go2rtc/pkg/mp4

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