[PD] pix_film + incrementing frame number = blurring

IOhannes m zmoelnig zmoelnig at iem.at
Tue Jul 3 09:15:34 CEST 2012

Hash: SHA1

On 2012-07-02 23:19, Iain Mott wrote:
> Forgot to mention i'm using Ubuntu 11.10 and the video files are 30
> fps with the codec H.264 / AVC
> Also, while sending an "auto 1" message to pix_film gives smooth 
> playback, the file plays perhaps 30% slow. This doesn't seem to be
> a CPU issue as the cpu is running between 20 and 30% while playing
> the file.

in "auto 1" mode, Gem will increment to the "next" frame in each
render tick. "next" means that #125 will follow #124 regardless of the
actual fps of the video.
since your video is encoded with 30fps and the default tick-time in
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.

Version: GnuPG v1.4.12 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/


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