AV1 record

[21pages]

1. Support record AV1
   AV1's codec private data is from the encode side, use four zero instead works.

2. Fix client side record, test 1.2.4 record 1.1.9~1.2.4 ok, older version can't record 1.2.4 with any codec, update if needed.

• The server side does not send SwitchDisplay on every video_service::run, older versions rely on this message to start recording.
• Stop recording when switching the display, because the VideoHandler is created when receiving the frame, later than the switch display command.

1.2.4_to_1.2.4.mp4