<div dir="auto"><div><br><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">ср, 8 февр. 2023 г., 04:08 Terje J. Hanssen <<a href="mailto:terjejhanssen@gmail.com">terjejhanssen@gmail.com</a>>:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<br>
<br>
<div>Den 08.02.2023 00:52, skrev Andrew
Randrianasulu:<br>
</div>
<blockquote type="cite">
<div dir="auto">
<div><br>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">ср, 8 февр. 2023 г., 01:35
Terje J. Hanssen via Cin <<a href="mailto:cin@lists.cinelerra-gg.org" target="_blank" rel="noreferrer">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">
<div> <br>
<br>
<div>Den 02.02.2023 01:46, skrev Terje J. Hanssen:<br>
</div>
<blockquote type="cite"> <font face="Courier New,
Courier, monospace"><font face="Courier New,
Courier, monospace">.......</font></font><font face="Courier New, Courier, monospace"><br>
</font></blockquote>
<br>
<blockquote type="cite"><font face="Courier New,
Courier, monospace"> but I prepare myself to test
and use one method left with regards to "Personal
Video Archiving".<br>
<br>
Therefore I have ordered two selected, inexpensive
devices (the urls here are just for English
language):<br>
<br>
1) Capture Card USB HDMI 4K to 1080P USB-C adapter
(Speedy USB 3.2/3.1/3.0, </font><font face="Courier
New, Courier, monospace"><font face="Courier New,
Courier, monospace">60 Hz and 1080p FHD.</font>)<br>
<a href="https://www.turascandinavia.com/en/products/computer/microphone-webcam/webcams/74257" rel="noreferrer noreferrer" target="_blank">https://www.turascandinavia.com/en/products/computer/microphone-webcam/webcams/74257</a><br>
</font>
<ul>
<li><font face="Courier New, Courier, monospace">Fluid
video recordings without delays or distortions
during live streaming</font></li>
<li><font face="Courier New, Courier, monospace">Linux
not mentioned, but assumed this is a standard
supported UVC. OBS and VLC is mentioned.</font></li>
</ul>
</blockquote>
<br>
<font face="monospace">Then the first item, Hama Video
Recording Stick, HDMI 4k - USB3.x is received. It
promises: <br>
"Fluid video recordings without delays or distortions
during live streaming, thanks to a picture frequency
of 60 Hz and 1080p with Full HD. Transform
high-quality video cameras into a high-resolution USB
web camera".<br>
<br>
I have done a quick, first test using my Sony HDR-FX7E
camera. This is a HDV 1080i camcorder with MPEG-2
video compression at 25 mbps on tape 1440x1080,
50i25fps, 4:2:0 and MP2 stereo audio. Currently it's
cassette deck is broken and needs repair service. <br>
<br>
But according to Steve Mullen's V1 and FX7 handbook
(not mentioned in the manual):<br>
</font>
<blockquote><font face="monospace">1. When the camera is
operating, the EIP (Enhanced Image Processor)
generates uncompressed 1440x1080i with a 4:2:2 color
space. </font><font face="monospace">Digital 4:2:2
data are output via the HDMI port while 4:2:2 analog
is output via component-out. Therefore, you can
record 4:2:2 live HD video from the camera without
MPEG-2 compression. V1 and FX7 provide an HDMI
output port that carries uncompressed 4:2:2, 8-bit,
digital video plus dual-channel, PCM, 16-bit, 48kHz
audio When the camera is running. </font><br>
<br>
<font face="monospace">2. If you are playing a 1080i50
or 1080i60 HDV tape. The 4:2:0 MPEG-2 is decoded and
chroma up-scaled to a 4:2:2. The HDMI</font><br>
<font face="monospace">chip downscales 1440 to 1280
while it up-scales 540 to 720. The result is 720p50
or 720p60, which is output via HDMI.<br>
</font></blockquote>
<font face="monospace">That is, I have tested section 1
now, but see now that I didn't test 1440x1080
resolution. The only resolution I got to work at 25
fps was 720x576 (SD), while HD 1280x720 and FHD
1920x1080 were set down to 10 fps and 5 fps
