[FFmpeg-devel] 10-bit DNxHD support

Baptiste Coudurier baptiste.coudurier
Thu Mar 10 22:08:21 CET 2011


On 03/10/2011 07:07 AM, Joseph Artsimovich wrote:
>>> I am not sure if it's OK or not, but I did notice ffmpeg doesn't
>>> produce pixel-to-pixel identical results compared to Avid's decoder.
>>> The difference can most easily be noticed on smooth gradients.
>> Do you have screenshots ? "smooth gradients" is overly subjective.
>> If you have the vc-3 reference test suite, you can check against these.
> I don't have the reference test suite, so I created a test case:
> http://depositfiles.com/files/zfv1n29rx
> Unfortunately I don't know how to exract and save YUV data using the Windows QuickTime API, so I did the following:
> 1. Generated a DNxHD clip (progressive) using QuickTime Pro.
> 2. Converted it to Animation (qtrle) using QuickTime Pro and using our in-house application that uses libavcodec and libswscale.  I couldn't use pure ffmpeg because I would get colorshift due to problems I mentioned before.
> If you open both animation files and flip between them, you'll notice some minor difference, for example near the top-right corner.

Unfortunately qtrle is rgb so it cannot be used as a comparison.

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