[FFmpeg-user] HD > SD Down-Convert Prores Color

Kevin Wells kevwells at hotmail.co.uk
Sun May 17 08:20:40 CEST 2015

> To: ffmpeg-user at ffmpeg.org
> From: cehoyos at ag.or.at
> Date: Sat, 16 May 2015 21:52:49 +0000
> Subject: Re: [FFmpeg-user] HD> SD Down-Convert Prores Color
> Kevin Wells <kevwells <at> hotmail.co.uk> writes:
>>>>> $ ffmpeg -i HD_BARS.mov -an -vcodec copy out1.mov
>>>>> $ ffmpeg -i HD_BARS.mov -an -vcodec v210 out2.mov
>>>>> $ ffmpeg -i HD_BARS.mov -an -vcodec prores out3.mov
>> I checked on fcp video scopes and also QuickTime player,
>> and they are exactly the same. What's the next step?
> An explanation why I see different results:
> I am testing on a vanilla 10.10.3 system and out1.mov,
> out2.mov and out3.mov all look different than HD_BARS.mov
> when played with QT Player.
> The difference I see is exactly the same as the one you
> showed in this mail:
> http://thread.gmane.org/gmane.comp.video.ffmpeg.user/56851/focus=56941
> Is it possible that the installation of FCP makes a difference?
> Carl Eugen
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> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-user

Hi Carl, I am on 10.10.3, but with FCP installed. I open all 4 movs up in QT player 10 and took a screen grab of all 4 lined up. There is a slight but acceptable difference between out1 and out3 and the original HD, but it's what I would expect on converting between different compressions. Out2 is a bit more different though, this could be because of the 10 bit conversion and uncompressed. Not sure what sort of difference you are seeing. So all in all, I think they all look OK?
Screen grab attached for reference. From top to bottom, Original_HD, out1, out2, out3.

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