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<div class="moz-cite-prefix">Den 05.05.2025 16:05, skrev Andrew
Randrianasulu:<br>
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<div dir="ltr" class="gmail_attr">пн, 5 мая 2025 г., 17:00
Andrew Randrianasulu <<a
href="mailto:randrianasulu@gmail.com"
moz-do-not-send="true" class="moz-txt-link-freetext">randrianasulu@gmail.com</a>>:<br>
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<div dir="ltr" class="gmail_attr">пн, 5 мая 2025 г.,
16:26 Terje J. Hanssen via Cin <<a
href="mailto:cin@lists.cinelerra-gg.org"
target="_blank" rel="noreferrer"
moz-do-not-send="true"
class="moz-txt-link-freetext">cin@lists.cinelerra-gg.org</a>>:<br>
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<div> I consider to make a second preservation
backup for archiving my Analog S-video and HDV
footages on tapes to lossless compressed
FFV1.MKV files stored on large USB3 expansion
disks. Also ffv1 HW (vulkan) decoding (next and
encoding (later?) are of interest in this
context.<br>
<br>
Related previous threads<br>
<a
href="https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg05547.html"
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<a
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rel="noreferrer noreferrer" target="_blank"
moz-do-not-send="true"
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<a
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<br>
I adapt simply the last ffmpeg mpeg-2 code line
to a first ffv1, version 3 test, 10 sec file<br>
<br>
ffmpeg -hide_banner -f v4l2 -input_format
yuyv422 -video_size 720x576 -framerate 50 -i
/dev/video0 -f alsa -ac 2 -i hw:CARD=UHD,DEV=0
-c:v ffv1 -level 3 -c:a pcm_s16le -t 10
720x576_50fps+alsa_ms2130_ffv1-3+pcm.mkv<br>
<blockquote>Input #0, video4linux2,v4l2, from
'/dev/video0':<br>
Duration: N/A, start: 351.803278, bitrate:
331776 kb/s<br>
Stream #0:0: Video: rawvideo (YUY2 /
0x32595559), yuyv422, 720x576, 331776 kb/s, 50
fps, 50 tbr, 1000k tbn<br>
[aist#1:0/pcm_s16le @ 0x555a99736cc0] Guessed
Channel Layout: stereo<br>
Input #1, alsa, from 'hw:CARD=UHD,DEV=0':<br>
Duration: N/A, start: 1746445045.742179,
bitrate: 1536 kb/s<br>
Stream #1:0: Audio: pcm_s16le, 48000 Hz,
stereo, s16, 1536 kb/s<br>
Stream mapping:<br>
Stream #0:0 -> #0:0 (rawvideo (native)
-> ffv1 (native))<br>
Stream #1:0 -> #0:1 (pcm_s16le (native)
-> pcm_s16le (native))<br>
Press [q] to stop, [?] for help<br>
Output #0, matroska, to
'720x576_50fps+alsa_ms2130_ffv1-3+pcm.mkv':<br>
Metadata:<br>
encoder : Lavf61.7.100<br>
Stream #0:0: Video: ffv1 (FFV1 /
0x31564646), yuv422p(tv, progressive),
720x576, q=2-31, 200 kb/s, 50 fps, 1k tbn<br>
Metadata:<br>
encoder : Lavc61.19.101 ffv1<br>
Stream #0:1: Audio: pcm_s16le ([1][0][0][0]
/ 0x0001), 48000 Hz, stereo, s16, 1536 kb/s<br>
Metadata:<br>
encoder : Lavc61.19.101
pcm_s16le<br>
[out#0/matroska @ 0x555a99736f40]
video:57467KiB audio:1875KiB subtitle:0KiB
other streams:0KiB global headers:0KiB muxing
overhead: 0.069226%<br>
frame= 500 fps= 50 q=-0.0 Lsize= 59383KiB
time=00:00:10.00 bitrate=48646.9kbits/s
speed=0.998x <br>
</blockquote>
<br>
----------<br>
<br>
du -sh *<br>
58M 720x576_50fps+alsa_ms2130_ffv1-3+pcm.mkv<br>
<br>
----------<br>
<br>
ffprobe -hide_banner
720x576_50fps+alsa_ms2130_ffv1-3+pcm.mkv<br>
<blockquote>Input #0, matroska,webm, from
'720x576_50fps+alsa_ms2130_ffv1-3+pcm.mkv':<br>
Metadata:<br>
ENCODER : Lavf61.7.100<br>
Duration: 00:00:10.00, start: 0.000000,
bitrate: 48646 kb/s<br>
Stream #0:0: Video: ffv1 (FFV1 /
0x31564646), yuv422p(tv, progressive),
720x576, 50 fps, 50 tbr, 1k tbn<br>
Metadata:<br>
ENCODER : Lavc61.19.101 ffv1<br>
DURATION : 00:00:10.000000000<br>
Stream #0:1: Audio: pcm_s16le, 48000 Hz, 2
channels, s16, 1536 kb/s<br>
Metadata:<br>
ENCODER : Lavc61.19.101
pcm_s16le<br>
DURATION : 00:00:10.000000000<br>
</blockquote>
<br>
------------ <br>
<br>
mediainfo
720x576_50fps+alsa_ms2130_ffv1-3+pcm.mkv<br>
<blockquote>General<br>
Unique ID :
158479793538002634101121179263279280827
(0x773A19163BEA6038DF448CE1529BB2BB)<br>
Complete name :
720x576_50fps+alsa_ms2130_ffv1-3+pcm.mkv<br>
Format :
Matroska<br>
Format version :
Version 4<br>
File size :
58.0 MiB<br>
Duration : 10
s 0 ms<br>
Overall bit rate mode :
Variable<br>
Overall bit rate :
48.6 Mb/s<br>
Frame rate :
50.000 FPS<br>
Writing application :
Lavf61.7.100<br>
Writing library :
Lavf61.7.100<br>
ErrorDetectionType : Per
level 1<br>
<br>
Video<br>
ID : 1<br>
Format :
FFV1<br>
Format version :
Version 3.4<br>
