Hi guys.
I'm trying to transcode a stream from a smartphone into a file:
-> $ ffprobe rtsp://192.168.1.125:8080/video/h264
...
Duration: N/A, start: -3627.773756, bitrate: N/A
Stream #0:0: Video: h264 (Constrained Baseline),
yuv420p(progressive), 3840x2160, 90k tbr, 90k tbn
-> $ ffmpeg -hwaccel vaapi -hwaccel_device
/dev/dri/renderD128 -hwaccel_output_format vaapi -i
rtsp://192.168.1.125:8080/video/h264 -avoid_negative_ts
make_zero -fflags +genpts -c:v av1_vaapi -b:v 8M av1-h264.mp4 -y
...
encoder : Lavf61.7.100
Stream #0:0: Video: av1 (Main) (av01 / 0x31307661),
vaapi(tv, progressive), 3840x2160, q=2-31, 8000 kb/s, 24.58
fps, 18880 tbn
Metadata:
encoder : Lavc61.19.101 av1_vaapi
frame= 32 fps= 32 q=-0.0 size= 1024KiB time=01:31:29.32
bitrate= 1.5kbits/s dup=0 drop=2 speed=5.49e+03x
frame= 44 fps= 29 q=-0.0 size= 1280KiB time=01:31:29.81
bitrate= 1.9kbits/s dup=0 drop=2 speed=3.66e+03x frame=
58 fps= 29 q=-0.0 size= 1792KiB time=01:31:30.38
bitrate= 2.7kbits/s dup=0 drop=2 speed=2.74e+03x
frame= 82 fps= 27 q=-0.0 size= 2560KiB time=01:31:31.36
bitrate= 3.8kbits/s dup=0 drop=2 speed=1.83e+03x
frame= 94 fps= 27 q=-0.0 size= 3072KiB time=01:31:31.85
bitrate= 4.6kbits/s dup=0 drop=2 speed=1.57e+03x frame=
106 fps= 26 q=-0.0 size= 3584KiB time=01:31:32.33
bitrate= 5.3kbits/s dup=0 drop=2 speed=1.37e+03x frame=
118 fps= 26 q=-0.0 size= 3840KiB time=01:31:32.82
bitrate= 5.7kbits/s dup=0 drop=2 speed=1.22e+03x frame=
1003 fps= 25 q=-0.0 size= 38656KiB time=01:32:08.82
bitrate= 57.3kbits/s dup=0 drop=7 speed= 136x
I'm thinking - being a complete novice - it has something to
do with the original stream (as opposed to VAAPI) for only
'ffplay' does play the output file fine.
Any other player shows time duration for the output - being
under a minute of recording - to be an hour & a half long.
Playback does not work unless I move manually towards the
end, toward that last minute, then it starts to playback.
Any advice much appreciated.
many thanks, L.
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