ffmpeg x11grab capture on Xubuntu Linux fails

[CursedLemon]

Hey guys, so I'm trying to do some screen recording on Xubuntu Linux 20.04 using a new laptop I bought. I'm trying to set this up as simple as possible, which in my case is setting the following command up as a simple alias:

ffmpeg -video_size 1920x1080 -framerate 24 -f x11grab -c:v h264_nvenc -qp 0 ~/Desktop/video.mp4

However, I get the following message in response:

[NULL @ 0x5601c0bee900] Requested output format 'x11grab' is not a suitable output format

Is there a different window manager I should be specifying on XFCE? If I type the following command:

ffmpeg -formats

x11grab is listed as a decoder, so it's definitely present. Using that "-f x11grab" argument is what the ffmpeg documentation says to do. Anyone got any bright ideas?

[jk50]

Your missing an input parameter. FFmpeg needs the display number of the screen you want to capture.This should work.

ffmpeg -video_size 1920x1080 -framerate 24 -f x11grab -i :0.0 -c:v h264_nvenc -qp 0 ~/Desktop/video.mp4

http://https://ffmpeg.org/ffmpeg-devices.html#x11grab

[CursedLemon]

Your missing an input parameter. FFmpeg needs the display number of the screen you want to capture.This should work.

ffmpeg -video_size 1920x1080 -framerate 24 -f x11grab -i :0.0 -c:v h264_nvenc -qp 0 ~/Desktop/video.mp4

http://https://ffmpeg.org/ffmpeg-devices.html#x11grab

Nah I tried that, still get the same error.

[october262]

Your missing an input parameter. FFmpeg needs the display number of the screen you want to capture.This should work.

ffmpeg -video_size 1920x1080 -framerate 24 -f x11grab -i :0.0 -c:v h264_nvenc -qp 0 ~/Desktop/video.mp4

http://https://ffmpeg.org/ffmpeg-devices.html#x11grab

Nah I tried that, still get the same error.

try ffmpeg -f x11grab -r 30 -i :0.0+x,y -f flv rtmp://url?
- https://superuser.com/questions/709866/ffmpeg-x11grab-a-single-window

[CursedLemon]

Your missing an input parameter. FFmpeg needs the display number of the screen you want to capture.This should work.

ffmpeg -video_size 1920x1080 -framerate 24 -f x11grab -i :0.0 -c:v h264_nvenc -qp 0 ~/Desktop/video.mp4

http://https://ffmpeg.org/ffmpeg-devices.html#x11grab

Nah I tried that, still get the same error.

try ffmpeg -f x11grab -r 30 -i :0.0+x,y -f flv rtmp://url?
- https://superuser.com/questions/709866/ffmpeg-x11grab-a-single-window

Still doesn't get past the x11grab part, also there's two uses of "-f" there?

[october262]

Your missing an input parameter. FFmpeg needs the display number of the screen you want to capture.This should work.

ffmpeg -video_size 1920x1080 -framerate 24 -f x11grab -i :0.0 -c:v h264_nvenc -qp 0 ~/Desktop/video.mp4

http://https://ffmpeg.org/ffmpeg-devices.html#x11grab

Nah I tried that, still get the same error.

try ffmpeg -f x11grab -r 30 -i :0.0+x,y -f flv rtmp://url?
- https://superuser.com/questions/709866/ffmpeg-x11grab-a-single-window

Still doesn't get past the x11grab part, also there's two uses of "-f" there?

have you tried these ?? - https://trac.ffmpeg.org/wiki/Capture/Desktop

[CursedLemon]

Your missing an input parameter. FFmpeg needs the display number of the screen you want to capture.This should work.

ffmpeg -video_size 1920x1080 -framerate 24 -f x11grab -i :0.0 -c:v h264_nvenc -qp 0 ~/Desktop/video.mp4

http://https://ffmpeg.org/ffmpeg-devices.html#x11grab

Nah I tried that, still get the same error.

try ffmpeg -f x11grab -r 30 -i :0.0+x,y -f flv rtmp://url?
- https://superuser.com/questions/709866/ffmpeg-x11grab-a-single-window

Still doesn't get past the x11grab part, also there's two uses of "-f" there?

have you tried these ?? - https://trac.ffmpeg.org/wiki/Capture/Desktop

That's where I got my syntax from, it doesn't seem like there's any other mechanism for capturing your screen on Linux other than x11grab.

