How to properly configure video resolution / format
Closed this issue · 4 comments
I'm trying to use an akvcam device as a tool to stream over e.g. Google Meet by composing my scene with OBS. While I'm able to actually stream some video through the virtual camera, the output looks weird with the scene being replicated multiple times and in grayscale.
Here's what I mean:
I guess something is off either in my akvcam configuration, in my OBS recording configuration, in my ffmpeg command or in any valid permutation of the interactions between the three tools :-)
Thing is, I have no clue what might be the source of the issue.
Here's my akvcam configuration file:
[Cameras]
cameras/size = 2
cameras/1/type = output
cameras/1/mode = mmap, userptr, rw
cameras/1/description = Virtual Camera (output device)
cameras/1/formats = 2
cameras/2/type = capture
cameras/2/mode = mmap, rw
cameras/2/description = Virtual Camera
cameras/2/formats = 1, 2
[Formats]
formats/size = 2
# -> into akvcam
formats/1/format = YUY2
formats/1/width = 3840
formats/1/height = 2160
formats/1/fps = 30/1
# <- out of akvcam
formats/2/format = RGB24
formats/2/width = 3840
formats/2/height = 2160
formats/2/fps = 20/1, 15/2
[Connections]
connections/size = 1
connections/1/connection = 1:2As well as my OBS recording configuration:
And the ffmpeg command that I use to connect OBS to akvcam:
ffmpeg -i udp://localhost:12345 -f v4l2 -s 3840x2160 /dev/video4
When you run ffmpeg it shows the streaming information like the codecs and pixel formats used, can you give me that information?
sure, here's the full output from ffmpeg:
$ ffmpeg -i udp://localhost:12345 -f v4l2 -s 3840x2160 /dev/video4
ffmpeg version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
libavutil 55. 78.100 / 55. 78.100
libavcodec 57.107.100 / 57.107.100
libavformat 57. 83.100 / 57. 83.100
libavdevice 57. 10.100 / 57. 10.100
libavfilter 6.107.100 / 6.107.100
libavresample 3. 7. 0 / 3. 7. 0
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100
Input #0, mpegts, from 'udp://localhost:12345':
Duration: N/A, start: 0.000000, bitrate: N/A
Program 1
Metadata:
service_name : Service01
service_provider: FFmpeg
Stream #0:0[0x100]: Video: mpeg4 (Simple Profile) ([16][0][0][0] / 0x0010), yuv420p, 3840x2160 [SAR 1:1 DAR 16:9], 30 fps, 30 tbr, 90k tbn, 30 tbc
Stream #0:1[0x101]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, 110 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (mpeg4 (native) -> rawvideo (native))
Press [q] to stop, [?] for help
Output #0, v4l2, to '/dev/video4':
Metadata:
encoder : Lavf57.83.100
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 3840x2160 [SAR 1:1 DAR 16:9], q=2-31, 2985984 kb/s, 30 fps, 30 tbn, 30 tbc
Metadata:
encoder : Lavc57.107.100 rawvideo
You must set -pix_fmt rgb24, check the wiki.
Alright, thanks a lot!