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Assuming your editor can rotate videos, use ffmpeg -i "recording6.mp4" -vf "transpose=1" -vcodec dnxhd -r 60 -b:v 36M "recording6.mov" This will rotate the video, so the 1080x1920 video becomes 1920x1080.


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H.264 (and the soon-to-be popularized H.265) is highly compressed which means your computer needs to work harder to work with it. ProRes, even though the files are larger, will allow for a smoother editing experience.


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Do you have a m3u8 file? If so, I assume you can just do ffmpeg -i indexfile.m3u8 -acodec copy -vcodec copy output.ts You could also convert it directly into the mp4 container: ffmpeg -i indexfile.m3u8 -acodec copy -vcodec copy output.mp4


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I could imagine that they also use hardware supported transcoding. A company like Google certainly has the resources to make custom FPGA transcoders and then transcoding speed gets blazing.



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