Den 08.06.2025 17:49, skrev Andrew Randrianasulu:
вс, 8 июн. 2025 г., 18:26 Terje J. Hanssen via Cin <[email protected]>:
Den 06.06.2025 14:17, skrev Terje J. Hanssen:
While the newer h.264 and hevc are known for best compression, mpeg2 may have better quality at video bitrate > 30Mbps
This example capture a raw video stream (optional tape playback) from the camera sensor over HDMI out and transcode audio to PCM into a high-end mpeg2hd422p.m2ts -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
mpeg2video is difficult to get quit perfect with ffmpeg; muxing overhead: 6.206455% is the minimum I have achieved as in this case.
At this high bitrate, 39Mbps here, a combination with segmented recording is suggested and preferred 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 mpeg2video -refs 1 -bf 2 -b:v 35M -maxrate 35M -minrate 35M -bufsize 38M -muxrate 38M -dc 10 -c:a pcm_bluray -mpegts_m2ts_mode 1 -t 30 -f mpegts mpeg2hd422p_35M.m2ts
Input #0, video4linux2,v4l2, from '/dev/video0': Duration: N/A, start: 79.422429, 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 @ 0x55e2664e95c0] Guessed Channel Layout: stereo Input #1, alsa, from 'hw:CARD=UHD,DEV=0': Duration: N/A, start: 1749208971.359170, 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) -> mpeg2video (native)) Stream #1:0 -> #0:1 (pcm_s16le (native) -> pcm_bluray (native)) Press [q] to stop, [?] for help [mpeg2video @ 0x55e2664d0500] Warning vbv_delay will be set to 0xFFFF (=VBR) as the specified vbv buffer is too large for the given bitrate!
Output #0, mpegts, to 'mpeg2hd422p_35M.m2ts': Metadata: encoder : Lavf61.7.100 Stream #0:0: Video: mpeg2video (4:2:2), yuv422p(tv, progressive), 1920x1080, q=2-31, 35000 kb/s, 50 fps, 90k tbn Metadata: encoder : Lavc61.19.101 mpeg2video Side data: cpb: bitrate max/min/avg: 35000000/35000000/35000000 buffer size: 38000000 vbv_delay: N/A Stream #0:1: Audio: pcm_bluray, 48000 Hz, stereo, s16, 128 kb/s Metadata: encoder : Lavc61.19.101 pcm_bluray [out#0/mpegts @ 0x55e2664e9740] video:128445KiB audio:5648KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 6.206455%
frame= 1500 fps= 50 q=3.5 Lsize= 142416KiB time=00:00:29.98 bitrate=38915.0kbits/s speed=0.998x
I have been able to tune the ffmpeg specifications further:
* '-profile:v 422p -level:v high' (for mpeg-2 profile 422P@HL) * '--ch_layout stereo' (as a replacement for '-ac 2' that caused 'Guessed Channel Layout: stereo')
And also verified the camera HDMI out 'raw video' and 'raw audio' (pcm) using just the ffmpeg input parts:
ffmpeg -hide_banner -f v4l2 -framerate 50 -i /dev/video0 -f alsa -ch_layout stereo -i hw:CARD=UHD,DEV=0
Input #0, video4linux2,v4l2, from '/dev/video0': Duration: N/A, start: 191.096360, bitrate: 1658880 kb/s Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1920x1080, 1658880 kb/s, 50 fps, 50 tbr, 1000k tbn Input #1, alsa, from 'hw:CARD=UHD,DEV=0': Duration: N/A, start: 1749375770.007003, bitrate: 1536 kb/s Stream #1:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Attached here is a full ffmpeg debug log file for verification (command below)
* mpeg2hd422p_35M.log.gz
ffmpeg -loglevel debug -f v4l2 -framerate 50 -i /dev/video0 -f alsa -ch_layout stereo -i hw:CARD=UHD,DEV=0 -c:v mpeg2video -profile:v 422p -level:v high -refs 1 -bf 2 -b:v 35M -maxrate 35M -minrate 35M -bufsize 38M -muxrate 38M -dc 10 -c:a pcm_bluray -mpegts_m2ts_mode 1 -t 30 -f mpegts mpeg2hd422p_35M.m2ts > mpeg2hd422p_35M.log 2>&1
-----------
Among CinGG's existing m2ts presets
cd /Leap_root/usr/share/cin/ffmpeg/video
ls -1 *m2ts
* avc422.m2ts * bluray_bff.m2ts * bluray_dv_ntsc.m2ts * bluray_dv_pal.m2ts * bluray_fakeinterlace.m2ts * bluray_lo.m2ts * bluray.m2ts * bluray_tff.m2ts * hevc422p10.m2ts * hevc422p8.m2ts * lossless.m2ts * visually_lossless.m2ts
grep mpeg2video *m2ts
* That is none so far for mpeg2video HD and 422p
If this preset can be specified and supplemented (?) for use with pcm_bluray and segmented recording, I can test it next ;)
I think you can copy existing mpeg2 m2ts preset with different, desired name (in same folder where other presets reside)
and just add you parameters there?
or try to put text below in new profile ....
mpegts mpeg2video cin_pix_fmt=yuv422p b=35M dc=10 muxrate=38M minrate=35M maxrate=35M bufsize=38M bf=2 profile=high refs=1
Yeah, thank you. Attach the new preset as suggested: cat mpeg2hd422p.m2ts mpegts mpeg2video cin_pix_fmt=yuv422p b=35M dc=10 muxrate=38M minrate=35M maxrate=35M bufsize=38M bf=2 profile=high refs=1 Recorded a test clip mpeg2hd422p.m2ts Start/Stop as below, using the new video preset mpeg2hd422p.m2ts and existing audio preset bluray_lpcm.m2ts, and yes, they seemingly work ok: cin Cinelerra Infinity - built: May 18 2025 05:16:5 ........... Shift-P preferences as previously r(ecord) DeviceV4L2Base::v4l2_open pixels="YUYV"; res="1920x1080 1600x1200 1360x768 1280x1024 1280x960 1280x720 1024x768 800x600 720x576 720x480 640x480" v4l2 s_fmt 1920x1080 YUYV DeviceV4L2Base::v4l2_open VIDIOC_S_STD: Inappropriate ioctl for device audio0 pad 16 0 (16) ---------- ffprobe -hide_banner mpeg2hd422p.m2ts Input #0, mpegts, from 'mpeg2hd422p.m2ts': Duration: 00:01:14.84, start: 0.020000, bitrate: 39006 kb/s Program 1 Stream #0:0[0x1011]: Video: mpeg2video (High) ([2][0][0][0] / 0x0002), yuv422p(tv, bt709/unknown/unknown, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 50 fps, 50 tbr, 90k tbn Side data: cpb: bitrate max/min/avg: 35000000/0/0 buffer size: 38010880 vbv_delay: N/A Stream #0:1[0x1100](eng): Audio: pcm_bluray ([128][0][0][0] / 0x0080), 48000 Hz, stereo, s32 (24 bit), 2304 kb/s Playback ok with vlc and ffplay ---------- The next question; Is segmented recording ready to use here, possibly how?