[FFmpeg-devel] DVCPRO HD: request for review

Thomas Parmegiani thomasp
Fri Aug 22 17:15:16 CEST 2008

Hi all,

I tested the patch and it seems to have some errors with 720p files :

According to smpte370 specifications about frame structure :

<<In the 1080-line system, video data, audio data, and subcode data in 
one video frame shall be processed in
each frame. In the 720-line system, these data in two video frames shall 
be processed within one frame
duration of the 1080-line system. >>

So a 720p "frame" consists of two successive 960x720 "fields" (where 
each "fields" is at the full 960x720 resolution).

The given code by Dan Maas seems to only read the first 960x720 picture. 
the second one is dropped. So if you try to transcode a such file you 
will have half of the total number of frame missing.

The old code provided by Roman V.Shaposhnik outputs 960x1440 frame which 
contains both "fields".

Can anyone confirm ?

Thanks in advance.

Best Regards,


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