Hi Mike, On Mon, Nov 23, 2015 at 22:56:08 -0600, Mike Grommet wrote:
> During the playback of the combined file, The right side video appears > to zoom in to the top left of itself two times. The originals appear > fine when played individually. Interesting that the latter should happen. I would (personally, not suggesting to) inspect each frame of both files with ffprobe. > I assume it has something to do with these messages from the ffmpeg > run: > Input stream #0:0 frame changed from size:640x480 fmt:yuv420p to size:480x360 > fmt:yuv420p > Input stream #0:0 frame changed from size:480x360 fmt:yuv420p to size:320x240 > fmt:yuv420p That seems likely. :) > I also attempted a different way to merge the files (See Alternative > Command), and it has the same issue. Firstly, you may want to use the vstack filter for this very purpose, it saves you a lot of filter syntax: https://ffmpeg.org/ffmpeg-filters.html#vstack Of course, as it notes, "[all] streams must be of same pixel format and of same width." That said, and considering the weird size jumps in the input: Have you considered just inserting a scale filter to force the original size? Something like $ ./ffmpeg -i a.webm -i b.webm -filter_complex "[0:v]scale=640:480[left]; [1:v]scale=640:480[right]; [left][right]vstack[out] -map [out] -map 0:a -map 1:a c.webm > Additional note: As an experiment, If I first convert the original > .webm files to .mp4, combine these files together with a .webm final > target, I don't experience this problem. This might be an option, but > it seems to be an awfully hacky solution. Even more interesting. Are you re-encoding or just remuxing ("-c copy")? Cheers, Moritz _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
