mux: mp4: add fragmented mp4 muxer
mp4stream tries to build stream with 1.5sec runs. mp4frag aims files by creating a compatible index. Might need for transcode tests (fragments are 1.5 sec only). --sout-x264-keyint=30 --sout-avcodec-strict=-2 Streaming done using http, with fragment start used as iframes.
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