respectively by the driver and caused jumpy playback.<br>
</font></div>
</blockquote>
</div>
</div>
<div dir="auto"><br>
</div>
<div dir="auto">Did you tried to force specific format
(uncompressed) before -i parameter for ffmpeg? </div>
</div>
</blockquote>
<br>
Just "-framerate 25 -video_size 1920x1080" before -i as repeated in
the code as follows, where I tested to encode to uncompressed v210
instead of ffv1, but with no change with regards to low 5 fps:<br>
<br>
ffmpeg -hide_banner -f v4l2 -framerate 25 -video_size 1920x1080 -i
/dev/video0 -codec:v v210 -codec:a pcm_s16le -f matroska
1920x1080_v210.mkv<br>
[video4linux2,v4l2 @ 0x55944900e0c0] The driver changed the time per
frame from 1/25 to 1/5<br>
<br>
I also read a related issue and reply to this post at Superuser,
where 1920x1080 was not supported on the webcam.<br>
<a href="https://superuser.com/questions/1449252/ffmpeg-captures-from-uvc-dev-video0-in-any-resolution-except-for-1920x1080" target="_blank" rel="noreferrer">https://superuser.com/questions/1449252/ffmpeg-captures-from-uvc-dev-video0-in-any-resolution-except-for-1920x1080</a><br>
<br>
<blockquote type="cite">
<div dir="auto">
<div dir="auto">Also look out for usb2 vs usb3 ports? Shouldn't
capture device hang on bus 002 (usb 3.0) root hub, instead of
bus 001 (usb 2.0 root hub), from lsusb below?</div>
</div>
</blockquote>
<br>
This may well work better. I have to admit that I have never studied
the difference between shared usb buses. My thought was to try to
change the connected usb devices, but tested first the only free
usb3 port (blue) on the add-on frontpanel of the workstation. The
other two usb3 ports are on the backpanel and are used for the Asus
blu-ray burner and 8TB Seagate expansion video disc. <br>
<br>
The other usb ports on both panels are usb2 ports, whereof two for
the wireless keyboard and mouse on the fronpanel. What I possibly
already have mentioned before, is that sometimes if I connect a
usb(2) device or memory to the usb3 port on the frontpanel, this
cause hang on the keyboard or mouse. But this didn't happend this
time with the USB3 capture stick.<br>
<br>
<blockquote type="cite">
<div dir="auto">
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
<div dir="auto">
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><font face="monospace"> <br>
Someone here that have suggestion to possibly modified
syntax or can verify that the driver doesn't manage
this?<br>
<br>
Another (setup) problem, there was no audio recorded
or heard during playback!?<br>
<br>
In the following I list the test command syntax I've
collectedf and tried with shortened output (yet long):<br>
To explain, I have also another USB 2.0 Webcam
connected, beside the new HDMI-USB3 Videstick.<br>
<br>
Verify the devices, drivers and formats:<br>
---------------------------------------<br>
dmesg | tail<br>
[22706.060759] perf: interrupt took too long (2521
> 2500), lowering kernel.perf_event_max_sample_rate
to 79250<br>
[32105.561575] perf: interrupt took too long (3158
> 3151), lowering kernel.perf_event_max_sample_rate
to 63250<br>
[40586.477420] usb 1-5: USB disconnect, device number
2<br>
[40599.099612] usb 1-5: new high-speed USB device
number 5 using xhci_hcd<br>
[40599.250960] usb 1-5: New USB device found,
idVendor=534d, idProduct=2109, bcdDevice=21.00<br>
[40599.250972] usb 1-5: New USB device strings: Mfr=1,
Product=2, SerialNumber=0<br>
[40599.250978] usb 1-5: Product: USB Video<br>
[40599.250984] usb 1-5: Manufacturer: MACROSILICON<br>
[40599.252310] usb 1-5: Found UVC 1.00 device USB
Video (534d:2109)<br>
[40599.256234] hid-generic 0003:534D:2109.0006:
hiddev96,hidraw0: USB HID v1.10 Device [MACROSILICON
USB Video] on usb-0000:00:14.0-5/input4<br>
-----------------------------<br>
<br>
lsusb<br>
Bus 002 Device 003: ID 05e3:0732 Genesys Logic, Inc.
