[FFmpeg-user] Dithering, debanding while transcoding

[Robert Krüger]

On Mar 29, 2011, at 7:48 PM, Stefano Sabatini wrote:

> On date Tuesday 2011-03-29 13:19:55 +0200, Robert Krüger encoded:
>> 
>> Hi,
>> 
>> I have raw footage (H.264, 8 bit, yuv420) which has very minor
>> compression artifacts in some areas, which I would like to tweak a
>> little (dithering, debanding) while transcoding it to XDCAM 422
>> (MPEG-2). Are there any libavfilters or advanced command line
>> options that might help?
> 
> Did you try gradfun?
> 
> But note that:
> |This  filter is designed for playback only.  Do not use it prior
> |to lossy compression, because  compression  tends  to  lose  the
> |dither and bring back the bands.

No, I haven't tried it but I observed the same behavior with more banding being introduced when I denoised the footage using hq3dn before recompressing. Just out of curiosity, I will try it but then it doesn't really seem like it will help in my case.

Thanks for the hints