Format settings, Slice count : 4
slices per frame<br>
Codec ID :
V_MS/VFW/FOURCC / FFV1<br>
Duration : 10
s 0 ms<br>
Bit rate mode :
Variable<br>
Bit rate :
46.1 Mb/s<br>
Width : 720
pixels<br>
Height : 576
pixels<br>
Display aspect ratio : 5:4<br>
Frame rate mode :
Constant<br>
Frame rate :
50.000 FPS<br>
Color space : YUV<br>
Chroma subsampling :
4:2:2<br>
Bit depth : 8
bits<br>
Scan type :
Progressive<br>
Compression mode :
Lossless<br>
Bits/(Pixel*Frame) :
2.225<br>
Stream size :
55.0 MiB (95%)<br>
Writing library :
Lavc61.19.101 ffv1<br>
Default : No<br>
Forced : No<br>
Color range :
Limited<br>
coder_type :
Golomb Rice<br>
ErrorDetectionType : Per
slice<br>
<br>
Audio<br>
ID : 2<br>
Format : PCM<br>
Format settings :
Little / Signed<br>
Codec ID :
A_PCM/INT/LIT<br>
Duration : 10
s 0 ms<br>
Bit rate mode :
Constant<br>
Bit rate : 1
536 kb/s<br>
Channel(s) : 2
channels<br>
Sampling rate :
48.0 kHz<br>
Bit depth : 16
bits<br>
Stream size :
1.83 MiB (3%)<br>
Writing library :
Lavc61.19.101 pcm_s16le<br>
Default : No<br>
Forced : No<br>
</blockquote>
---------------------------------<br>
<br>
As seen above the "default" Chroma subsampling
is yuv422p or 4:2:2 with Bit depth: 8 bits<br>
<br>
As ffv1 seemingly also does support yuv422p10le
ffmpeg, I wonder if yuv422p is limited by the
input from HDMI capture/AV converter?<br>
Can possibly yuv422p10le possibly be achieved by
adding -pix_fmt 10 og similar syntax to the
ffmpeg line?<br>
</div>
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<div dir="auto"><br>
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<div dir="auto">you can try different -input_format,
but I suspect 10bit video over v4l2 at best uncommon
... While hdmi itself supports 10bit digital signal, I
suspect non-pro capture devices usually limited to
8bit?</div>
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<blockquote type="cite"
cite="mid:CA+rFky47GPyz_aj3WYnzRxEbCqo+uqpmX71-2e5EMEf7MHCHKQ@mail.gmail.com">
<div dir="auto">
<div dir="auto"><a
href="https://git.ffmpeg.org/gitweb/ffmpeg.git/blob/HEAD:/libavdevice/v4l2-common.c"
moz-do-not-send="true" class="moz-txt-link-freetext">https://git.ffmpeg.org/gitweb/ffmpeg.git/blob/HEAD:/libavdevice/v4l2-common.c</a></div>
<div dir="auto"><br>
</div>
<div dir="auto">I can't see 10bit yuy2 format listed here, so
probably even if hw/driver support it ffmpeg will not ...</div>
</div>
</blockquote>
<br>
Yes, It seems this also is the case. <br>
Even I got a few 10-bits "-input_format" y210 and p210 accepted by
ffmpeg, in both cases the output format "defaulted" to the same
'yuv422p'.<br>
What also surprised me, the filesizes at the same time also was
reduced to 77%<br>
<br>
du -sh *<br>
45M 720x576_50fps_p210+alsa_ms2130_ffv1-3+pcm.mkv<br>
45M 720x576_50fps_y210+alsa_ms2130_ffv1-3+pcm.mkv<br>
58M 720x576_50fps_yuyv422+alsa_ms2130_ffv1-3+pcm.mkv<br>
<br>
<br>
<blockquote type="cite"
cite="mid:CA+rFky47GPyz_aj3WYnzRxEbCqo+uqpmX71-2e5EMEf7MHCHKQ@mail.gmail.com">
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<div dir="auto">But of course you better to doublecheck
what v4l2 tools says ...</div>
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</blockquote>
<br>
So far no other pixel formats found:<br>
<br>
v4l2-ctl -V <br>
Format Video Capture:<br>
Width/Height : 720/576<br>
Pixel Format : 'YUYV' (YUYV 4:2:2)<br>
Field : None<br>
Bytes per Line : 1440<br>
Size Image : 829440<br>
Colorspace : sRGB<br>
Transfer Function : Rec. 709<br>
YCbCr/HSV Encoding: ITU-R 601<br>
Quantization : Default (maps to Limited Range)<br>
Flags : <br>
<br>
<br>
<br>
<blockquote type="cite"
cite="mid:CA+rFky47GPyz_aj3WYnzRxEbCqo+uqpmX71-2e5EMEf7MHCHKQ@mail.gmail.com">
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<div dir="auto"><br>
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<div dir="auto">Sorry for "too generic" answer, few
years ago I/we looked into "direct RF capture" and
there getting 10bit signal was possible, with custom
hardware, slow offline processing and invasive hoockup
to VCR's internals.</div>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote>
<br>
Similar I bought and captured a few ProRes422 HQ few files in 2016
with Blackmagic Design's HyperDeck Shuttle+AD miniconverter+SSD
recorder.<br>
But some years later, BMD's fw support became EOL, and the devices
became non-working :(<br>
<br>
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<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
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