[linux-uvc-devel] Welch Allyn Digital Otoscope playback not working

[Fabian S. <f.s...@ne...>]

Hi

Our Welch Allyn Digital Otoscope gets recognized by the uvc driver but 
playback on device /dev/video0 or /dev/video1 fails

ffplay /dev/video0
ffplay version 4.2.4-1ubuntu0.1 Copyright (c) 2003-2020 the FFmpeg 
developers
   built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
   configuration: --prefix=/usr --extra-version=1ubuntu0.1 
--toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu 
--incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl 
--disable-stripping --enable-avresample --disable-filter=resample 
--enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom 
--enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca 
--enable-libcdio --enable-libcodec2 --enable-libflite 
--enable-libfontconfig --enable-libfreetype --enable-libfribidi 
--enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame 
--enable-libmysofa --enable-libopenjpeg --enable-libopenmpt 
--enable-libopus --enable-libpulse --enable-librsvg 
--enable-librubberband --enable-libshine --enable-libsnappy 
--enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora 
--enable-libtwolame --enable-libvidstab --enable-libvorbis 
--enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 
--enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi 
--enable-lv2 --enable-omx --enable-openal --enable-opencl 
--enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm 
--enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r 
--enable-libx264 --enable-shared
   libavutil      56. 31.100 / 56. 31.100
   libavcodec     58. 54.100 / 58. 54.100
   libavformat    58. 29.100 / 58. 29.100
   libavdevice    58.  8.100 / 58.  8.100
   libavfilter     7. 57.100 /  7. 57.100
   libavresample   4.  0.  0 /  4.  0.  0
   libswscale      5.  5.100 /  5.  5.100
   libswresample   3.  5.100 /  3.  5.100
   libpostproc    55.  5.100 / 55.  5.100
[video4linux2,v4l2 @ 0x7f880c000bc0] ioctl(VIDIOC_STREAMON): 
Input/output error
/dev/video0: Input/output error

Do I need to configure any quirks to get it working ?

Fabian