You can delete the originals and intermediate files once you confirm the output.mp4 file is correct.-vf scale=w=640:h=360:force_original_aspect_ratio=decrease -c:a aac -ar 48000 -c:v h264 -profile:v main -crf 20 -sc_threshold 0 -g 48 -keyint_min 48 -hls_time 4 -hls_playlist_type vod -b:v 800k -maxrate 856k -bufsize 1200k -b:a 96k -hls_segment_filename sample/360p_%03d.ts sample/360p.m3u8 \ This is an annoying interim step for long-running footage from a GoPro-and I've noticed other action cams and dash cams seem to do the same thing.Īnd unfortunately, you can't just use concat: to join the files together in a one-liner, you have to build the intermediate files first (thus you need triple the original footage's size on your disk to do this trick). In the end, you should get a losslessly-joined MP4 file with the contents of all the video files from the sequence. This assumes I renamed my files from the GoPro to 1.mp4 and so on, and I'm in the same directory as those files. Note: If you use the 'High Efficiency' (HEVC) encoder for your GoPro videos, change h264_mp4toannexb to hevc_mp4toannexb in the above commands. So I found this answer on StackOverflow, which had exactly the commands I needed: ffmpeg -i 1.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate1.tsįfmpeg -i 2.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate2.tsįfmpeg -i 3.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate3.tsįfmpeg -i 4.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate4.tsįfmpeg -i "concat:intermediate1.ts|intermediate2.ts|intermediate3.ts|intermediate4.ts" -c copy -bsf:a aac_adtstoasc output.mp4 There are various reasons for this, but in the end, I really wanted one long file, so it would be easier to synchronize with footage from another camera and my audio recorder. I recently shot some footage with a GoPro, and realized after the fact the GoPro 'chapters' the footage around 4 GB, so I ended up with a number of 4 GB files, instead of one larger file.
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