[MPlayer-users] BUG: theora codec and bmovl filter

[Giorgio]

Yes, it seems like the Theora codec works better when the video width
and height multiples of 16. There is a very interesting book about
theora at:

http://en.flossmanuals.net/theoracookbook

In this page http://en.flossmanuals.net/TheoraCookbook/EncodingIntro it says:

"Sometimes video source material does not make use of the full video
frames, leaving black borders around the video. It is a good idea to
remove black or otherwise unused parts from the video as this usually
improves the quality and file size of the encoded Theora file. If
possible, try to keep video width and height multiples of 16. The
Theora format is capable of, but not very efficient at, storing video
using other arbitrary frame sizes."

But anyway, as stated in http://wiki.xiph.org/Theora, it should be
able to work fine with all dimensions:

"Features available in the Theora format (and a comparison to VP3 and
MPEG-4 ASP):
...
- non-multiple of 16 picture sizes (as possible in ASP, but not in VP3)
...
"


2009/10/5 Michael <auslands-kv at gmx.de>:
> Reimar Döffinger wrote:
>
>> On Mon, Oct 05, 2009 at 11:31:05AM +0200, Michael wrote:
>>> I have a strange bug here. It only occurs if mplayer displays a theora
>>> video and the bmovl filter is used. In this case the first eigth(?) lines
>>> of the video show a greenish color.
>>
>> Is the resolution of your video maybe not a multiple of 8?
>> AFAIK theora encodes videos upside-down, might be that bmov has an issue
>> with that.
>
> Thanks, this was a good hint!
>
> Actually, there are no problems, if the video size is a multiple of 16!
>
> If I encode the videos in 720x400 it works also with the bmovl filter.
>
> Michael
>
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