[Kdenlive-devel] small feature suggestion regarding crossfade transition

[Stephane Fillod]

Sat, Mar 31, 2007 at 02:11:52PM +0200, Florian Cramer skribis:
[..]
> We have one bug that consistently affects kdenlive (0.4 + 0.5svn) when
> it is used on PowerPC-Macs (Powerbook and Mac Mini, both with 7400/G4
> CPUs and Radeon 9200 chipsets) running Linux (Gentoo).  This bug does
> neither appears on a P4 machine running Gentoo, nor on a Thinkpad with
> the same Radeon 9200 chipset running Debian, so it seems
> PowerMac-related:

In fact, this is most likely not only PowerMac-related but big-endian related.

> When playing back video in kdenlive (both clip and timeline), all colors
> are falisified, turning into purple and green. When the video is paused,
> or the cursor is manually moved in the video, this problem does not occur
> and colors remain correct.  It seems to me as if kdenlive switches from
> non-accelerated to xv-/hardware-accelerated video when playback is
> started?! Yet other xv-accelerated video players (mplayer, vlc,
> xine, ffplay) work fine on the same machines. 
> 
> I get exactly the same bug, on the same PPC Mac hardware running any
> flavor of Linux when using the kaffeine media player with deinterlacing
> at the setting "high CPU usage, good quality" or better (not at "medium
> CPU usage" or lower). kaffeine uses a "tvtime plugin" for deinterlacing.
> Could this possibly also be the culprit in kdenlive? 

What is the source format type you're using in kdenlive? Is it a format
that needs deinterlacing?
If you're experiencing the same color symptoms in kaffeine, it can
originate from the deinterlacing code, which IIRC was borrowed from xine
at some time for MLT, or maybe an external library kdenlive and kaffeine
have in common.

Another question, do you experience the problem in the rendered video
file?

-- 
Stephane