On Fri, Jul 26, 2013 at 2:40 PM, Alex Cohn <[email protected]>wrote:
> On Jul 23, 2013 7:52 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 > > Yes, you can perform flip and color conversion in one step with sws_scale. > You can find the answer in this thread: > http://ffmpeg-users.933282.n4.nabble.com/Flip-in-sws-scale-td939665.html > > BR, > Alex > > Thanks! That answers my sws_scale question. My remaining problem is: How can I tell if the video needs to be flipped vertically or not? Is there a flag in one of the context structures somewhere? I have some input files that end up vertically flipped, and some that do not, but I'm sure the information exists somewhere because when I play those files in media players, the players are able to play them all in the correct orientation. Thanks again for your time, Jason
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