<div dir="auto"><div><br><br><div class="gmail_quote gmail_quote_container"><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">cin@lists.cinelerra-gg.org</a>>:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u>
<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" target="_blank" rel="noreferrer">https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg05547.html</a><br>
<a href="https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg03791.html" target="_blank" rel="noreferrer">https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg03791.html</a><br>
<a href="https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg05547.html" target="_blank" rel="noreferrer">https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg05547.html</a><br>
<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></blockquote></div></div><div dir="auto"><br></div><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><div dir="auto"><br></div><div dir="auto">But of course you better to doublecheck what v4l2 tools says ...</div><div dir="auto"><br></div><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 dir="auto"><br></div><div dir="auto"><div class="gmail_quote gmail_quote_container"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>
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</blockquote></div></div></div>