On Tue, 25 Jan 2022 15:30:06 +0500, Nikita Zlobin <nick877...@gmail.com> wrote:
>So, there's another way - explicitly convert all to same format, >unifying everything (with filters format, scale, setsar) for video. >As it starts working - see, what could be omited from these extra >options. So I found a thread on StackOverflow: https://stackoverflow.com/questions/7333232/how-to-concatenate-two-mp4-files-using-ffmpeg And as the accepted reply is this where your suggestion is apparently used: [quote] I ended up using mpg as the intermediate format and it worked (NOTE this is a dangerous example, -qscale 0 will re-encode the video...) ffmpeg -i 1.mp4 -qscale 0 1.mpg ffmpeg -i 2.mp4 -qscale 0 2.mpg cat 1.mpg 2.mpg | ffmpeg -f mpeg -i - -qscale 0 -vcodec mpeg4 output.mp4 [/quote] So I used this: ffmpeg -hide_banner -i input1.mp4 -qscale 0 1.mpg ffmpeg -hide_banner -i input2.mp4 -qscale 0 2.mpg cat 1.mpg 2.mpg | ffmpeg -f mpeg -i - -qscale 0 -vcodec mpeg4 output.mp4 The resulting video plays well and at the cut position between them it keeps audio sync. So far so good, now the remaining problem I have is that the file size is blown up considerably.. input1.mp4 = 98,302,009 bytes input2.mp4 = 53,629,084 bytes 1.mpg is = 930,535,424 bytes 2.mpg is = 385,169,408 bytes output.mp4 = 1,095,027,291 bytes Is there a way to reduce the size of the final mp4 too? -- Bo Berglund Developer in Sweden _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
