Update FFmpeg hardware detection for macOS

[skrashevich]

updates the video toolbox probe commands in hardware_darwin.go to utilize SVGA resolution, because of QVGA isn'r supported by videotoolbox h264 encoder on macOS systems and always fails. The changes affect both the H264 and H265 codec probe commands.

[AlexxIT]

They not fail on mine M1. On what systems they failing?

[skrashevich]

MacBook Pro custom config:
2,8 GHz 4‑core Intel Core i7
Radeon Pro 555 2 ГБ
Intel HD Graphics 630 1536 МБ
16 ГБ 2133 MHz LPDDR3
macOS 13.3 (22E252)

svk@MacBook-Pro-Sergei ~ % ffmpeg -hide_banner -f lavfi -i testsrc2 -t 1 -c h264_videotoolbox -f null -
Input #0, lavfi, from 'testsrc2':
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (h264_videotoolbox))
Press [q] to stop, [?] for help
[h264_videotoolbox @ 0x7f9572706840] Error: cannot create compression session: -12903
[h264_videotoolbox @ 0x7f9572706840] Try -allow_sw 1. The hardware encoder may be busy, or not supported.
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!
svk@MacBook-Pro-Sergei ~ % ffmpeg -hide_banner -f lavfi -i testsrc2 -t 1 -c hevc_videotoolbox -f null -
Input #0, lavfi, from 'testsrc2':
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> hevc (hevc_videotoolbox))
Press [q] to stop, [?] for help
Output #0, null, to 'pipe:':
  Metadata:
    encoder         : Lavf59.27.100
  Stream #0:0: Video: hevc, yuv420p(progressive), 320x240 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 25 fps, 25 tbn
    Metadata:
      encoder         : Lavc59.37.100 hevc_videotoolbox
[hevc_videotoolbox @ 0x7ff526007b00] Color range not set for yuv420p. Using MPEG range.
frame=   25 fps=0.0 q=-0.0 Lsize=N/A time=00:00:01.00 bitrate=N/A speed=2.26x    
video:43kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

[AlexxIT]

Thanks!

[AlexxIT]

https://github.com/AlexxIT/go2rtc/releases/tag/v1.6.0