[Cin] mpeg2hd422p.m2ts - groundwork for a high-end preset
Terje J. Hanssen
terjejhanssen at gmail.com
Mon Jun 9 22:26:11 CEST 2025
On 09.06.2025 16:13, Andrew Randrianasulu wrote:
>
>
> пн, 9 июн. 2025 г., 00:39 Terje J. Hanssen <terjejhanssen at gmail.com>:
>
>
>
> 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?
>
>
> you just add/replace on top of previous preset (do this for both audio
> and video parts of profile) with this
>
> segment mpeg2video
> segment_format=mpegts
> segment_time=00:10 <= your segment time
> reset_timestamps=1
> [..] rest of options
>
> and then save as name.seg
>
> basically replace very first word with "segment"
> add three lines explaining to libavformat what kind of muxer/seg. time
> it must use, save with extension .seg
>
> repeat for audio profile.
Yes, thanks. Segmented recording works.
Attach the completed presets used.
>
> For having "format" gui button working you need patch I send earlier.
I'm not sure I understand what "format" gui button working mean here?
And is it possible to patch the rpm installation without having the
build system, possibly how to do it?
>
>
>
>
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-------------- next part --------------
segment mpeg2video
segment_format=mpegts
segment_time=00:10 <= your segment time
reset_timestamps=1
cin_pix_fmt=yuv422p
b=35M
dc=10
muxrate=38M
minrate=35M
maxrate=35M
bufsize=38M
bf=2
profile=high
refs=1
-------------- next part --------------
segment pcm_bluray
segment_format=mpegts
segment_time=00:10 <= your segment time
reset_timestamps=1
id 0x1100
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