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• Stuck in deadend while compiling ffmpeg with nvidia CUDA support on Ubuntu 18.04 and GeForce GT 730

  24 février 2019, par Marko

  I want to compile ffmpeg with CUDA support, on Ubuntu 18.04, and my graphics card is GeForce GT 730 (so far I have not CUDA programming experience).
  Here nvidia claims that it has at least some transcoding support.

  I have cloned https://git.ffmpeg.org/ffmpeg.git and as I understand I also need to build and install nv-codec-headers.

  But there in the README, they say that minimum driver version for Linux is 418.30 or newer. So I went to nvidia site to download driver and after selecting my card I got this download link. So the driver version is high enough it seems. But when I try to install it I get message that this device will be ignored by that driver and that it is supported by legacy driver 390.xx (which is version I can install with apt).
  Is something wrong with nVidia, why are they offering me driver that is cannot be used for this device ?

  I’ve installed 390.xx driver using ubuntu-drivers autoinstall and built ffmpeg, but when I try to run it I get this error : Cannot load cuvidGetDecodeStatus [h264_cuvid @ 0x562a86dbc680] Failed loading nvcuvid.

  I suppose it is because of driver ?

  So, what can I do to unstuck myself ?

• Writing MJPEG to loopback device with FFMPEG fails on Ubuntu 20.04. Works on Rasperry Pi

  22 avril 2022, par Yllier123

  I have a script that writes MJPEG from an HDMI video capture card (/dev/video0) to a v4l2loopback device (/dev/video5). I compiled the v4l2loopback module from source. This script works fine on Raspberry Pi but fails on Ubuntu with this error :
V4L2 output device supports only a single raw video stream. Is there a way around this or am I forced to transcode the HDMI capture output to rawvideo ? I would prefer to get this working on Ubuntu in the same way it is working on Raspberry Pi.

  


  Here is the FFMPEG command :

  


  ffmpeg -input_format mjpeg -framerate 30 -s 1280x720 -i /dev/video0 -vcodec copy -f v4l2 /dev/video5

  


  Full output of command :

  


  Input #0, video4linux2,v4l2, from '/dev/video0':
Duration: N/A, start: 9137.845580, bitrate: N/A
Stream #0:0: Video: mjpeg (Baseline), yuvj422p(pc, bt470bg/unknown/unknown), 1280x720, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
[video4linux2,v4l2 @ 0x55eb0d461b40] V4L2 output device supports only a single raw video stream
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Stream mapping:
  Stream #0:0 -> #0:0 (copy)


  


• Issue with ffmpeg ubuntu

  12 octobre 2017, par Rahul Agnihotri

  I am getting below given error while trying to use ffmpeg :

  video:45kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : unknown

  The command i am executing is as follows :
  sudo ffmpeg -i /home/agnihotri/Downloads/1.mp4 -vf fps=1/600 /home/agnihotri/positive/img%03d.jpg

  My objective to extract or save a image every 10 seconds...however it only works for initial 30 seconds and then gives the error or issue.

  Thanks in advance.

  Rahul Agnihotri