[FFmpeg-user] 422 to 444 Upsampling Testbed

[Paul B Mahol]

On 4/28/13, Vincent Olivier <vincent at up4.com> wrote:
>
> On 2013-04-28, at 4:48 PM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:
>
>> Vincent Olivier <vincent <at> up4.com> writes:
>>
>>> - the composite YUV image (in RGB)
>>
>> This sounds like a contradiction.
>
>
>
> It only "sounds" so because I (reasonably) assumed that you would have known
> I meant the reference PNG RGB converted from the 422 source (what one would
> get with a "default" 422 to RGB PNG conversion command).
>
>
>>> - 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'
>>
>> Please always provide your failing command line
>> together with complete, uncut console output.
>
>
> pc1:~ vincent$ ffmpeg -i
> /Volumes/BACKUPT110/CONTENT/20130316191556/XDROOT/Clip/Clip0042.MXF
> -filter_complex
> "split=4[a][b][c][d];[a]pad=iw*4:ih[w];[b]lutyuv=u=128:v=128[x];[c]lutyuv=y=0:v=128[y];[d]lutyuv=y=0:u=128[z];[w][x]overlay=w:0[wx];[wx][y]overlay=w*2:0[wxy];[wxy][z]overlay=w*3:0"
> -vframes 1 yuv.png y.png u.png v.png

Splitting yuv into planes of gray is supported for rawvideo codec only.
Filter could be added that export single or all planes into gray image(s).