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Thread: Simple guide to grab desktop with FFMPEG

  1. #11
    Join Date
    Apr 2010
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    Croatia, Zagreb
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    19
    Distro
    Ubuntu 9.10 Karmic Koala

    Re: VERY simple guide to grab desktop with FFMPEG

    Thanks for opening a topic like this!

    It's just what I need. To bad it doesn't work for me.
    I start the script and it crashes (I think it's the pulse part because I have a identical script that works but the only difference is that instead of pulse it's hw:0,0).

    I would like to have a working script that records the desktop, microphone and desktop sounds at the same time.

    Can someone help?

  2. #12
    Join Date
    Jun 2012
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    212

    Re: VERY simple guide to grab desktop with FFMPEG

    Is it possible to record desktop, mic, desktop sound and webcam?

    EDIT: and how do I know ffmpeg is recording and how to make it record?
    Last edited by Sarys; August 5th, 2012 at 10:04 AM.

  3. #13
    Join Date
    Dec 2012
    Beans
    2

    Re: VERY simple guide to grab desktop with FFMPEG

    Hi! Can I stream my desktop live via udp in ffmpeg? Any help would be greatly apeciated!

  4. #14
    Join Date
    Sep 2006
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    3,470

    Re: VERY simple guide to grab desktop with FFMPEG

    A good start might be:
    Code:
    ffmpeg -framerate ntsc -video_size 640x480 -f x11grab -i :0.0 -vcodec libx264 -crf 26 -preset fast -f mpegts udp://<hostname>:<port>

  5. #15
    Join Date
    Oct 2013
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    3

    Re: VERY simple guide to grab desktop with FFMPEG

    I'm running into a problem where I can't capture more than 2048 pixels of my screen. My screen width is 2560x1600. Is there any way to downscale the resolution before I record/stream it live?

    For option "-s 2560x1600', I get the error "swScaler: Compile time max width is 2048 change VOF/VOFW and recompile".

  6. #16
    Join Date
    Sep 2006
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    3,470

    Re: VERY simple guide to grab desktop with FFMPEG

    Please include your ffmpeg command and the complete console output.

  7. #17
    Join Date
    Oct 2013
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    3

    Re: VERY simple guide to grab desktop with FFMPEG

    ffmpeg -f x11grab -s woxga -r 20 -i :0.0 -f mpegts udp://192.168.4.111:1234


    FFmpeg version SVN-r15261, Copyright (c) 2000-2008 Fabrice Bellard, et al.
    configuration: --prefix=/usr --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --extra-cflags=-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -D_ISOC99_SOURCE -D_POSIX_C_SOURCE=200112 -fasm -std=c99 -fno-math-errno --enable-libdc1394 --enable-libfaac --enable-libfaad --enable-libgsm --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avfilter-lavf --enable-postproc --enable-swscale --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-optimizations --disable-stripping
    libavutil 49.10. 0 / 49.10. 0
    libavcodec 51.71. 0 / 51.71. 0
    libavformat 52.22. 1 / 52.22. 1
    libavdevice 52. 1. 0 / 52. 1. 0
    libavfilter 0. 1. 0 / 0. 1. 0
    libswscale 0. 6. 1 / 0. 6. 1
    libpostproc 51. 2. 0 / 51. 2. 0
    built on Feb 4 2009 19:41:05, gcc: 4.1.2 20071124 (Red Hat 4.1.2-42)
    [x11grab @ 0x191521b0]device: :0.0 -> display: :0.0 x: 0 y: 0 width: 2560 height: 1600
    [x11grab @ 0x191521b0]shared memory extension found
    Input #0, x11grab, from ':0.0':
    Duration: N/A, start: 1380813980.541533, bitrate: -2147483 kb/s
    Stream #0.0: Video: rawvideo, rgb32, 2560x1600, -2147483 kb/s, 20.00 tb(r)
    swScaler: Compile time max width is 2048 change VOF/VOFW and recompile
    Cannot get resampling context


    When I change the resolution, (example 1280x800 half of screen), I only get the upper right quadrant. I just want to know how I can resample the whole screen to a lower resolution.
    Last edited by Jay_Kemper; October 3rd, 2013 at 04:32 PM.

  8. #18
    Join Date
    Sep 2006
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    3,470

    Re: VERY simple guide to grab desktop with FFMPEG

    Quote Originally Posted by Jay_Kemper View Post
    Code:
    FFmpeg version SVN-r15261, Copyright (c) 2000-2008 Fabrice Bellard, et al.
    Wow, this is absolutely ancient. Where did you find this? What is your distro?

    There have been at least 41582 updates to ffmpeg since your graybeard version. Not to be blunt, but you're wasting your time (and mine) using this.

    Please use the code tag.

  9. #19
    Join Date
    Oct 2013
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    3

    Re: VERY simple guide to grab desktop with FFMPEG

    Turns out that the source code needs to be downloaded and built. The version available from their git repo seems to handle higher resolutions. In their compilation instructions, they do miss some required package that need to be installed.

    From the original ffmpeg installed from the distribution repo

    $ ffmpeg

    FFmpeg version 0.6.5, Copyright (c) 2000-2010 the FFmpeg developers
    built on Jan 29 2012 23:55:02 with gcc 4.1.2 20080704 (Red Hat 4.1.2-51)
    configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --incdir=/usr/include --disable-avisynth --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --enable-avfilter --enable-avfilter-lavf --enable-libdirac --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-gpl --enable-nonfree --enable-postproc --enable-pthreads --enable-shared --enable-swscale --enable-vdpau --enable-version3 --enable-x11grab
    libavutil 50.15. 1 / 50.15. 1
    libavcodec 52.72. 2 / 52.72. 2
    libavformat 52.64. 2 / 52.64. 2
    libavdevice 52. 2. 0 / 52. 2. 0
    libavfilter 1.19. 0 / 1.19. 0
    libswscale 0.11. 0 / 0.11. 0
    libpostproc 51. 2. 0 / 51. 2. 0
    Hyper fast Audio and Video encoder
    usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

    Use -h to get full help or, even better, run 'man ffmpeg'

    $ git clone git://source.ffmpeg.org/ffmpeg.git ffmpeg

    $ yum remove ffmpeg

    $ cd ffmpeg

    $ ./configure --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --incdir=/usr/include --disable-avisynth --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --enable-avfilter --enable-avfilter-lavf --enable-libdirac --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-gpl --enable-nonfree --enable-postproc --enable-pthreads --enable-shared --enable-swscale --enable-vdpau --enable-version3 --enable-x11grab


    It may say that some options aren't valid, just delete them and try again. You might also get

    Xext not found

    Open up your package manager and search for xext and install the dev packages. Same for Xfiles.

    $ make

    ....


    $ make install

    $ ffmpeg -f x11grab -s 2560x1600 -r 20 -i :0.0 -s 1280x800 -f mpegts udp://192.168.0.1:1234

  10. #20
    Join Date
    Jul 2012
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    315
    Distro
    Xubuntu 12.04 Precise Pangolin

    Re: Simple guide to grab desktop with FFMPEG

    and ?
    The best things in life are free, so what are we paying for?

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