[Libav-user] decoding video frames
alexcohn at netvision.net.il
Thu May 10 16:03:04 CEST 2012
On Thu, May 10, 2012 at 3:43 PM, Bob Self <bobslf at gmail.com> wrote:
> I'm trying to decode video frames. The decoding loop prints this message:
> [mpeg4 @ 00823420] Invalid and inefficient vfw-avi packed B
> frames detected
> After that it prints these lines over and over:
> [mpeg4 @ ...] slice end not reached but screenspace end (5 left
> 78000, score= -2)
> [mpeg4 @ ...] concealing 1350 DC, 1350 AC, 1350 MV errors
> What causes these warning messages? Is this the correct way to decode video?
Such problems could be caused by some strange video steams. Therefore
it's important to decode your file with the latest command-line
ffmpeg. If its output is not as expected, it's also recommended to use
alternative players: either the video may be corrupt, or there may be
a bug in ffmpeg.
But if ffmpeg succeeds, your code must be analyzed for problems.
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