[FFmpeg-user] vertical lines noise in scaled raw video.

[Dennis]

On Wed, Nov 9, 2011 at 1:52 PM, Dennis <mediastream at gmail.com> wrote:

>
>
> On Wed, Nov 9, 2011 at 12:47 PM, Carl Eugen Hoyos <cehoyos at ag.or.at>wrote:
>
>> Dennis <mediastream <at> gmail.com> writes:
>>
>> > Here's the screenshot with "find edges" filter applied by ImageJ :
>> > http://www.mediafire.com/?0hesdf21e6a2ok2
>>
>> I can see the artefacts now (don't know why I searched for "red" lines).
>> Do you think they are in the original video and amplified by the encoding
>> (and
>> you are searching for a filter that suppresses them), or is FFmpeg
>> producing
>> them (which may be a serious bug)?
>>
>> Carl Eugen_______________________________________________
>>
>
> well, look at the un-scaled y4m output screenshot here:
> http://www.mediafire.com/i/?5m3seip1z8zb4mf
> its solid black, i'd expect the same from the scaled screenshot.
>


It seems that the problem is with FFmpeg 0.8.7(release) scaler - it adds
noise.
Nov 29 2011 GIT (0.8.7.git-b6ffe44) works fine, no detectable noise.
Here are some samples:  http://doom10.org/index.php?topic=2034

Thank you all.