[PD] Gem / [pix_movie] trouble: "no movie decoding backends found"

[IOhannes m zmoelnig]

On 12.02.19 19:47, Orm Finnendahl wrote:
> 
>> you should make sure that gmerlin is working though. it replaces
>> practically the rest.
> 
> Thanks for the hint! I got gmerlin installed, but that was a little
> involved as although there is a package gmerlin in AUR it doesn't
> contain the gmerlin_avdecoders which seem to be a/the central part
> needed for Gem.

indeed.
i have to admit that i mostly use gmerlin and gmerlin_avdecoders
synonymously (the latter being such a long word).

> 
> With the gmerlin svn checkout from sourceforge gavl and
> gmerlin_avdecoders compile and Gem recognizes it in its ./configure
> step, but compiling Gem fails at the GMERLIN related step (see output
> below).
> 
> Any ideas, what could be the reason for this?

the reason is pretty simple: gmerlin_avdecoders has had a release a
couple of years ago. Gem is compatible with this release.
gmerlin's upstream keeps hacking a bit on their libraries, but last time
i've asked they had no intentions to do a proper release.
unfortunately, in the meantime they have broken the API.

this basically means: Gem cannot be compiled against gmerlin_avdecoder
from the gmerlin SVN repository.

you should use the last gmerlin_avdecoders release.

this - of course - comes with another problem, because
germlin_avdecoders internally uses ffmpeg, which has also broken API
since the release of gmerlin (ffmpeg breaking API is the main reason,
why Gem doesn't have a native ffmpeg backend), but ffmpeg did a number
of releases since then.
so you cannot compile the last release of gmerlin_avdecoders with the
last release of ffmpeg.

the reason it works for me is, that Debian patches gmerlin_avdecoders to
support recent ffmpeg versions (Debian/buster ships ffmpeg-4.1).

i don't know about the arch ecosystem, but if you can apply patches
during build, then see [1] for inspiration.


fgamsdr
IOhannes

[1]
https://salsa.debian.org/multimedia-team/gmerlin-avdecoder/tree/master/debian/patches

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