On Tue, Jul 23, 2013 at 12:52 PM, Jason Cipriani <[email protected]>wrote:
> Hello, > > I'm learning how to use libav. I'm following the tutorial at > http://dranger.com/ffmpeg/tutorial01.html and have been able to read > files, decode them, and save each frame to an image just fine. However, > certain input files lead to the frames being decoded upside down (the input > files play correctly in, say, mplayer). > > I have one input file that uses a rawvideo codec. This is decoded upside > down. I have another input file that uses h264, this is decoded in the > correct orientation. > > My question is, is there a flag in some *Context somewhere that indicates > that the video frames are bottom-up, so that I can flip vertically if > necessary when processing the frames after decoding? > > Also, then, it's easy enough for me to process an image upside down if > necessary, but can sws_scale (or something similar) flip an image > vertically so I can do the flip and RGB conversion all in one step? > > Thanks! > Jason > Sorry to be a bother, but does anybody have any insight into this? Thanks! Jason
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