Re: Logitech HD Pro Webcam C920 USB webcam resolution

[Ramiro Aceves <ea1abz%gmail.com@localhost>]

Hello,

Have tried a bit with mplayer, all commands using VNC session to the 
raspberrypi4:

netbsd-raspa4$ mplayer tv:// -tv 
driver=v4l2:device=/dev/video0:width=352:height=288

works fine. I can watch the webcam stream.

netbsd-raspa4$ mplayer tv:// -tv 
driver=v4l2:device=/dev/video0:width=640:height=480

works fine. Bigger window, better resolution.

netbsd-raspa4$ mplayer tv:// -tv 
driver=v4l2:device=/dev/video0:width=800:height=600

The video window is bigger appears to have a better resolution, but it's 
completely like a puzzle.

full command output:

netbsd-raspa4$ mplayer tv:// -tv 
driver=v4l2:device=/dev/video0:width=800:height=600
MPlayer 1.5-10.5.0 (C) 2000-2022 MPlayer Team
226 audio & 469 video codecs

Playing tv://.
TV file format detected.
Selected driver: v4l2
 name: Video 4 Linux 2 input
 author: Martin Olschewski <olschewski%zpr.uni-koeln.de@localhost>
 comment: first try, more to come ;-)
Selected device: vendor 046d (0x046d) HD Pro Web
 Capabilities:  video capture  read/write  streaming
 supported norms: 0 = webcam;
 inputs: 0 = Camera;
 Current input: 0
 Current format: YUYV
v4l2: ioctl set format failed: Invalid argument
v4l2: ioctl set format failed: Invalid argument
v4l2: ioctl set format failed: Invalid argument
tv.c: norm_from_string(pal): Bogus norm parameter, setting default.
Selected input hasn't got a tuner!
v4l2: ioctl set mute failed: Invalid argument
v4l2: ioctl query control failed: Invalid argument
v4l2: ioctl query control failed: Invalid argument
v4l2: ioctl query control failed: Invalid argument
v4l2: ioctl query control failed: Invalid argument
Xlib:  extension "XFree86-VidModeExtension" missing on display ":1.0".
[VO_XV] It seems there is no Xvideo support for your video card available.
[VO_XV] Run 'xvinfo' to verify its Xv support and read
[VO_XV] DOCS/HTML/en/video.html#xv!
[VO_XV] See 'mplayer -vo help' for other (non-xv) video out drivers.
[VO_XV] Try -vo x11.
[gl] no GLX support present
==========================================================================
Opening video decoder: [raw] RAW Uncompressed Video
Could not find matching colorspace - retrying with -vf scale...
Opening video filter: [scale]
Movie-Aspect is undefined - no prescaling applied.
[swscaler @ 0xfca527aa13c0] bicubic scaler, from yuyv422 to bgra using C
VO: [x11] 800x600 => 800x600 BGRA
Selected video codec: [rawyuy2] vfm: raw (RAW YUY2)
==========================================================================
Audio: no sound
Starting playback...
V:   0.0 116/116 ??% ??% ??,?% 0 0
v4l2: ioctl set mute failed: Invalid argument
v4l2: 119 frames successfully processed, 60 frames dropped.

Exiting... (Quit)
netbsd-raspa4$ mplayer tv:// -tv 
driver=v4l2:device=/dev/video0:width=800:height=600




netbsd-raspa4$ mplayer tv:// -tv 
driver=v4l2:device=/dev/video0:width=1280:height=720
netbsd-r

Bigger picture, seems to be with more resolution but screen is puzzleded 
with 8 horizontal bands

netbsd-raspa4$ mplayer tv:// -tv 
driver=v4l2:device=/dev/video0:width=1280:height=720
netbsd-r

Same but with a more puzzleded window.

Regards.