[PD] pix_film + incrementing frame number = blurring

IOhannes m zmoelnig zmoelnig at iem.at
Tue Jul 3 19:13:24 CEST 2012

Hash: SHA1

On 2012-07-03 18:36, Iain Mott wrote:
> On Tue, 2012-07-03 at 09:15 +0200, IOhannes m zmoelnig wrote:
>> Gem is 20fps you will play the file at a reduced speed. the
>> simplest solution is to raise Gem's framerate.
>> as others have pointed out, the "blurring" will most likely come
>> from inter-frame compression where you are trying to access
>> non-keyframes and the used backend (most likely gmerlin,
>> according to your settings) does a bad job at reconstructing the
>> image.
> Thanks IOhannes, I didn't know about the 20fps default. If gmerlin
> does a poor job, how can enlist the services of a better backend?
> Is this a matter of using a different codec or do I have to
> recompile with certain config options?

i'm not saying that gmerlin _is_ doing a bad job.
afaik, it does the best job _in general_ (supports most formats,
allows to access  random-access, ...)
whether it does a bad job in the specific case i cannot really tell,
but it seems so.

anyhow, you can select a different backend using yet another parameter
to the "open" message:
[open foo.mov RGBA quicktime4linux(
should open "foo.mov" in the RGBA-space using "quicktime4linux"
(rather than gmerlin).

afair, the backend is merely a suggestion, and if the desired backend
is not able to open the given file, it will fallback to the default

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