В сообщении от Monday 27 April 2020 16:25:36 - - написал(а): > Hello,
> > I would like to use an old webcam for webrtc with firefox. My Firefox > (86.6.0esr, latest on CentOS 7) aborts before playing the webcam. As far as I > know, firefox uses ffmpeg for video playback. So I kindly ask this mailing > list for some advice. > > I can play the webcam (TerraCAM USB Pro) with "vlc v4l2:///dev/video0", but > > "ffmpeg -f v4l2 -i /dev/video0" throws : > ... > > [video4linux2,v4l2 @ 0xcb3a500] Cannot find a proper format for codec 'none' > (id 0), pixel format 'none' (id -1) > Assertion *codec_id != AV_CODEC_ID_NONE failed at src/libavdevice/v4l2.c:815 > > "v4l2-ctl --list-formats-ext" shows Omnivision chipset OV518 with special > compression format : > > ioctl: VIDIOC_ENUM_FMT > Index : 0 > Type : Video Capture > Pixel Format: 'O518' (compressed) > Name : GSPCA OV518 > Size: Discrete 320x240 > Size: Discrete 640x480 > > > "ffmpeg -f -v4l2 -list_formats all -i /dev/video0" shows, that this format > is not supported : > > > > ffmpeg version 4.2.2-static https://johnvansickle.com/ffmpeg/ Copyright (c) > 2000-2019 the FFmpeg developers > built with gcc 8 (Debian 8.3.0-6) > configuration: --enable-gpl --enable-version3 --enable-static --disable-debug > --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc > --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp > --enable-libgme --enable-gray --enable-libfribidi --enable-libass > --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb > --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband > --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libvorbis > --enable-libopus --enable-libtheora --enable-libvidstab > --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 > --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg > 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 > libswscale 5. 5.100 / 5. 5.100 > libswresample 3. 5.100 / 3. 5.100 > libpostproc 55. 5.100 / 55. 5.100 > [video4linux2,v4l2 @ 0xc482600] Compressed: Unsupported : GSPCA OV518 : > 320x240 640x480 > /dev/video0: Immediate exit requested > > > As you see, I am using latest ffmpeg static build. I also tried an own > build, but so far without success. > > > > So, how can I get this webcam running (hopefully for firefox, too)? may be try to LD_PRELOAD v4l2 library, like desribed here? https://wiki.archlinux.org/index.php/Webcam_setup If the application has V4L2 support but no pixelformat support then use the following command: LD_PRELOAD=/usr/lib/libv4l/v4l2convert.so application > _______________________________________________ Libav-user mailing list Libav-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/libav-user To unsubscribe, visit link above, or email libav-user-requ...@ffmpeg.org with subject "unsubscribe".
