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The fourth stream apparently is a CEA-608 subtitle stream, which during the days of analog television signal transmission was caption data embedded within the video data. Apparently FFmpeg can extract it but can't mux it to a new container. As for stripping only the audio, MP4Box may be of help.


Technically, you could map a network drive from whatever server you're talking about to your local machine, and then use something like a blackmagic h264 prorecorder to live encode a file to that folder. It'll be a completed mp4 when you press stop, and ready to view instantly. But that's the easy part... What will your website look like? How will it ...


The Apple video uses a profile with fewer reference frames and also carries a streaming hint track. The following ffmpeg command template should create a quick seeking MP4 file: ffmpeg -i input -c:v libx264 -profile:v baseline -x264opts keyint=3:min-keyint=2 -{other video encoding parameters} -{audio encoding parameters} -movflags +faststart+rtphint ...


Judge based on the quality rather than the bitrate value. Use CRF mode encoding and if the quality isn't what you can accept, decrease the CRF value. ffmpeg -i "%%a" -s 3840x2610 -c:v libx264 -crf 18 -acodec copy D:\%%~na.mp4

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