[october262]

Your missing an input parameter. FFmpeg needs the display number of the screen you want to capture.This should work.

ffmpeg -video_size 1920x1080 -framerate 24 -f x11grab -i :0.0 -c:v h264_nvenc -qp 0 ~/Desktop/video.mp4

http://https://ffmpeg.org/ffmpeg-devices.html#x11grab

Nah I tried that, still get the same error.

try ffmpeg -f x11grab -r 30 -i :0.0+x,y -f flv rtmp://url?
- https://superuser.com/questions/709866/ffmpeg-x11grab-a-single-window

Still doesn't get past the x11grab part, also there's two uses of "-f" there?

have you tried these ?? - https://trac.ffmpeg.org/wiki/Capture/Desktop

That's where I got my syntax from, it doesn't seem like there's any other mechanism for capturing your screen on Linux other than x11grab.

for this error - [NULL @ 0x5601c0bee900] Requested output format 'x11grab' is not a suitable output format
in your first post, try this fix - https://rubenerd.com/recording-screens-with-ffmpeg/

[CursedLemon]

Heeey I've actually made "progress", so this is the current command I'm running:

ffmpeg -framerate 24 -f x11grab -i :0.0 -c:v h264_nvenc -qp 20 ~/Desktop/video.mp4

But now I'm getting this message: "Cannot load libcuda.so.1, Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bite_rate, rate, width or height"

I don't see any bad parameters, does anyone else? Or is my syntax wrong yet again?

[october262]

Heeey I've actually made "progress", so this is the current command I'm running:

ffmpeg -framerate 24 -f x11grab -i :0.0 -c:v h264_nvenc -qp 20 ~/Desktop/video.mp4

But now I'm getting this message: "Cannot load libcuda.so.1, Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bite_rate, rate, width or height"

I don't see any bad parameters, does anyone else? Or is my syntax wrong yet again?

for this - Cannot load libcuda.so.1, Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bite_rate, rate, width or height
see here - https://stackoverflow.com/questions/13877031/error-while-opening-encoder-for-output-st...ect-parameters

[CursedLemon]

I'm not trying to record audio at the moment and there's no audio stream present anyway, so that doesn't have an effect. Here's the full output:

master@lemonNITRO:~ $ ffmpeg -video_size 1920x1080 -framerate 24 -f x11grab -i :0.0 -acodec copy -c:v h264_nvenc -qp 20 ~/Desktop/recording.mp4
ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 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
[x11grab @ 0x55f63c141840] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #0, x11grab, from ':0.0':
  Duration: N/A, start: 1642797024.636254, bitrate: N/A
    Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1920x1080, 24 fps, 1000k tbr, 1000k tbn, 1000k tbc
File '/home/master/Desktop/recording.mp4' already exists. Overwrite ? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (h264_nvenc))
Press [q] to stop, [?] for help
[h264_nvenc @ 0x55f63c14fc40] Cannot load libcuda.so.1
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!

Kind of wondering what those tbr/tbc/tbn outputs are about.

EDIT: Also, bgr0 pixel format?

[CursedLemon]

Just tested recording with:

ffmpeg -video_size 1920x1080 -framerate 24 -f x11grab -i :0.0 -c:v libx264 -crf 20 ~/Desktop/recording.mp4

It worked great, great quality and tiny file size. So the problem seems to be with initializing h264_nvenc. I'm running the mobile version of RTX3050, does that not have NVENC support?

EDIT: IT DOESN'T