All-in-One Cardreader<br>
Bus 002 Device 002: ID 0bc2:2038 Seagate RSS LLC
Expansion HDD<br>
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0
root hub<br>
Bus 001 Device 003: ID 046d:c534 Logitech, Inc.
Unifying Receiver<br>
Bus 001 Device 005: ID 534d:2109 MacroSilicon USB
Video<br>
Bus 001 Device 004: ID 0c45:6340 Microdia Camera<br>
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0
root hub<br>
<br>
<br>
udevadm info /dev/video* | egrep
'DEVNAME|ID_V4L_PRODUCT'<br>
E: DEVNAME=/dev/video0<br>
E: ID_V4L_PRODUCT=USB Video: USB Video<br>
E: DEVNAME=/dev/video1<br>
E: ID_V4L_PRODUCT=USB Video: USB Video<br>
E: DEVNAME=/dev/video2<br>
E: ID_V4L_PRODUCT=USB 2.0 Camera: HD 720P Webcam<br>
E: DEVNAME=/dev/video3<br>
E: ID_V4L_PRODUCT=USB 2.0 Camera: HD 720P Webcam<br>
<br>
lsusb | egrep 'Video|Camera'<br>
Bus 001 Device 005: ID 534d:2109 MacroSilicon USB
Video<br>
Bus 001 Device 004: ID 0c45:6340 Microdia Camera<br>
<br>
--------------------<br>
<br>
ll /dev/video*<br>
crw-rw----+ 1 root video 81, 0 feb. 7 20:22
/dev/video0<br>
crw-rw----+ 1 root video 81, 1 feb. 7 20:22
/dev/video1<br>
crw-rw----+ 1 root video 81, 2 feb. 7 09:05
/dev/video2<br>
crw-rw----+ 1 root video 81, 3 feb. 7 09:05
/dev/video3<br>
<br>
-----------------------<br>
<br>
v4l2-ctl --list-devices<br>
USB 2.0 Camera: HD 720P Webcam (usb-0000:00:14.0-11):<br>
/dev/video2<br>
/dev/video3<br>
<br>
USB Video: USB Video (usb-0000:00:14.0-5):<br>
/dev/video0<br>
/dev/video1<br>
<br>
-------------------------<br>
<br>
ffmpeg -f v4l2 -list_formats all -i /dev/video0<br>
ffmpeg -hide_banner -f v4l2 -list_formats all -i
/dev/video0<br>
[video4linux2,v4l2 @ 0x556cf63570c0] Compressed:
mjpeg : Motion-JPEG : 1920x1080 1600x1200
1360x768 1280x1024 1280x960 1280x720 1024x768 800x600
720x576 720x480 640x480<br>
[video4linux2,v4l2 @ 0x556cf63570c0] Raw :
yuyv422 : YUYV 4:2:2 : 1920x1080 1600x1200
1360x768 1280x1024 1280x960 1280x720 1024x768 800x600
720x576 720x480 640x480<br>
/dev/video0: Immediate exit requested<br>
<br>
ffmpeg -hide_banner -f v4l2 -list_formats all -i
/dev/video1<br>
[video4linux2,v4l2 @ 0x5560c0bc70c0]
ioctl(VIDIOC_G_INPUT): Inappropriate ioctl for device<br>
/dev/video1: Inappropriate ioctl for device<br>
----------------<br>
<br>
v4l2-ctl --all<br>
Driver Info (not using libv4l2):<br>
Driver name : uvcvideo<br>
Card type : USB Video: USB Video<br>
Bus info : usb-0000:00:14.0-5<br>
Driver version: 5.14.21<br>
Capabilities : 0x84A00001<br>
Video Capture<br>
Metadata Capture<br>
Streaming<br>
Extended Pix Format<br>
Device Capabilities<br>
Device Caps : 0x04200001<br>
Video Capture<br>
Streaming<br>
Extended Pix Format<br>
Priority: 2<br>
Video input : 0 (Camera 1: ok)<br>
Format Video Capture:<br>
Width/Height : 1920/1080<br>
Pixel Format : 'MJPG'<br>
Field : None<br>
Bytes per Line : 0<br>
Size Image : 4147200<br>
Colorspace : sRGB<br>
Transfer Function : Rec. 709<br>
YCbCr/HSV Encoding: ITU-R 601<br>
Quantization : Default (maps to Full
Range)<br>
Flags : <br>
Crop Capability Video Capture:<br>
Bounds : Left 0, Top 0, Width 1920,
Height 1080<br>
Default : Left 0, Top 0, Width 1920,
Height 1080<br>
Pixel Aspect: 1/1<br>
Selection: crop_default, Left 0, Top 0, Width 1920,
