Den 08.02.2023 14:21, skrev Andrew Randrianasulu:


ср, 8 февр. 2023 г., 14:47 Terje J. Hanssen <[email protected]>:



    Den 08.02.2023 02:38, skrev Andrew Randrianasulu:


    ср, 8 февр. 2023 г., 04:08 Terje J. Hanssen
    <[email protected]>:



        Den 08.02.2023 00:52, skrev Andrew Randrianasulu:


        ср, 8 февр. 2023 г., 01:35 Terje J. Hanssen via Cin
        <[email protected]>:



            Den 02.02.2023 01:46, skrev Terje J. Hanssen:
            .......

            but I prepare myself to test and use one method left
            with regards to "Personal Video Archiving".

            Therefore I have ordered two selected, inexpensive
            devices (the urls here are just for English language):

            1) Capture Card USB HDMI 4K to 1080P USB-C adapter
            (Speedy USB 3.2/3.1/3.0, 60 Hz and 1080p FHD.)
            
https://www.turascandinavia.com/en/products/computer/microphone-webcam/webcams/74257

              * Fluid video recordings without delays or
                distortions during live streaming
              * Linux not mentioned, but assumed this is a standard
                supported UVC. OBS and VLC is mentioned.


            Then the first item, Hama Video Recording Stick, HDMI 4k
            - USB3.x is received. It promises:
            "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".

            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.

            But according to Steve Mullen's V1 and FX7 handbook (not
            mentioned in the manual):

                1. When the camera is operating, the EIP (Enhanced
                Image Processor) generates uncompressed 1440x1080i
                with a 4:2:2 color space. 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.

                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
                chip downscales 1440 to 1280 while it up-scales 540
                to 720. The result is 720p50 or 720p60, which is
                output via HDMI.

            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.


        Did you tried to force specific format (uncompressed) before
        -i parameter for ffmpeg?

        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:

        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
        [video4linux2,v4l2 @ 0x55944900e0c0] The driver changed the
        time per frame from 1/25 to 1/5

        I also read a related issue and reply to this post at
        Superuser, where 1920x1080 was not supported on the webcam.
        
https://superuser.com/questions/1449252/ffmpeg-captures-from-uvc-dev-video0-in-any-resolution-except-for-1920x1080

        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?

        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.

        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.




            Someone here that have suggestion to possibly modified
            syntax or can verify that the driver doesn't manage this?

            Another (setup) problem, there was no audio recorded or
            heard during playback!?

            In the following I list the test command syntax I've
            collectedf and tried with shortened output (yet long):
            To explain, I have also another USB 2.0 Webcam
            connected, beside the new HDMI-USB3 Videstick.

            Verify the devices, drivers and formats:
            ---------------------------------------
            dmesg | tail
            [22706.060759] perf: interrupt took too long (2521 >
            2500), lowering kernel.perf_event_max_sample_rate to 79250
            [32105.561575] perf: interrupt took too long (3158 >
            3151), lowering kernel.perf_event_max_sample_rate to 63250
            [40586.477420] usb 1-5: USB disconnect, device number 2
            [40599.099612] usb 1-5: new high-speed USB device number
            5 using xhci_hcd
            [40599.250960] usb 1-5: New USB device found,
            idVendor=534d, idProduct=2109, bcdDevice=21.00
            [40599.250972] usb 1-5: New USB device strings: Mfr=1,
            Product=2, SerialNumber=0
            [40599.250978] usb 1-5: Product: USB Video
            [40599.250984] usb 1-5: Manufacturer: MACROSILICON
            [40599.252310] usb 1-5: Found UVC 1.00 device USB Video
            (534d:2109)
            [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
            -----------------------------

            lsusb
            Bus 002 Device 003: ID 05e3:0732 Genesys Logic, Inc.
            All-in-One Cardreader
            Bus 002 Device 002: ID 0bc2:2038 Seagate RSS LLC
            Expansion HDD
            Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0
            root hub
            Bus 001 Device 003: ID 046d:c534 Logitech, Inc. Unifying
            Receiver
            Bus 001 Device 005: ID 534d:2109 MacroSilicon USB Video
            Bus 001 Device 004: ID 0c45:6340 Microdia Camera
            Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0
            root hub


