lou (12022-03-20): > and then resized with same ffmpeg command to reduce file size The advice to use the concat demuxer were sound if it was not for this tidbit of information. Since you are transcoding the files, you should be concatenating before transcoding, as anything else is way less robust. For that, use the concat filter, not the concat protocol: ffmpeg \ -i file1 \ -i file2 \ -lavfi '[0:v][0:a][1:v][1:a]concat=v=1:a=1:n=2' \ <encoding options> Regards, -- Nicolas George
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