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| # losslessly concat mp4 files | |
| ffmpeg -i input1.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate1.ts | |
| ffmpeg -i input2.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate2.ts | |
| ffmpeg -i "concat:intermediate1.ts|intermediate2.ts" -c copy -bsf:a aac_adtstoasc output.mp4 | |
| # encode Xvid | |
| ffmpeg -i input.avi -c:v mpeg4 -vtag xvid -b:v 600k -c:a libmp3lame output.avi | |
| # encode h264 | |
| ffmpeg -i input.avi -c:v libx264 -preset ultrafast -crf 22 -c:a copy output.mp4 |
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