[FFmpeg-user] bgra to yuv

[Paul B Mahol]

On 3/25/12, Josh long <funkyirish at gmail.com> wrote:
>>
>>
>> For lossless with that codec use "-global_quality 0".
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>
> Thanks, but it seems that I'm not doing this correctly as there is a lot of
> distortion again.  Could you tell me where I'm going wrong here? I also
> tried it (first) just using -global_quality 0, and it didn't work well so I
> added the -q 0 before it.

Converting from one colorspace to another one may not be lossless.

So if you do not want distortions at all only colorspace conversions which are
actually lossless should be used.

>
> #include<stdio.h>
> #include<stdlib.h>
> #include<string.h>
>
> main(){
>   char out[120];
>   int a;
>   for(a=0;a<25;a++){
>   sprintf(out,"ffmpeg -i 0libschbgra%d.avi -vcodec libschroedinger -q 0
> -global_quality 0 0libsch%d.avi\n",a,a);
>   system(out);
>   sprintf(out,"ffmpeg -i 0libsch%d.avi -vcodec rawvideo -pix_fmt bgra -q 0
> 0libschbgra%d.avi\n",a,a+1);
>   system(out);
>   }
> }
>
> thanks again,
>
> Joshua
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> ffmpeg-user at ffmpeg.org
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>