Hi
I'm using mplayer on a SuperH platform with the sh_veu vidix driver, which
takes nv12 as an input format. It used to work at least with a version
from August 2008, a recent (21.07) SVN snapshot doesn't work any more.
Doesn't work means, that with the clean SVN version the image appears
black-and-white on the LCD. Tested by playing back per
mplayer -vo fbdev:vidix:sh_veu stream.yuv
a yv12 encoded video file, recorded from a camera per
mplayer tv:// -tv \
driver=v4l2:width=320:height=240:device=/dev/video0:outfmt=bgr16 \
-vo yuv4mpeg -frames 100
The file is fine, as verified by playing it back without the vidix driver.
The vidix driver is also working, as verified by capturing video from the
camera in nv12 directly to the vidix driver. Notice, that to do this you
have to use a modified codecs.conf file to bypass the hmblck decoder,
which is normally assigned to handle nv12, and using the raw driver
instead.
I traced the problem down to the swscaler and there to the planarCopy()
function. At least a part of the problem lies in this line:
// ignore palette for GRAY8
if (plane == 1 && !dst[2]) continue;
which disables processing of the UV plane completely. Verified by
instrumenting the code and dumping actual data. But even removing this
line doesn't fix the problem completely. I can see that the data gets
written to the destination buffer, but it only produces some "random"
colour spots.
Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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