GoPro

It’s a pain to get Premiere out just to combine the split-out video files that GoPro creates. Fortunately ffmpeg allows you to concatenate them via the command line. I found this blog post most helpful. Good explanations, concise example. Copies all streams (which includes metadata such as rotation, which is lost unless you do the maps below). TLDR:

ffmpeg -f concat -safe 0 -i merged.txt -c copy -map 0:0 -map 0:1 -map 0:3 -pix_fmt yuvj420p output-76.mp4

Other helpful links:

• https://creatomate.com/blog/how-to-rotate-videos-using-ffmpeg