[FFmpeg-user] ProRes -> MPEG2 bug: color shifting?

[Andreas Gumm]

Just to correct some things,
Edius is right in ProRes interpretation if the source footage is correctly
encoded in YUV2 at correct levels. Edius does wrong interpretation only
when ProRes is encoded at full range in YUV2 color space.

Quicktime colorshift can be seen in QT Player Window.
NLE vendors are using QT API and there is no color shift if they are using
the API parameters properly.

Andreas
Am 15.08.2015 17:48 schrieb "linxs" <linxsy at gmail.com>:

> Thank you for you repy!
> "There is a horrible bug in Quicktime that causes gamma shifts"
> --> Can you tell more detail? Thanks!
>
>
> 2015-08-13 19:17 GMT+08:00 Bouke (VideoToolShed) <bouke at videotoolshed.com
> >:
>
> > ---- Original Message ----- From: "linxs" <linxsy at gmail.com>
> > To: "FFmpeg user questions" <ffmpeg-user at ffmpeg.org>
> > Sent: Thursday, August 13, 2015 7:21 AM
> > Subject: [FFmpeg-user] ProRes -> MPEG2 bug: color shifting?
> >
> >
> > Hi,
> >>
> >> I need helps for color shifting. Is it bug? or I am wrong with the
> usage?
> >>
> >> I get a .mov file and its video format is "ProRes 422, 24 fps,
> 1920x1080,
> >> BT.709".
> >> I put the MOV file in this mail as attachment "proress_hq.mov", and only
> >> one frame in this MOV.
> >>
> >> Using ffmpeg to convert it to MPEG-2:
> >> ffmpeg -i proress_hq.mov -c:v mpeg2video -b:v 30M -pix_fmt yuv420p
> my.m2v
> >>
> >> I compared them by previewing "proress_hq.mov" and "my.m2v" in Edius
> and I
> >> found there is a little color difference:
> >> "proress_hq.mov" seems to be a small little brighter than "my.m2v" and
> the
> >> color in "my.m2v" seems to be a little more saturate.
> >>
> >
> > AFAIK, Edius uses Quicktime to decode.
> > There is a horrible bug in Quicktime that causes gamma shifts.
> > What you could try is to convert both your outputs to testfiles, both
> > using the same codec/format.
> > Then compare those two. If they are alike, it's Edius that messes up
> > things.
> >
> > hth,
> > Bouke
> >
> > How can i convert this mov to mpeg2 without color shifting?
> >>
> >
> >
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