            udevadm info  /dev/video* | egrep 'DEVNAME|ID_V4L_PRODUCT'
            E: DEVNAME=/dev/video0
            E: ID_V4L_PRODUCT=USB Video: USB Video
            E: DEVNAME=/dev/video1
            E: ID_V4L_PRODUCT=USB Video: USB Video
            E: DEVNAME=/dev/video2
            E: ID_V4L_PRODUCT=USB 2.0 Camera: HD 720P Webcam
            E: DEVNAME=/dev/video3
            E: ID_V4L_PRODUCT=USB 2.0 Camera: HD 720P Webcam

            lsusb | egrep 'Video|Camera'
            Bus 001 Device 005: ID 534d:2109 MacroSilicon USB Video
            Bus 001 Device 004: ID 0c45:6340 Microdia Camera

            --------------------

            ll /dev/video*
            crw-rw----+ 1 root video 81, 0 feb.   7 20:22 /dev/video0
            crw-rw----+ 1 root video 81, 1 feb.   7 20:22 /dev/video1
            crw-rw----+ 1 root video 81, 2 feb.   7 09:05 /dev/video2
            crw-rw----+ 1 root video 81, 3 feb.   7 09:05 /dev/video3

            -----------------------

            v4l2-ctl --list-devices
            USB 2.0 Camera: HD 720P Webcam (usb-0000:00:14.0-11):
                    /dev/video2
                    /dev/video3

            USB Video: USB Video (usb-0000:00:14.0-5):
                    /dev/video0
                    /dev/video1

            -------------------------

            ffmpeg -f v4l2 -list_formats all -i /dev/video0
            ffmpeg -hide_banner -f v4l2 -list_formats all -i /dev/video0
            [video4linux2,v4l2 @ 0x556cf63570c0] Compressed:      
            mjpeg :          Motion-JPEG : 1920x1080 1600x1200
            1360x768 1280x1024 1280x960 1280x720 1024x768 800x600
            720x576 720x480 640x480
            [video4linux2,v4l2 @ 0x556cf63570c0] Raw :     yuyv422
            :           YUYV 4:2:2 : 1920x1080 1600x1200 1360x768
            1280x1024 1280x960 1280x720 1024x768 800x600 720x576
            720x480 640x480
            /dev/video0: Immediate exit requested

            ffmpeg -hide_banner -f v4l2 -list_formats all -i /dev/video1
            [video4linux2,v4l2 @ 0x5560c0bc70c0]
            ioctl(VIDIOC_G_INPUT): Inappropriate ioctl for device
            /dev/video1: Inappropriate ioctl for device
            ----------------

            v4l2-ctl --all
            Driver Info (not using libv4l2):
                    Driver name   : uvcvideo
                    Card type     : USB Video: USB Video
                    Bus info      : usb-0000:00:14.0-5
                    Driver version: 5.14.21
                    Capabilities  : 0x84A00001
                            Video Capture
                            Metadata Capture
                            Streaming
                            Extended Pix Format
                            Device Capabilities
                    Device Caps   : 0x04200001
                            Video Capture
                            Streaming
                            Extended Pix Format
            Priority: 2
            Video input : 0 (Camera 1: ok)
            Format Video Capture:
                    Width/Height      : 1920/1080
                    Pixel Format      : 'MJPG'
                    Field             : None
                    Bytes per Line    : 0
                    Size Image        : 4147200
                    Colorspace        : sRGB
                    Transfer Function : Rec. 709
                    YCbCr/HSV Encoding: ITU-R 601
                    Quantization      : Default (maps to Full Range)
                    Flags             :
            Crop Capability Video Capture:
                    Bounds      : Left 0, Top 0, Width 1920, Height 1080
                    Default     : Left 0, Top 0, Width 1920, Height 1080
                    Pixel Aspect: 1/1
            Selection: crop_default, Left 0, Top 0, Width 1920,
            Height 1080
            Selection: crop_bounds, Left 0, Top 0, Width 1920,
            Height 1080
            Streaming Parameters Video Capture:
                    Capabilities     : timeperframe
                    Frames per second: 30.000 (30/1)
                    Read buffers     : 0
            brightness 0x00980900 (int) : min=-128 max=127 step=1
            default=-11 value=-11
            contrast 0x00980901 (int)    : min=0 max=255 step=1
            default=148 value=148
            saturation 0x00980902 (int) : min=0 max=255 step=1
            default=180 value=180
            hue 0x00980903 (int)    : min=-128 max=127 step=1
            default=0 value=0

