Blackmagic Intensity pro with ffmpeg for VHS

[prodarek]

Hello
I recently bought the title card for little money, I work on Linux, I use Panasonic HS960 + Pioneer dvr 560. Everything works fine. Most of the time I tested the component connection but I also have the option to check s-video with ffmpeg software. Does anyone use a similar devices and have any advice or tips?

Greetings

[prodarek]

I'm currently using the following code to capture via s-video from pioneer recorder:

ffmpeg \
-cpucount 16 \
-hide_banner \
-err_detect +crccheck+bitstream+buffer+compliant+aggressive \
-format_code pal -f decklink -i 'Intensity Pro' \
-aspect 4:3 \
-vcodec ffv1 -level 3 -threads 16 -coder 1 -context 1 -g 1 -slices 30 -slicecrc 1 \
-pix_fmt yuv420p \
-colorspace bt470bg \
-color_primaries bt470bg \
-acodec pcm_s16le \
-vf "crop=in_w-2*8" \
test_capture-$(date +%F-%I-%M-%N).mkv

[decklink @ 0x563f2af1da00] Found Decklink mode 720 x 576 with rate 25.00(i)
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, decklink, from 'Intensity Pro':
  Duration: N/A, start: 0.000000, bitrate: 167424 kb/s
  Stream #0:0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
  Stream #0:1: Video: rawvideo (UYVY / 0x59565955), uyvy422(top first), 720x576, 165888 kb/s, 25 fps, 25 tbr, 1000k tbn
Stream mapping:
  Stream #0:1 -> #0:0 (rawvideo (native) -> ffv1 (native))
  Stream #0:0 -> #0:1 (pcm_s16le (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, matroska, to 'test_capture-2023-10-29-02-07-413691944.mkv':
  Metadata:
    encoder         : Lavf60.3.100
  Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), yuv420p(tv, bt470bg/bt470bg/unknown, top coded first (swapped)), 704x576 [SAR 12:11 DAR 4:3], q=2-31, 200 kb/s, 25 fps, 1k tbn
    Metadata:
      encoder         : Lavc60.3.100 ffv1
  Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s16, 1536 kb/s
    Metadata:
      encoder         : Lavc60.3.100 pcm_s16le
frame=  330 fps= 25 q=-0.0 size=   76544kB time=00:00:13.20 bitrate=47503.7kbits/s speed=1.02x    

[q] command received. Exiting.

Video
ID                                       : 1
Format                                   : FFV1
Format version                           : Version 3.4
Format settings, GOP                     : N=1
Codec ID                                 : V_MS/VFW/FOURCC / FFV1
Duration                                 : 13 s 680 ms
Bit rate mode                            : Variable
Bit rate                                 : 45.3 Mb/s
Width                                    : 704 pixels
Height                                   : 576 pixels
Display aspect ratio                     : 4:3
Frame rate mode                          : Constant
Frame rate                               : 25.000 FPS
Standard                                 : PAL
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Interlaced
Scan type, store method                  : Interleaved fields
Scan order                               : Top Field First
Compression mode                         : Lossless
Bits/(Pixel*Frame)                       : 4.471
Stream size                              : 73.9 MiB (95%)
Writing library                          : Lavc60.3.100 ffv1
Default                                  : No
Forced                                   : No
Color range                              : Limited
Color primaries                          : BT.601 PAL
Matrix coefficients                      : BT.470 System B/G
coder_type                               : Range Coder
MaxSlicesCount                           : 30
ErrorDetectionType                       : Per slice

I have two question should I use"
-pix_fmt yuv420p
-vf "crop=in_w-2*8"
The last it is to crop size to 704.

Thank you for your advice.