# README
Fragmented MP4
ffmpeg -i "rtsp://..." -movflags +frag_keyframe+separate_moof+default_base_moof+empty_moov -frag_duration 1 -c copy -t 5 sample.mp4
- movflags frag_keyframe Start a new fragment at each video keyframe.
- frag_duration duration Create fragments that are duration microseconds long.
- movflags separate_moof Write a separate moof (movie fragment) atom for each track.
- movflags default_base_moof Similarly to the omit_tfhd_offset, this flag avoids writing the absolute base_data_offset field in tfhd atoms, but does so by using the new default-base-is-moof flag instead.
https://ffmpeg.org/ffmpeg-formats.html#Options-13
HEVC
Browser | avc1 | hvc1 | hev1 |
---|---|---|---|
Mac Chrome | + | - | + |
Mac Safari | + | + | - |
iOS 15? | + | + | - |
Mac Firefox | + | - | - |
iOS 12 | + | - | - |
Android 13 | + | - | - |
Useful links
- https://stackoverflow.com/questions/63468587/what-hevc-codec-tag-to-use-with-fmp4-hvc1-or-hev1
- https://stackoverflow.com/questions/32152090/encode-h265-to-hvc1-codec
- https://jellyfin.org/docs/general/clients/codec-support.html
- https://github.com/StaZhu/enable-chromium-hevc-hardware-decoding
- https://developer.mozilla.org/ru/docs/Web/Media/Formats/codecs_parameter
- https://gstreamer-devel.narkive.com/rhkUolp2/rtp-dts-pts-result-in-varying-mp4-frame-durations
# Functions
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ParseQuery - like usual parse, but with mp4 param handler.
PatchVideoRotate - update video track transformation matrix.
PatchVideoScale - update "Pixel Aspect Ratio" atom.