Bug#863663: libgstreamer1.0-0: plays MJPEG AVI files (and possibly other formats) at degraded quality

Francesco Poli invernomuto at paranoici.org
Tue Jun 27 21:34:08 UTC 2017

On Tue, 27 Jun 2017 10:34:54 +0900 Yasushi SHOJI wrote:

> Hi,

Hello, thanks for your reply.

> On Sun, Jun 25, 2017 at 2:50 AM, Francesco Poli <invernomuto at paranoici.org>
> wrote:
> >
> > On Wed, 21 Jun 2017 21:52:43 +0200 Francesco Poli wrote:
> >
> > [...]
> > > At this point I really cannot understand what's going on and why all my
> > > attempts are failing...   :-(
> >
> > Could someone please shed some light on this mystery?
> I might be misunderstanding but the following pipeline seems to work
> here without any
> ranking change on my Debian Sid.
> $ gst-launch-1.0 -v filesrc location=wave_anim.avi ! avidemux ! jpegparse !
> avdec_mjpeg ! videoconvert ! autovideosink

That's clear: the gst-launch-1.0 command line able to correctly play
the AVI file has already been suggested.

The problem here is: how can I modify an application (written in Vala)
that uses the GStreamer library to use avdec_mjpeg for MJPEG AVI files.

The attempts to modify the ranks were intended to guide the GStreamer
library in the automatic decoder selection process, so that it would
select avdec_mjpeg for MJPEG AVI files.

But, for some mysterious reason, all those attempts seem to fail

Is there any alternative approach?

P.S.: Please Cc me, as well as the Debian bug address and the
gstreamer-devel mailing list. Thanks for your understanding!

 There's not a second to spare! To the laboratory!
..................................................... Francesco Poli .
 GnuPG key fpr == CA01 1147 9CD2 EFDF FB82  3925 3E1C 27E1 1F69 BFFE
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