            -----------------

            v4l2-ctl --list-formats-ext
            ioctl: VIDIOC_ENUM_FMT
                    Index       : 0
                    Type        : Video Capture
                    Pixel Format: 'MJPG' (compressed)
                    Name        : Motion-JPEG
                            Size: Discrete 1920x1080
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.040s (25.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
                           .........
                            Size: Discrete 1280x720
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.020s (50.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
                            ......
                            Size: Discrete 720x576
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.020s (50.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.100s (10.000 fps)



    well, it seems we know by now why this device was ...unexpensive.

    Yes, I have a "90-days open order" and will start to search for
    another, better UVC video capture device.
    The problem is the lack of definitive specifications, compared
    with my proprietary BMD devices.


    it really seems to report only 5-10 fps at fullHD uncompresed,
    anything bigger is mjpeg ...

    Type        : Video Capture
            Pixel Format: 'YUYV'
            Name        : YUYV 4:2:2
                    Size: Discrete 1920x1080
                            Interval: Discrete 0.200s (5.000 fps)

    This can absolutely not be what they promote as:
    "Fluid video recordings without delays or distortions during live
    streaming, thanks to a picture frequency of 60 Hz and 1080p with
    Full HD".


    
https://superuser.com/questions/1449252/ffmpeg-captures-from-uvc-dev-video0-in-any-resolution-except-for-1920x1080

    I also tried that link's suggested syntax

    |ffmpeg -y -t 15 -f video4linux2 -video_size 1920x1080
    -input_format nv12 -timestamps abs -use_libv4l2 1 -i /dev/video0
    out.mov|

    but it didn't work for me, just quitted ffmpeg with

        Unrecognized option 'timestamps'.
        Error splitting the argument list: Option not found

    Looking at ffmpeg man pages at https://manpages.org/ffmpeg/1 there
    also is a similar video4linux2 syntax example

        Grab and record the input of a video4linux2 device, leave the
        frame rate and size as previously set:
        ffmpeg -f video4linux2 -input_format mjpeg -i /dev/video0 out.mpeg

      * video_size
      *     Set the video frame size. The argument must be a string in
        the form WIDTHxHEIGHT or a valid size abbreviation.
      * pixel_format
      *     Select the pixel format (only valid for raw video input).
      * input_format
      *     Set the preferred pixel format (for raw video) or a codec
        name. This option allows one to select the input format, when
        several are available.

    But what should be set as input_format in this case?


YUYV ? (lowercase)

ffmpeg -hide_banner -f video4linux2 -input_format yuyv -i /dev/video0 out.mkv
[video4linux2,v4l2 @ 0x55b25017e0c0] No such input format: yuyv.
/dev/video0: Invalid argument













                    Index       : 1
                    Type        : Video Capture
                    Pixel Format: 'YUYV'
                    Name        : YUYV 4:2:2
                            Size: Discrete 1920x1080
            Interval: Discrete 0.200s (5.000 fps)
                            ......
                            Size: Discrete 1280x720
            Interval: Discrete 0.100s (10.000 fps)
                            .......
                            Size: Discrete 720x576
            Interval: Discrete 0.040s (25.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
            Interval: Discrete 0.200s (5.000 fps)
                            .........

            Encoding:
            --------
            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

            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
            [video4linux2,v4l2 @ 0x559d031190c0] The driver changed
            the time per frame from 1/25 to 1/10

            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
            [video4linux2,v4l2 @ 0x55ce18d060c0] The driver changed
            the time per frame from 1/25 to 1/5

            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
            [video4linux2,v4l2 @ 0x55944900e0c0] The driver changed
            the time per frame from 1/25 to 1/5