Height 1080<br>
Selection: crop_bounds, Left 0, Top 0, Width 1920,
Height 1080<br>
Streaming Parameters Video Capture:<br>
Capabilities : timeperframe<br>
Frames per second: 30.000 (30/1)<br>
Read buffers : 0<br>
brightness 0x00980900 (int) :
min=-128 max=127 step=1 default=-11 value=-11<br>
contrast 0x00980901 (int) :
min=0 max=255 step=1 default=148 value=148<br>
saturation 0x00980902 (int) :
min=0 max=255 step=1 default=180 value=180<br>
hue 0x00980903 (int) :
min=-128 max=127 step=1 default=0 value=0<br>
<br>
-----------------<br>
<br>
v4l2-ctl --list-formats-ext<br>
ioctl: VIDIOC_ENUM_FMT<br>
Index : 0<br>
Type : Video Capture<br>
Pixel Format: 'MJPG' (compressed)<br>
Name : Motion-JPEG<br>
Size: Discrete 1920x1080<br>
Interval: Discrete 0.017s
(60.000 fps)<br>
Interval: Discrete 0.033s
(30.000 fps)<br>
Interval: Discrete 0.040s
(25.000 fps)<br>
Interval: Discrete 0.050s
(20.000 fps)<br>
Interval: Discrete 0.100s
(10.000 fps)<br>
.........<br>
Size: Discrete 1280x720<br>
Interval: Discrete 0.017s
(60.000 fps)<br>
Interval: Discrete 0.020s
(50.000 fps)<br>
Interval: Discrete 0.033s
(30.000 fps)<br>
Interval: Discrete 0.050s
(20.000 fps)<br>
Interval: Discrete 0.100s
(10.000 fps)<br>
......<br>
Size: Discrete 720x576<br>
Interval: Discrete 0.017s
(60.000 fps)<br>
Interval: Discrete 0.020s
(50.000 fps)<br>
Interval: Discrete 0.033s
(30.000 fps)<br>
Interval: Discrete 0.050s
(20.000 fps)<br>
Interval: Discrete 0.100s
(10.000 fps)<br></font></div></blockquote></div></div></div></blockquote></div></blockquote></div></div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto">well, it seems we know by now why this device was ...unexpensive.</div><div dir="auto"><br></div><div dir="auto">it really seems to report only 5-10 fps at fullHD uncompresed, anything bigger is mjpeg ...</div><div dir="auto"><br></div><div dir="auto"><a href="https://superuser.com/questions/1449252/ffmpeg-captures-from-uvc-dev-video0-in-any-resolution-except-for-1920x1080">https://superuser.com/questions/1449252/ffmpeg-captures-from-uvc-dev-video0-in-any-resolution-except-for-1920x1080</a><br></div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><blockquote type="cite"><div dir="auto"><div dir="auto"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><font face="monospace">
<br>
Index : 1<br>
Type : Video Capture<br>
Pixel Format: 'YUYV'<br>
Name : YUYV 4:2:2<br>
Size: Discrete 1920x1080<br>
Interval: Discrete 0.200s
(5.000 fps)<br>
......<br>
Size: Discrete 1280x720<br>
Interval: Discrete 0.100s
(10.000 fps)<br>
.......<br>
Size: Discrete 720x576<br>
Interval: Discrete 0.040s
(25.000 fps)<br>
Interval: Discrete 0.050s
(20.000 fps)<br>
Interval: Discrete 0.100s
(10.000 fps)<br>
Interval: Discrete 0.200s
(5.000 fps)<br>
.........<br>
<br>
Encoding:<br>
--------<br>
ffmpeg -hide_banner -f v4l2 -framerate 25 -video_size
720x576 -i /dev/video0 -codec:v ffv1 -codec:a
pcm_s16le -f matroska 720x576_ffv1.mkv<br>
<br>
ffmpeg -hide_banner -f v4l2 -framerate 25 -video_size
1280x720 -i /dev/video0 -codec:v ffv1 -codec:a
pcm_s16le -f matroska 1280x720_ffv1.mkv<br>
[video4linux2,v4l2 @ 0x559d031190c0] The driver
changed the time per frame from 1/25 to 1/10<br>
