[Libav-user] invalid AVPacket size in av_read_frame usage.

[Carl Eugen Hoyos]

daggs <daggs at ...> writes:

> > > I'm writing a program that needs to sample the 
> > > screen in bgra format. the problem is what I try 
> > > to read an av frame, I get this error:
> > > [rawvideo  <at>  0x1403aa0] Invalid buffer size, 
> > > packet size 1228800 < expected frame_size 8294400
> > 
> > Where does the packet come from that you pass to 
> > the video decode function?

?

> > What is the resolution of the video that you 
> > want to decode?
> 
> that is a raw packet of a 1920x1080 screen.

1920 x 1080 x 4 = 8,294,400 so the error seems correct 
to me.

[...]

> which encodes it to the required format (libx264rbg).
> 
> if I'm not mistaken, scaling the frame to yuv420p 
> will drop the quality of the frame which I don't 
> want to have.

That doesn't explain why you need the rawvideo decoder.
Or are you using libavformat to capture the screen?
(You didn't say so.)

Carl Eugen