            Recorded test video files and probing formats:
            ---------------------------------------------

            du -sh *
            258M    1280x720_ffv1.mkv
            292M    1920x1080_ffv1.mkv
            1,1G    1920x1080_v210.mkv
            61M     720x576_ffv1.mkv
            -----------------------------


            ffprobe -hide_banner 720x576_ffv1.mkv
            Input #0, matroska,webm, from '720x576_ffv1.mkv':
              Metadata:
                ENCODER         : Lavf58.76.100
              Duration: 00:00:09.20, start: 0.000000, bitrate: 55385
            kb/s
              Stream #0:0: Video: ffv1 (FFV1 / 0x31564646),
            yuv422p(tv, progressive), 720x576, 25 fps, 25 tbr, 1k
            tbn, 1k tbc (default)
                Metadata:
                  ENCODER         : Lavc58.134.100 ffv1
                  DURATION        : 00:00:09.200000000
            -----------

            ffprobe -hide_banner 1280x720_ffv1.mkv
            Input #0, matroska,webm, from '1280x720_ffv1.mkv':
              Metadata:
                ENCODER         : Lavf58.76.100
              Duration: 00:00:38.90, start: 0.000000, bitrate: 55512
            kb/s
              Stream #0:0: Video: ffv1 (FFV1 / 0x31564646),
            yuv422p(tv, progressive), 1280x720, 10 fps, 10 tbr, 1k
            tbn, 1k tbc (default)
                Metadata:
                  ENCODER         : Lavc58.134.100 ffv1
                  DURATION        : 00:00:38.900000000
            --------------

            ffprobe -hide_banner 1920x1080_ffv1.mkv
            Input #0, matroska,webm, from '1920x1080_ffv1.mkv':
              Metadata:
                ENCODER         : Lavf58.76.100
              Duration: 00:00:53.40, start: 0.000000, bitrate: 45747
            kb/s
              Stream #0:0: Video: ffv1 (FFV1 / 0x31564646),
            yuv422p(tv, progressive), 1920x1080, 5 fps, 5 tbr, 1k
            tbn, 1k tbc (default)
                Metadata:
                  ENCODER         : Lavc58.134.100 ffv1
                  DURATION        : 00:00:53.400000000
            ----------------

            ffprobe -hide_banner 1920x1080_v210.mkv
            [matroska,webm @ 0x5563ca6d30c0] Stream #0: not enough
            frames to estimate rate; consider increasing probesize
            Input #0, matroska,webm, from '1920x1080_v210.mkv':
              Metadata:
                ENCODER         : Lavf58.76.100
              Duration: 00:00:41.40, start: 0.000000, bitrate:
            221185 kb/s
              Stream #0:0: Video: v210 (v210 / 0x30313276),
            yuv422p10le(tv, progressive), 1920x1080, 5 fps, 1k tbr,
            1k tbn, 1k tbc (default)
                Metadata:
                  ENCODER         : Lavc58.134.100 v210
                  DURATION        : 00:00:41.400000000

            ---------------------------



            2) Scart AV SV to HDMI Converter Switcher S Video
            Composite RCA DVD HD TV adapter (3-4 weeks delivery time
            https://www.ebay.com.au/itm/295472602625

              * The 3-in-1 S-/video/RCA/SCART to HDMI converter is
                a universal converter for analog video input to
                HDMI output.
              * Analog to digital converter (ADC), 10 bits maximum
                1,62 MSPS sampling,



            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!?

            3.1 FFmpeg recipe (PAL)

                ffmpeg -i VIDEO_IN \

                    -c:v ffv1 -level 3 -coder 1 -context 0 -slices
                    24 -slicecrc 1 \
                    -color_primaries bt470bg \
                    -color_trc bt709 \
                    -colorspace bt470bg \
                    -color_range mpeg \
                    -map 0 \
                    -top 1 \
                    -c:a copy \
                    -g 1 -pix_fmt + \
                    VIDEO_OUT.mkv


            3.2 Reference Example
            https://trac.ffmpeg.org/wiki/Encode/FFV1

                Copy audio "as-is" and use FFV1.3 as video codec.

                Parameters are 8 threads, coder=1, context=1,
            GOP-size=1, 24 slices and slice-CRC on:

                ffmpeg -i <input_video>     \
                    -acodec copy          \
                    -vcodec   ffv1 -level 3 \
                    -threads 8             \
                    -coder 1             \
                    -context 1             \
                    -g 1             \
                    -slices 24             \
                    -slicecrc 1             \
                    <output_video>


            3.3 Various Encoding examples for Video capture from
            USB camera /dev/video0:

            ffmpeg -f v4l2 -framerate 25 -video_size 720x576 -i
            /dev/video0 output_data.mkv

            ffmpeg -f v4l2 -framerate 25 -video_size 720x576 -i
            /dev/video0 -codec:v ffv1 -codec:a pcm_s16le \
                -f matroska output_video.mkv

