Got some progress, using the command below bypassed the two errors
('[video4linux2,v4l2 @ 0x2015cd0] Error allocating a packet.' And '/dev/video0:
Cannot allocate memory') also, CPU is around 25% and recording time is much
longer now.
However, I get a new problem and other issues; the major problem is that the
output is "fast forward", I guess due to the:
'[video4linux2,v4l2 @ 0xd4cd70] The driver changed the time per frame from 1/30
to 117/7013'
And there are two repeating alerts that I'm not sure their severities:
'ALSA buffer xrun'
and
'Non-monotonous DTS in output stream 0:1;....'
My latest command is:
ffmpeg -y -hide_banner -thread_queue_size 10000 -f alsa -ac 2 -itsoffset 1.5 -i
hw:1,0 -r 30 -thread_queue_size 10000 -re -f v4l2 -i /dev/video0 -vcodec
h264_omx -acodec ac3 -ab 51k -qmin 16 -qmax 16 -b:v 6M -maxrate:v 100M -bufsize
100M -strict experimental -flags +global_header -f mp4 /usr/ramDisk/h264_omx.mp4
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, alsa, from 'hw:1,0':
Duration: N/A, start: 1589804042.680866, bitrate: 1536 kb/s
Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
[video4linux2,v4l2 @ 0xd4cd70] The driver changed the time per frame from 1/30
to 117/7013
Input #1, video4linux2,v4l2, from '/dev/video0':
Duration: N/A, start: 2077.501466, bitrate: 1988671 kb/s
Stream #1:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1920x1080,
1988671 kb/s, 59.94 fps, 59.94 tbr, 1000k tbn, 1000k tbc
Stream mapping:
Stream #1:0 -> #0:0 (rawvideo (native) -> h264 (h264_omx))
Stream #0:0 -> #0:1 (pcm_s16le (native) -> ac3 (native))
Press [q] to stop, [?] for help
[h264_omx @ 0xd53160] Using OMX.broadcom.video_encode
Output #0, mp4, to '/usr/ramDisk/h264_omx.mp4':
Metadata:
encoder : Lavf58.20.100
Stream #0:0: Video: h264 (h264_omx) (avc1 / 0x31637661),
yuv420p(progressive), 1920x1080, q=16-16, 6000 kb/s, 30 fps, 15360 tbn, 30 tbc
Metadata:
encoder : Lavc58.35.100 h264_omx
Stream #0:1: Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, stereo, fltp, 48 kb/s
Metadata:
encoder : Lavc58.35.100 ac3
[alsa @ 0xd39450] Thread message queue blocking; consider raising the
thread_queue_size option (current value: 10000)
[alsa @ 0xd39450] ALSA buffer xrun. 8960kB time=00:00:31.50
bitrate=2329.5kbits/s speed=0.554x
[alsa @ 0xd39450] ALSA buffer xrun. 9472kB time=00:00:35.06
bitrate=2213.1kbits/s speed=0.552x
[alsa @ 0xd39450] ALSA buffer xrun. 9984kB time=00:00:39.38
bitrate=2076.8kbits/s speed=0.553x
[alsa @ 0xd39450] ALSA buffer xrun.10496kB time=00:00:42.55
bitrate=2020.7kbits/s speed=0.55x
[alsa @ 0xd39450] ALSA buffer xrun.11520kB time=00:00:48.76
bitrate=1935.4kbits/s speed=0.547x
[alsa @ 0xd39450] ALSA buffer xrun.13312kB time=00:00:51.99
bitrate=2097.5kbits/s speed=0.546x
[alsa @ 0xd39450] ALSA buffer xrun.15872kB time=00:00:56.05
bitrate=2319.5kbits/s speed=0.549x
[alsa @ 0xd39450] ALSA buffer xrun.17152kB time=00:00:59.03
bitrate=2380.3kbits/s speed=0.553x
[alsa @ 0xd39450] ALSA buffer xrun.17920kB time=00:01:01.97
bitrate=2368.7kbits/s speed=0.549x
[alsa @ 0xd39450] ALSA buffer xrun.22272kB time=00:01:05.76
bitrate=2774.3kbits/s speed=0.556x
[alsa @ 0xd39450] ALSA buffer xrun.25344kB time=00:01:10.02
bitrate=2965.0kbits/s speed=0.558x
[alsa @ 0xd39450] ALSA buffer xrun.26368kB time=00:01:13.13
bitrate=2953.4kbits/s speed=0.558x
[alsa @ 0xd39450] ALSA buffer xrun.26880kB time=00:01:15.82
bitrate=2904.0kbits/s speed=0.554x
[alsa @ 0xd39450] ALSA buffer xrun.27904kB time=00:01:19.53
bitrate=2874.1kbits/s speed=0.553x
[alsa @ 0xd39450] ALSA buffer xrun.29184kB time=00:01:21.55
bitrate=2931.3kbits/s speed=0.551x
[alsa @ 0xd39450] ALSA buffer xrun.29440kB time=00:01:23.27
bitrate=2896.2kbits/s speed=0.552x
[mp4 @ 0xd51e60] Non-monotonous DTS in output stream 0:1; previous: 4014288,
current: 4014166; changing to 4014289. This may result in incorrect timestamps
in the output file.
[mp4 @ 0xd51e60] Non-monotonous DTS in output stream 0:1; previous: 4014289,
current: 4014138; changing to 4014290. This may result in incorrect timestamps
in the output file.
[mp4 @ 0xd51e60] Non-monotonous DTS in output stream 0:1; previous: 4014290,
current: 4014163; changing to 4014291. This may result in incorrect timestamps
in the output file.
[alsa @ 0xd39450] ALSA buffer xrun.31744kB time=00:01:26.67
bitrate=3000.4kbits/s speed=0.55x
[alsa @ 0xd39450] ALSA buffer xrun.37888kB time=00:01:30.91
bitrate=3413.9kbits/s speed=0.552x
[alsa @ 0xd39450] ALSA buffer xrun.38656kB time=00:01:33.21
bitrate=3397.0kbits/s speed=0.549x
frame= 2840 fps= 16 q=-0.0 Lsize= 39185kB time=00:01:37.30
bitrate=3298.9kbits/s speed=0.564x
video:38681kB audio:452kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.131004%
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