This example capture a raw video stream (optional tape playback) from
the camera sensor over HDMI out and transcode audio to PCM into
ffv1hd422p.mkv for preservation purpose.
-input_format yuyv422 -video_size hd1080 possibly may be commented out,
as the encoder default uses the maximum capability it get from the
capture card ms2130 and driver v4l2
The video part is used from this source
https://avpres.net/FFmpeg/im_FFV1.html
At this high bitrate 320Mbps+ here, a combination with segmented
recording is recommended and neccesary to control the file sizes
(segments) and eventually corrupted parts better.
ffmpeg -hide_banner -f v4l2 -framerate 50 -i /dev/video0 -f alsa -ac 2
-i hw:CARD=UHD,DEV=0 -c:v ffv1 -level 3 -threads 8 -coder 1 -context 1
-g 1 -slices 24 -slicecrc 1 -c:a pcm_s16le -t 10 -f matroska
ffv1hd422p_preserv.mkv
Input #0, video4linux2,v4l2, from '/dev/video0':
Duration: N/A, start: 89.753684, bitrate: 1658880 kb/s
Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1920x1080,
1658880 kb/s, 50 fps, 50 tbr, 1000k tbn
[aist#1:0/pcm_s16le @ 0x560bdabb0480] Guessed Channel Layout: stereo
Input #1, alsa, from 'hw:CARD=UHD,DEV=0':
Duration: N/A, start: 1749208074.680286, bitrate: 1536 kb/s
Stream #1:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo (native) -> ffv1 (native))
Stream #1:0 -> #0:1 (pcm_s16le (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, matroska, to 'ffv1hd422p_preserv.mkv':
Metadata:
encoder : Lavf61.7.100
Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), yuv422p(tv,
progressive), 1920x1080, q=2-31, 200 kb/s, 50 fps, 1k tbn
Metadata:
encoder : Lavc61.19.101 ffv1
Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz,
stereo, s16, 1536 kb/s
Metadata:
encoder : Lavc61.19.101 pcm_s16le
[out#0/matroska @ 0x560bdabb0600] video:388733KiB audio:1875KiB
subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead:
0.014887%
frame= 500 fps= 50 q=-0.0 Lsize= 390666KiB time=00:00:10.00
bitrate=320033.5kbits/s speed=0.999x
--
Cin mailing list
Cin@lists.cinelerra-gg.org
https://lists.cinelerra-gg.org/mailman/listinfo/cin