<br>
ffmpeg -hide_banner -f v4l2 -framerate 25 -video_size
1920x1080 -i /dev/video0 -codec:v ffv1 -codec:a
pcm_s16le -f matroska 1920x1080_ffv1.mkv<br>
[video4linux2,v4l2 @ 0x55ce18d060c0] The driver
changed the time per frame from 1/25 to 1/5<br>
<br>
ffmpeg -hide_banner -f v4l2 -framerate 25 -video_size
1920x1080 -i /dev/video0 -codec:v v210 -codec:a
pcm_s16le -f matroska 1920x1080_v210.mkv<br>
[video4linux2,v4l2 @ 0x55944900e0c0] The driver
changed the time per frame from 1/25 to 1/5<br>
<br>
<br>
Recorded test video files and probing formats:<br>
---------------------------------------------<br>
<br>
du -sh *<br>
258M 1280x720_ffv1.mkv<br>
292M 1920x1080_ffv1.mkv<br>
1,1G 1920x1080_v210.mkv<br>
61M 720x576_ffv1.mkv<br>
-----------------------------<br>
<br>
<br>
ffprobe -hide_banner 720x576_ffv1.mkv<br>
Input #0, matroska,webm, from '720x576_ffv1.mkv':<br>
Metadata:<br>
ENCODER : Lavf58.76.100<br>
Duration: 00:00:09.20, start: 0.000000, bitrate:
55385 kb/s<br>
Stream #0:0: Video: ffv1 (FFV1 / 0x31564646),
yuv422p(tv, progressive), 720x576, 25 fps, 25 tbr, 1k
tbn, 1k tbc (default)<br>
Metadata:<br>
ENCODER : Lavc58.134.100 ffv1<br>
DURATION : 00:00:09.200000000<br>
-----------<br>
<br>
ffprobe -hide_banner 1280x720_ffv1.mkv<br>
Input #0, matroska,webm, from '1280x720_ffv1.mkv':<br>
Metadata:<br>
ENCODER : Lavf58.76.100<br>
Duration: 00:00:38.90, start: 0.000000, bitrate:
55512 kb/s<br>
Stream #0:0: Video: ffv1 (FFV1 / 0x31564646),
yuv422p(tv, progressive), 1280x720, 10 fps, 10 tbr, 1k
tbn, 1k tbc (default)<br>
Metadata:<br>
ENCODER : Lavc58.134.100 ffv1<br>
DURATION : 00:00:38.900000000<br>
--------------<br>
<br>
ffprobe -hide_banner 1920x1080_ffv1.mkv<br>
Input #0, matroska,webm, from '1920x1080_ffv1.mkv':<br>
Metadata:<br>
ENCODER : Lavf58.76.100<br>
Duration: 00:00:53.40, start: 0.000000, bitrate:
45747 kb/s<br>
Stream #0:0: Video: ffv1 (FFV1 / 0x31564646),
yuv422p(tv, progressive), 1920x1080, 5 fps, 5 tbr, 1k
tbn, 1k tbc (default)<br>
Metadata:<br>
ENCODER : Lavc58.134.100 ffv1<br>
DURATION : 00:00:53.400000000<br>
----------------<br>
<br>
ffprobe -hide_banner 1920x1080_v210.mkv<br>
[matroska,webm @ 0x5563ca6d30c0] Stream #0: not enough
frames to estimate rate; consider increasing probesize<br>
Input #0, matroska,webm, from '1920x1080_v210.mkv':<br>
Metadata:<br>
ENCODER : Lavf58.76.100<br>
Duration: 00:00:41.40, start: 0.000000, bitrate:
221185 kb/s<br>
Stream #0:0: Video: v210 (v210 / 0x30313276),
yuv422p10le(tv, progressive), 1920x1080, 5 fps, 1k
tbr, 1k tbn, 1k tbc (default)<br>
Metadata:<br>
ENCODER : Lavc58.134.100 v210<br>
DURATION : 00:00:41.400000000<br>
<br>
---------------------------<br>
<br>
</font><br>
<blockquote type="cite">
<ul>
</ul>
<font face="Courier New, Courier, monospace"><br>
2) Scart AV SV to HDMI Converter Switcher S Video
Composite RCA DVD HD TV adapter (3-4 weeks delivery
time <br>
<a href="https://www.ebay.com.au/itm/295472602625" rel="noreferrer noreferrer" target="_blank">https://www.ebay.com.au/itm/295472602625</a><br>
</font>
<ul>
<li><font face="Courier New, Courier, monospace">The
3-in-1 S-/video/RCA/SCART to HDMI converter is a
universal converter for analog video input to
HDMI output. </font></li>
