[Cin] Analog S-Video or HDV capture via HDMI-USB to FFV1.mkv in realtime
Terje J. Hanssen
terjejhanssen at gmail.com
Wed Feb 8 15:16:21 CET 2023
Den 08.02.2023 14:21, skrev Andrew Randrianasulu:
>
>
> ср, 8 февр. 2023 г., 14:47 Terje J. Hanssen <terjejhanssen at gmail.com>:
>
>
>
> Den 08.02.2023 02:38, skrev Andrew Randrianasulu:
>>
>>
>> ср, 8 февр. 2023 г., 04:08 Terje J. Hanssen
>> <terjejhanssen at gmail.com>:
>>
>>
>>
>> Den 08.02.2023 00:52, skrev Andrew Randrianasulu:
>>>
>>>
>>> ср, 8 февр. 2023 г., 01:35 Terje J. Hanssen via Cin
>>> <cin at lists.cinelerra-gg.org>:
>>>
>>>
>>>
>>> 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/cin@lists.cinelerra-gg.org/msg02865.html
>>>>
>>>> [Cin] offtopic: Digitize and record Video with A/D USB
>>>> adapters
>>>> https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg03269.html
>>>>
>>>> [Cin] offtopic: HDMI capture
>>>> https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg02084.html
>>>>
>>>> [Cin] Is SD and HD 422 Video Capture obtainable with
>>>> V4L(2)?
>>>> https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg03719.html
>>>>
>>>> [Cin] Uncompressed video to lossless compression FFV1/MKV
>>>> https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg03791.html
>>>
>>> --
>>> Cin mailing list
>>> Cin at lists.cinelerra-gg.org
>>> https://lists.cinelerra-gg.org/mailman/listinfo/cin
>>>
>>
>
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