[FFmpeg-user] 422 to 444 Upsampling Testbed

Vincent Olivier vincent at up4.com
Sun Apr 28 22:39:44 CEST 2013

Hi Guys,

I'm using the latest from Github.

I'm looking for a way to study of the rescaling/resampling algorithms of FFMPEG and for this I would like to be able to output for a frame from a 422 video to separate PNG files:

- the composite YUV image (in RGB)
- the Y luma (grayscale)
- the U chroma (grayscale)
- the V chroma (grayscale)

I found the "Fancy Filtering Examples" in the wiki and I tried to adapt the example to my needs but: 

1) couldn't get the separate files: "Could not get frame filename number 2 from pattern 'y.png' (either set updatefirst or use a pattern like %03d within the filename pattern)"

2) couldn't get the chroma channels (U&V) as grayscale images

Can anyone help?



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