[Libav-user] Messages from avcodec_decode_video2 and sws_scale

Jeremy Graham jgraham at cs.unc.edu
Fri Jun 29 23:41:18 CEST 2012

Hello, everyone.  I am sure that I am asking very basic questions that 
you all have hashed over time and time again.  However, try as I might, 
I can't seem to find a source of info out there which clearly and 
specifically answers my questions.  Perhaps someone out out there can 
help me to understand the following.

What do general messages about concealing errors from 
avcodec_decode_video2 calls mean?  Should I be concerned about them?  In 
my program, the function returns values that are greater than 0 yet it 
also prints out this message every time: [h264 @ 0xb0b00480] concealing 
920 DC, 920 AC, 920 MV errors.

What does it mean when sws_scale outputs an error message like: 
[swscaler @ 0xb0b505a0] bad dst image pointers?  Is there something very 
particular about the way that it expects to receive the parameter for 
the destination?

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