Den 05.05.2025 16:05, skrev Andrew Randrianasulu:
пн, 5 мая 2025 г., 17:00 Andrew Randrianasulu <randrianas...@gmail.com>:
пн, 5 мая 2025 г., 16:26 Terje J. Hanssen via Cin
<cin@lists.cinelerra-gg.org>:
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.
Related previous threads
https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg05547.html
https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg03791.html
https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg05547.html
I adapt simply the last ffmpeg mpeg-2 code line to a first
ffv1, version 3 test, 10 sec file
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
Input #0, video4linux2,v4l2, from '/dev/video0':
Duration: N/A, start: 351.803278, bitrate: 331776 kb/s
Stream #0:0: Video: rawvideo (YUY2 / 0x32595559),
yuyv422, 720x576, 331776 kb/s, 50 fps, 50 tbr, 1000k tbn
[aist#1:0/pcm_s16le @ 0x555a99736cc0] Guessed Channel
Layout: stereo
Input #1, alsa, from 'hw:CARD=UHD,DEV=0':
Duration: N/A, start: 1746445045.742179, 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) -> ffv1 (native))
Stream #1:0 -> #0:1 (pcm_s16le (native) -> pcm_s16le
(native))
Press [q] to stop, [?] for help
Output #0, matroska, to
'720x576_50fps+alsa_ms2130_ffv1-3+pcm.mkv':
Metadata:
encoder : Lavf61.7.100
Stream #0:0: Video: ffv1 (FFV1 / 0x31564646),
yuv422p(tv, progressive), 720x576, q=2-31, 200 kb/s, 50
fps, 1k tbn
Metadata:
encoder : Lavc61.19.101 ffv1
Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001),
48000 Hz, stereo, s16, 1536 kb/s
Metadata:
encoder : Lavc61.19.101 pcm_s16le
[out#0/matroska @ 0x555a99736f40] video:57467KiB
audio:1875KiB subtitle:0KiB other streams:0KiB global
headers:0KiB muxing overhead: 0.069226%
frame= 500 fps= 50 q=-0.0 Lsize= 59383KiB
time=00:00:10.00 bitrate=48646.9kbits/s speed=0.998x
----------
du -sh *
58M 720x576_50fps+alsa_ms2130_ffv1-3+pcm.mkv
----------
ffprobe -hide_banner 720x576_50fps+alsa_ms2130_ffv1-3+pcm.mkv
Input #0, matroska,webm, from
'720x576_50fps+alsa_ms2130_ffv1-3+pcm.mkv':
Metadata:
ENCODER : Lavf61.7.100
Duration: 00:00:10.00, start: 0.000000, bitrate: 48646 kb/s
Stream #0:0: Video: ffv1 (FFV1 / 0x31564646),
yuv422p(tv, progressive), 720x576, 50 fps, 50 tbr, 1k tbn
Metadata:
ENCODER : Lavc61.19.101 ffv1
DURATION : 00:00:10.000000000
Stream #0:1: Audio: pcm_s16le, 48000 Hz, 2 channels,
s16, 1536 kb/s
Metadata:
ENCODER : Lavc61.19.101 pcm_s16le
DURATION : 00:00:10.000000000
------------
mediainfo 720x576_50fps+alsa_ms2130_ffv1-3+pcm.mkv
General
Unique ID :
158479793538002634101121179263279280827
(0x773A19163BEA6038DF448CE1529BB2BB)
Complete name :
720x576_50fps+alsa_ms2130_ffv1-3+pcm.mkv
Format : Matroska
Format version : Version 4
File size : 58.0 MiB
Duration : 10 s 0 ms
Overall bit rate mode : Variable
Overall bit rate : 48.6 Mb/s
Frame rate : 50.000 FPS
Writing application : Lavf61.7.100
Writing library : Lavf61.7.100
ErrorDetectionType : Per level 1
Video
ID : 1
Format : FFV1
Format version : Version 3.4
Format settings, Slice count : 4 slices per frame
Codec ID : V_MS/VFW/FOURCC
/ FFV1
Duration : 10 s 0 ms
Bit rate mode : Variable
Bit rate : 46.1 Mb/s
Width : 720 pixels
Height : 576 pixels
Display aspect ratio : 5:4
Frame rate mode : Constant
Frame rate : 50.000 FPS
Color space : YUV
Chroma subsampling : 4:2:2
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossless
Bits/(Pixel*Frame) : 2.225
Stream size : 55.0 MiB (95%)
Writing library : Lavc61.19.101 ffv1
Default : No
Forced : No
Color range : Limited
coder_type : Golomb Rice
ErrorDetectionType : Per slice
Audio
ID : 2
Format : PCM
Format settings : Little / Signed
Codec ID : A_PCM/INT/LIT
Duration : 10 s 0 ms
Bit rate mode : Constant
Bit rate : 1 536 kb/s
Channel(s) : 2 channels
Sampling rate : 48.0 kHz
Bit depth : 16 bits
Stream size : 1.83 MiB (3%)
Writing library : Lavc61.19.101
pcm_s16le
Default : No
Forced : No
---------------------------------
As seen above the "default" Chroma subsampling is yuv422p or
4:2:2 with Bit depth: 8 bits
As ffv1 seemingly also does support yuv422p10le ffmpeg, I
wonder if yuv422p is limited by the input from HDMI capture/AV
converter?
Can possibly yuv422p10le possibly be achieved by adding
-pix_fmt 10 og similar syntax to the ffmpeg line?
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?
https://git.ffmpeg.org/gitweb/ffmpeg.git/blob/HEAD:/libavdevice/v4l2-common.c
I can't see 10bit yuy2 format listed here, so probably even if
hw/driver support it ffmpeg will not ...
Yes, It seems this also is the case.
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'.
What also surprised me, the filesizes at the same time also was reduced
to 77%
du -sh *
45M 720x576_50fps_p210+alsa_ms2130_ffv1-3+pcm.mkv
45M 720x576_50fps_y210+alsa_ms2130_ffv1-3+pcm.mkv
58M 720x576_50fps_yuyv422+alsa_ms2130_ffv1-3+pcm.mkv
But of course you better to doublecheck what v4l2 tools says ...
So far no other pixel formats found:
v4l2-ctl -V
Format Video Capture:
Width/Height : 720/576
Pixel Format : 'YUYV' (YUYV 4:2:2)
Field : None
Bytes per Line : 1440
Size Image : 829440
Colorspace : sRGB
Transfer Function : Rec. 709
YCbCr/HSV Encoding: ITU-R 601
Quantization : Default (maps to Limited Range)
Flags :
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.
Similar I bought and captured a few ProRes422 HQ few files in 2016 with
Blackmagic Design's HyperDeck Shuttle+AD miniconverter+SSD recorder.
But some years later, BMD's fw support became EOL, and the devices
became non-working :(
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