5921.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/5023#comment:49>
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