[FFmpeg-user] Correct conversion of yuvj420p?

[Paul B Mahol]

On Tue, Sep 08, 2020 at 04:12:30PM +0200, Peter B. wrote:
> Dear Paul,
> 
> On 07.09.20 23:57, Paul B Mahol wrote:
> > On Mon, Sep 07, 2020 at 11:20:10PM +0200, Peter B. wrote:
> > > [...]
> > > The source video is: yuvj420p(pc, smpte170m/bt709/bt709)
> > > The output video is: yuv420p(pc, smpte170m/bt709/bt709)
> > > 
> > > What would be the right commandline to losslessly convert this to FFV1?
> > > I've tried, but so far I get differing streamhash MD5s for the video -
> > > regardless if I set the color range :(
> > ffmpeg -i input_video.mov -vf setrange=limited -c:v ffv1 out.mkv
> > 
> > That command will tell ffmpeg that range is not full but limited
> > and will not do lossy conversion with swscale at all.
> 
> That worked! Thank you!
> Streamhash says it's a match :)
> 
> 
> > You will need to signal that encoded video is still full range somehow in container,
> > otherwise you will get correct hash but output display will think
> > its really limited while it is actually still full range.
> 
> Thanks for pointing that out.
> I've done the following:
> 
> $FFMPEG -i $VIDEO_IN -an -c:v ffv1 \
>  -vf setrange=limited \
>  -pix_fmt yuv420p \
>  -color_range jpeg \
>  -colorspace smpte170m \
>  -color_primaries bt709 \
>  -color_trc bt709 \
> out.mkv
> 
> The streamhash matches, and the color interpretation metadata seems to be
> identical to the source:
> 
>   * Source video (h.264):
>     yuvj420p(pc, smpte170m/bt709/bt709)
> 
>   * Target video (ffv1):
>     yuv420p(pc, smpte170m/bt709/bt709)

This is not reporting color range. Better check it matches.

> 
> 
> 
> Thanks again Paul!
> Peter
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