<li><font face="Courier New, Courier, monospace">Analog
to digital converter (ADC), 10 bits maximum 1,62
MSPS sampling, </font></li>
</ul>
<font face="Courier New, Courier, monospace"><br>
<br>
Q I have not yet found a definitiv ffmpeg FFV1 v 3
syntax guide for SD and HDV capturing and hope for
suggestions and comments here!?<br>
<br>
3.1 FFmpeg recipe (PAL)<br>
</font>
<blockquote><font face="Courier New, Courier,
monospace">ffmpeg -i VIDEO_IN \</font><br>
<blockquote><font face="Courier New, Courier,
monospace">-c:v ffv1 -level 3 -coder 1 -context
0 -slices 24 -slicecrc 1 \</font><br>
<font face="Courier New, Courier, monospace">-color_primaries
bt470bg \</font><br>
<font face="Courier New, Courier, monospace">-color_trc
bt709 \</font><br>
<font face="Courier New, Courier, monospace">-colorspace
bt470bg \</font><br>
<font face="Courier New, Courier, monospace">-color_range
mpeg \</font><br>
<font face="Courier New, Courier, monospace">-map
0 \</font><br>
<font face="Courier New, Courier, monospace">-top
1 \</font><br>
<font face="Courier New, Courier, monospace">-c:a
copy \</font><br>
<font face="Courier New, Courier, monospace">-g 1
-pix_fmt + \</font><br>
<font face="Courier New, Courier, monospace">VIDEO_OUT.mkv</font><br>
</blockquote>
</blockquote>
<font face="Courier New, Courier, monospace"><br>
3.2 Reference Example<br>
<a href="https://trac.ffmpeg.org/wiki/Encode/FFV1" rel="noreferrer noreferrer" target="_blank">https://trac.ffmpeg.org/wiki/Encode/FFV1</a><br>
<br>
Copy audio "as-is" and use FFV1.3 as video
codec. <br>
<br>
Parameters are 8 threads, coder=1, context=1,
GOP-size=1, 24 slices and slice-CRC on:<br>
<br>
ffmpeg -i <input_video> \<br>
-acodec copy \<br>
-vcodec ffv1 -level 3 \<br>
-threads 8 \<br>
-coder 1 \<br>
-context 1 \<br>
-g 1 \<br>
-slices 24 \<br>
-slicecrc 1 \<br>
<output_video><br>
<br>
<br>
3.3 Various Encoding examples for Video capture from
USB camera /dev/video0:<br>
<br>
ffmpeg -f v4l2 -framerate 25 -video_size 720x576 -i
/dev/video0 output_data.mkv<br>
<br>
ffmpeg -f v4l2 -framerate 25 -video_size 720x576 -i
/dev/video0 -codec:v ffv1 -codec:a pcm_s16le \<br>
-f matroska output_video.mkv<br>
<br>
Check that video is captured properly using ffplay:<br>
<br>
ffmpeg -ar 44100 -thread_queue_size 1024 -f alsa -i
$AUDIO \<br>
-r 25 -thread_queue_size 1024 -i $VIDEO \<br>
-codec copy -f matroska - | ffplay -<br>
</font><font face="Courier"><span><br>
</span></font><font face="Courier New, Courier,
monospace"><span>Check the overall flow using ffplay
before capturing:</span> </font>
<div>
<div> <br>
</div>
</div>
<font face="Courier New, Courier, monospace">ffmpeg
-ar 44100 -thread_queue_size 1024 -f alsa -i $AUDIO
\<br>
-itsoffset -0.5 -r 25 -thread_queue_size 1024 -i
$VIDEO \<br>
-filter_complex 'channelmap=FL-0'
-filter_complex 'crop=w=700:h=556:x=8:y=0' \<br>
-map 1:v -map 0:a -codec:v ffv1 -codec:a
pcm_s16le \<br>
-f matroska - | ffplay -<br>
<br>
<br>
<br>
4, Regarding FFV1 lossless compression in realtime<br>
</font><font face="Courier New, Courier, monospace"><font face="Courier New, Courier, monospace">Comparison
tests (2013/2015) have shown that FFV1 produced
the smallest files at the fastest speed. It can be