            Check that video is captured properly using ffplay:

            ffmpeg -ar 44100 -thread_queue_size 1024 -f alsa -i
            $AUDIO \
                -r 25 -thread_queue_size 1024 -i $VIDEO \
                -codec copy -f matroska - | ffplay -

            Check the overall flow using ffplay before capturing:

            ffmpeg -ar 44100 -thread_queue_size 1024 -f alsa -i
            $AUDIO \
                -itsoffset -0.5 -r 25 -thread_queue_size 1024 -i
            $VIDEO \
                -filter_complex 'channelmap=FL-0' -filter_complex
            'crop=w=700:h=556:x=8:y=0' \
                -map 1:v  -map 0:a -codec:v ffv1 -codec:a pcm_s16le \
                -f matroska  - | ffplay -



            4, Regarding FFV1 lossless compression in realtime
            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. This according to a 2012/2015 article,
            where I have extracted the results for FFV1 v.3 in the
            tables below:

            
http://www.av-rd.com/knowhow/video/comparison_video_codecs_containers.html#codec_tests
            NOTE: This is a consumer grade, off-the-shelf PC setup.

            Hardware:
            CPU:        Intel(R) QuadCore(TM) i7-2600K CPU @ 3.40GHz
            RAM:        8 GB
            Disk:       Intel SSDSA2CW080G3 (SSD)
            Software:
            Operating System:   GNU/Linux (Xubuntu 12.04.1, 64bit)
            Transcoding tool:   FFmpeg (version git
            N-59183-g3e62654, Dec 17 2013)


            Video source file:  VQEG reference video "football"
            <http://media.xiph.org/video/derf/y4m/football_422_ntsc.y4m>
            (NTSC-SD, 720x486px, 30fps, yuv422p, 8bpc)
            Codec       Encoding        Decoding        Filesize        % of 
uncompressed
            Implementation      Details
            FFV1
            
<http://www.av-rd.com/knowhow/video/comparison_video_codecs_containers.html#codec_ffv1>
            (version 3)         216 fps         277 fps         111 MiB         
46.1%
            libavcodec (FFmpeg)
            <http://en.wikipedia.org/wiki/Libavcodec>     log
            
<http://www.av-rd.com/knowhow/video/test_results/football-720x486i30/ffv1.3-libavcodec_ffmpeg_avi.log>,
            framemd5
            
<http://www.av-rd.com/knowhow/video/test_results/football-720x486i30/ffv1.3-libavcodec_ffmpeg_avi.framemd5>




            Video source file:  SVT reference video "park joy"
            <http://media.xiph.org/video/derf/y4m/park_joy_1080p50.y4m>
            (full-HD/1080p, 1920x1080px, 50fps, yuv420p, 8bpc)
            Codec       Encoding        Decoding        Filesize        % of 
uncompressed
            Implementation      Details
            FFV1
            
<http://www.av-rd.com/knowhow/video/comparison_video_codecs_containers.html#codec_ffv1>
            (version 3)         31 fps  63 fps  879 MiB         57.2%   
libavcodec
            (FFmpeg) <http://en.wikipedia.org/wiki/Libavcodec>    log
            
<http://www.av-rd.com/knowhow/video/test_results/park_joy-1920x1080p50/ffv1.3-libavcodec_ffmpeg_avi.log>,
            framemd5
            
<http://www.av-rd.com/knowhow/video/test_results/park_joy-1920x1080p50/ffv1.3-libavcodec_ffmpeg_avi.framemd5>





            PAL-SD 720x576 stored as YUV422, 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.

            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?


            5. Related 2021-[Cin] threads as background references

            [Cin] hdmi capture card (with v4l2)
            
https://www.mail-archive.com/[email protected]/msg02865.html

            [Cin] offtopic: Digitize and record Video with A/D USB
            adapters
            
https://www.mail-archive.com/[email protected]/msg03269.html

            [Cin] offtopic: HDMI capture
            
https://www.mail-archive.com/[email protected]/msg02084.html

            [Cin] Is SD and HD 422 Video Capture obtainable with
            V4L(2)?
            
https://www.mail-archive.com/[email protected]/msg03719.html

            [Cin] Uncompressed video to lossless compression FFV1/MKV
            
https://www.mail-archive.com/[email protected]/msg03791.html

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