My purpose in putting iPhone videos into ffmpegx is to reduce their file size, so I can upload them to Facebook
The problem I'm having though is that "portrait" videos I shot with my iPhone are being flipped onto their side in ffmpegx and coming out as landscape, meaning that everything in the video is now sideways. Is there any way to prevent this from happening? I'm using ffmpegx 0.0.9x r2, don't think I can upgrade as I don't have Lion but Snow Leopard.
Any idea why this is happening?
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You could try encoding with ffmpegX to e.g. "h264 x264" and setting "Decode with Quicktime" in the Options tab. I think this would make the encoder interpret the rotation flag to its intended orientation. Untested, as I do not have such files.