I'm already working on project with 3d video and I have a problem, I got left and right channel of video and I need to merge them into side by side. I already read some blogs about this problem and I got this code:
ffmpeg -i avatar35l.avi -vf "movie=avatar35r.avi [in1]; [in]pad=1920*2:1080[in0]; [in0][in1] overlay=1920:0 [out]" avatar35sbs.avi
It works, but there is significant quality loss and I need the quality of the output video to be the same as the input video: 30fps, 1080p, same length. I'm new to ffmpeg and i need a concrete example of that.
Can anybody help me?
You'll have to use a truly lossless format if you require "a quality of output video same as input video". Example for ffv1 using the hstack filter instead of movie+pad+overlay:
ffmpeg -i left.avi -i right.avi -filter_complex hstack -c:v ffv1 output.avi
FFmpeg supports several additional lossless compressed formats such as:
-c:v libx264 -crf 0-c:v huffyuv-c:v ffvhuff-c:v utvideoSince it is lossless the output file will be huge, and your player or device will probably not like it.
Of course what you may actually want is "lossy, yet 'visually lossless', but not a gigantic, huge file like true lossless provides". In that case use:
ffmpeg -i left.avi -i right.avi -filter_complex "hstack,format=yuv420p" -c:v libx264 -crf 18 output.mp4
You didn't mention audio. If you want to merge the audio from each input as well use the amerge filter:
ffmpeg -i left.avi -i right.avi -filter_complex "[0:v][1:v]hstack,format=yuv420p[v];[0:a][1:a]amerge[a]" -map "[v]" -map "[a]" -c:v libx264 -crf 18 -ac 2 output.mp4