ffmpeg  -nostats  -hide_banner -loglevel info -rtsp_transport tcp -i rtsp://xx -an -vcodec copy -bsf:v hevc_metadata=tick_rate=1 /tmp/out.hevc -y
[hevc @ 0x564864b07680] VPS 0 does not exist
    Last message repeated 1 times
Input #0, rtsp, from 'rtsp://xx':
  Metadata:
    title           : Media Presentation
  Duration: N/A, start: 0.040000, bitrate: N/A
    Stream #0:0: Video: hevc (Main), yuv420p(tv), 1280x720, 2 fps, 1 tbr, 90k tbn, 2 tbc
Output #0, hevc, to '/tmp/out.hevc':
  Metadata:
    title           : Media Presentation
    encoder         : Lavf58.20.100
    Stream #0:0: Video: hevc (Main), yuv420p(tv), 1280x720, q=2-31, 2 fps, 1 tbr, 2 tbn, 2 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
frame=  110 fps=1.2 q=-1.0 Lsize=   10165kB time=00:01:48.50 bitrate= 767.5kbits/s speed=1.15x
video:10165kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%

ffprobe -hide_banner /tmp/out.hevc
Input #0, hevc, from '/tmp/out.hevc':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: hevc (Main), yuv420p(tv), 1280x720, 1 fps, 1 tbr, 1200k tbn, 1 tbc

ffmpeg  -nostats  -hide_banner -loglevel error -i /tmp/out.hevc -an -vcodec copy -bsf:v hevc_metadata=tick_rate=1 /tmp/out.mkv -y

ffprobe -hide_banner /tmp/out.mkv
Input #0, matroska,webm, from '/tmp/out.mkv':
  Metadata:
    ENCODER         : Lavf58.20.100
  Duration: 00:01:50.00, start: 0.000000, bitrate: 757 kb/s
    Stream #0:0: Video: hevc (Main), yuv420p(tv), 1280x720, 1 fps, 1 tbr, 1k tbn, 1 tbc (default)
    Metadata:
      DURATION        : 00:01:50.000000000

ffmpeg  -nostats  -hide_banner -loglevel info -rtsp_transport tcp -i rtsp://xx -an -vcodec copy -bsf:v hevc_metadata=tick_rate=1 -f matroska /tmp/out.mkv -y
[hevc @ 0x55fda6886840] VPS 0 does not exist
    Last message repeated 1 times
Input #0, rtsp, from 'rtsp://xx':
  Metadata:
    title           : Media Presentation
  Duration: N/A, start: 0.040000, bitrate: N/A
    Stream #0:0: Video: hevc (Main), yuv420p(tv), 1280x720, 2 fps, 1 tbr, 90k tbn, 2 tbc
Output #0, matroska, to '/tmp/out.mkv':
  Metadata:
    title           : Media Presentation
    encoder         : Lavf58.20.100
    Stream #0:0: Video: hevc (Main), yuv420p(tv), 1280x720, q=2-31, 2 fps, 1 tbr, 1k tbn, 90k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[matroska @ 0x55fda6888900] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
frame=   51 fps=1.3 q=-1.0 Lsize=    4637kB time=00:00:49.00 bitrate= 775.2kbits/s speed=1.28x
video:4636kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.034634%

ffprobe -hide_banner /tmp/out.mkv
[AVBSFContext @ 0x55b897eb1980] No start code is found.
/tmp/out.mkv: Invalid data found when processing input