[Cin] mpeg2hd422p.m2ts - groundwork for a high-end preset
Phyllis Smith
phylsmith2017 at gmail.com
Mon Jun 9 03:01:12 CEST 2025
>
> 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:
>
Also tested mpeg2hd422p.m2ts as Terje/Andrew-R worked on and it works
great! Thank you. I have been testing the upcoming ffmpeg version 8.0 and
it works there also as expected. I will check it into GIT next time I boot
the desktop.
On Sun, Jun 8, 2025 at 3:40 PM Terje J. Hanssen via Cin <
cin at lists.cinelerra-gg.org> wrote:
>
>
> Den 08.06.2025 17:49, skrev Andrew Randrianasulu:
>
>
>
> вс, 8 июн. 2025 г., 18:26 Terje J. Hanssen via Cin <
> cin at lists.cinelerra-gg.org>:
>
>>
>>
>> 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 at 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?
>
>
>
>
> --
> Cin mailing list
> Cin at lists.cinelerra-gg.org
> https://lists.cinelerra-gg.org/mailman/listinfo/cin
>
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