used to capture SD material in realtime, and HD
possibly, too. </font></font><font face="Courier
New, Courier, monospace"><font face="Courier New,
Courier, monospace"><font face="Courier New,
Courier, monospace">This according to a
2012/2015 article, where I have extracted the
results for FFV1 v.3 in the tables below:<br>
<br>
<a href="http://www.av-rd.com/knowhow/video/comparison_video_codecs_containers.html#codec_tests" rel="noreferrer noreferrer" target="_blank">http://www.av-rd.com/knowhow/video/comparison_video_codecs_containers.html#codec_tests</a><br>
</font> </font></font> NOTE: This is a consumer
grade, off-the-shelf PC setup.<br>
<br>
<table>
<tbody>
<tr>
<th colspan="2">Hardware:</th>
</tr>
<tr>
<td>CPU:</td>
<td>Intel(R) QuadCore(TM) i7-2600K CPU @ 3.40GHz</td>
</tr>
<tr>
<td>RAM:</td>
<td>8 GB</td>
</tr>
<tr>
<td>Disk:</td>
<td>Intel SSDSA2CW080G3 (SSD)</td>
</tr>
<tr>
<th colspan="2">Software:</th>
</tr>
<tr>
<td>Operating System:</td>
<td>GNU/Linux (Xubuntu 12.04.1, 64bit)</td>
</tr>
<tr>
<td>Transcoding tool:</td>
<td>FFmpeg (version git N-59183-g3e62654, Dec 17
2013)</td>
</tr>
</tbody>
</table>
<br>
<table>
<tbody>
<tr>
<td>Video source file:</td>
<td colspan="6"> <a href="http://media.xiph.org/video/derf/y4m/football_422_ntsc.y4m" rel="noreferrer noreferrer" target="_blank">VQEG reference video
"football"</a> (NTSC-SD, 720x486px, 30fps,
yuv422p, 8bpc) </td>
</tr>
<tr>
<th>Codec</th>
<th>Encoding</th>
<th>Decoding</th>
<th>Filesize</th>
<th>% of uncompressed</th>
<th>Implementation</th>
<th>Details</th>
</tr>
<tr>
<td><a href="http://www.av-rd.com/knowhow/video/comparison_video_codecs_containers.html#codec_ffv1" rel="noreferrer noreferrer" target="_blank">FFV1</a> (version 3)</td>
<td>216 fps</td>
<td>277 fps</td>
<td>111 MiB</td>
<td>46.1%</td>
<td><a href="http://en.wikipedia.org/wiki/Libavcodec" rel="noreferrer noreferrer" target="_blank">libavcodec (FFmpeg)</a></td>
<td> <a href="http://www.av-rd.com/knowhow/video/test_results/football-720x486i30/ffv1.3-libavcodec_ffmpeg_avi.log" type="text/plain" rel="noreferrer noreferrer" target="_blank">log</a>,
<a href="http://www.av-rd.com/knowhow/video/test_results/football-720x486i30/ffv1.3-libavcodec_ffmpeg_avi.framemd5" type="text/plain" rel="noreferrer noreferrer" target="_blank">framemd5</a></td>
</tr>
</tbody>
</table>
<font face="Courier New, Courier, monospace"> <br>
</font><br>
<table>
<tbody>
<tr>
<td>Video source file:</td>
<td colspan="6"> <a href="http://media.xiph.org/video/derf/y4m/park_joy_1080p50.y4m" rel="noreferrer noreferrer" target="_blank">SVT reference video
"park joy"</a> (full-HD/1080p, 1920x1080px,
50fps, yuv420p, 8bpc) </td>
</tr>
<tr>
<th>Codec</th>
<th>Encoding</th>
<th>Decoding</th>
<th>Filesize</th>
<th>% of uncompressed</th>
<th>Implementation</th>
<th>Details</th>
</tr>
<tr>
<td><a href="http://www.av-rd.com/knowhow/video/comparison_video_codecs_containers.html#codec_ffv1" rel="noreferrer noreferrer" target="_blank">FFV1</a> (version 3)</td>
<td>31 fps</td>
<td>63 fps</td>
<td>879 MiB</td>
<td>57.2%</td>
<td><a href="http://en.wikipedia.org/wiki/Libavcodec" rel="noreferrer noreferrer" target="_blank">libavcodec (FFmpeg)</a></td>
