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

linxs linxsy at gmail.com
Sat Aug 15 17:46:40 CEST 2015

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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