<td> <a href="http://www.av-rd.com/knowhow/video/test_results/park_joy-1920x1080p50/ffv1.3-libavcodec_ffmpeg_avi.log" type="text/plain" rel="noreferrer noreferrer" target="_blank">log</a>,
<a href="http://www.av-rd.com/knowhow/video/test_results/park_joy-1920x1080p50/ffv1.3-libavcodec_ffmpeg_avi.framemd5" type="text/plain" rel="noreferrer noreferrer" target="_blank">framemd5</a></td>
</tr>
</tbody>
</table>
<font face="Courier New, Courier, monospace"> <br>
<br>
</font><br>
<font face="Courier New, Courier, monospace"><font face="Courier New, Courier, monospace"><font face="Courier New, Courier, monospace"><font face="Courier New, Courier, monospace">PAL-SD
720x576 </font><font face="Courier New,
Courier, monospace">stored as YUV422</font><font face="Courier New, Courier, monospace">, 10
bpc (bits per component), instead of the
tested 8 bpc above, seems to me would have
enlarged the the filesizes with about 25%, or
to about 40 GB/hr with FFV1 lossless
compressed. </font></font></font><br>
<br>
Although the FFV1 compression results above
obviously used yuv422p, 8bps source SD and FHD files
as input, it seems for me that the encoding speeds
at 216 fps and 31 fps for SD and FHD respectively,
assumingly should manage realtime FFV1 encoding and
streaming of PAL SD and HDV at 25 fps as well,
especially with a faster i7-6700 x 8 cpu. Comments
here?<br>
<br>
<br>
5. Related 2021-[Cin] threads as background
references<br>
<br>
[Cin] hdmi capture card (with v4l2)<br>
<a href="https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg02865.html" rel="noreferrer noreferrer" target="_blank">https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg02865.html</a><br>
<br>
[Cin] offtopic: Digitize and record Video with A/D
USB adapters<br>
<a href="https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg03269.html" rel="noreferrer noreferrer" target="_blank">https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg03269.html</a><br>
<br>
[Cin] offtopic: HDMI capture<br>
<a href="https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg02084.html" rel="noreferrer noreferrer" target="_blank">https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg02084.html</a><br>
<br>
[Cin] Is SD and HD 422 Video Capture obtainable with
V4L(2)?<br>
<a href="https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg03719.html" rel="noreferrer noreferrer" target="_blank">https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg03719.html</a><br>
<br>
[Cin] Uncompressed video to lossless compression
FFV1/MKV<br>
<a href="https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg03791.html" rel="noreferrer noreferrer" target="_blank">https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg03791.html</a><br>
</font> </blockquote>
<br>
</div>
-- <br>
Cin mailing list<br>
<a href="mailto:Cin@lists.cinelerra-gg.org" rel="noreferrer noreferrer" target="_blank">Cin@lists.cinelerra-gg.org</a><br>
<a href="https://lists.cinelerra-gg.org/mailman/listinfo/cin" rel="noreferrer noreferrer noreferrer" target="_blank">https://lists.cinelerra-gg.org/mailman/listinfo/cin</a><br>
</blockquote>
</div>
</div>
</div>
</blockquote>
<br>
</div>
</blockquote></div></div></div>