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Thread: HOWTO: Proper Screencasting on Linux

  1. #151
    Join Date
    Sep 2006
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    3,442

    Re: HOWTO: Proper Screencasting on Linux

    If you want to use the last commit that worked then do:
    Code:
    sudo apt-get remove ffmpeg
    cd ~/ffmpeg
    make distclean
    git pull
    git checkout 8bfd7f6a475225a0595bf657f8b99a8fffb461e4
    ./configure, make, checkinstall as shown in the FFmpeg compile guide.
    make distclean
    git checkout master
    ron999: I didn't see your last post. Strange. This commit works for me on 32-bit Natty.

  2. #152
    Join Date
    Jul 2011
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    3

    Re: HOWTO: Proper Screencasting on Linux

    Quote Originally Posted by FakeOutdoorsman View Post
    If you want to use the last commit that worked then do:
    Code:
    sudo apt-get remove ffmpeg
    cd ~/ffmpeg
    make distclean
    git pull
    git checkout 8bfd7f6a475225a0595bf657f8b99a8fffb461e4
    ./configure, make, checkinstall as shown in the FFmpeg compile guide.
    make distclean
    git checkout master
    ron999: I didn't see your last post. Strange. This commit works for me on 32-bit Natty.
    The following command works for me! Thanks FakeOutdoorsman!
    ffmpeg -f alsa -ac 2 -i pulse -f x11grab -r 30 -s 1366x768 -i :0.0 -acodec pcm_s16le -vcodec libx264 -vpre lossless_ultrafast -threads 0 output.mkv
    By the way, why have "ctrl+c" to stop screencasting instead of "q"?

  3. #153
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    Sep 2006
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    Re: HOWTO: Proper Screencasting on Linux

    Quote Originally Posted by cadens View Post
    By the way, why have "ctrl+c" to stop screencasting instead of "q"?
    I blame ffmpeg: get rid of the 'q' key schizofrenia.

    I think it's some flotsam that was merged from libav (the FFmpeg fork).

  4. #154
    Join Date
    Sep 2006
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    3,442

    Re: HOWTO: Proper Screencasting on Linux

    Two new x11grab options have been added: follow_mouse and show_region.
    Code:
    -follow_mouse 100 -show_region 1
    From the documentation:
    • follow_mouse - Only follows when mouse pointer reaches within 100 pixels to the edge of region.
    • show_region - The grabbing region will be indicated on screen.

    If you use both options then, "the grabbing region indication will follow the mouse pointer".

  5. #155
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    Sep 2006
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    Re: HOWTO: Proper Screencasting on Linux

    Quote Originally Posted by rongden View Post
    great guide . I'll test
    Are you a robot?

  6. #156
    Join Date
    May 2009
    Location
    Alabama
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    25
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Re: HOWTO: Proper Screencasting on Linux

    Quote Originally Posted by verb3k View Post
    Example 1:

    Code:
    ffmpeg -i output.mkv -acodec libfaac -ab 128k -ac 2 -vcodec libx264 -preset slow -crf 22 -threads 0 our-final-product.mp4
    In the above example, we encode the audio to AAC at a bitrate of 128k with 2 audio channels (stereo). We encode the video to the high quality H.264 video compression standard. We use the preset "slow" and a CRF value of 22 for rate control. The output file will be named “our-final-product.mp4″ and will be muxed in an .mp4 container. Note that FFmpeg determines the container format of the output file based on the extension you specify (i.e. if you specify the extension as .mkv, your file will be muxed into an .mkv matroska container). You can tweak the CRF value to get different results. The lower you set the CRF value, the better your video’s quality will be, and consequently the file size and encoding time will increase, and vice-versa.
    When I tried to use this (Ubuntu 10.10 / ffmpeg SVN-r25943) an error occurred stating "Unrecognized option 'preset'"

    I seem to have fixed it though by replacing "-preset" with "-vpre" although I didn't take into account "-apre" so I don't know if leaving that out would cause any issues.

    I have tested the final output file when using -vpre and it seems to work fine without utilizing -apre

    Hope this helps anyone having the same issue.
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  7. #157
    Join Date
    Aug 2007
    Location
    Olympia, Washington - US
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    33
    Distro
    Ubuntu 10.04 Lucid Lynx

    Question Re: HOWTO: Proper Screencasting on Linux

    Great tutorial

    I get magnificent grabs of World of Warcraft with this, and can run them through re-encoding for upload to youtube for my guild. No problemo, but...I cannot find a video editor that reads the raw output of the tutorial's command. I could re-encode it to a lower quality format and then edit it, but that really defeats the purpose.

    So, what editor is recommended to edit the raw...or is there a better version of raw to use if editing is desired?

    btw, WinFF is also a very nice front-end for anyone not understanding the nuts and bolts of the command line for re-encoding...just sayin.

    Thanks for any help on this folks.
    Mankind is my religion, of course I use GNU/Linux!

  8. #158
    Join Date
    Nov 2010
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    271
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Re: HOWTO: Proper Screencasting on Linux

    very nice tutorial ^^

    btw.. anybody know how to use the -newaudio option in ffmpeg ??...I mean the syntax sequence? In the man page its not clear :-/

    I want to add a new audio stream to a video recorded with -an (no audio).

  9. #159
    Join Date
    Jun 2006
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    Re: HOWTO: Proper Screencasting on Linux

    Quote Originally Posted by cadens View Post
    Hi Ron999!
    It's working here with "-acodec flac" instead of "-acodec pcm_s16le".
    Thanks!

    So the problem is the pcm audio codec?
    Thanks i will try flac now

    This error only occurs when im using pulse ( -i pulse), with alsa ( -i hw:0,0 ) it runs fine if anyone is wondering.

    [matroska @ 0x981a040] Application provided invalid, non monotonically increasing dts to muxer in stream 1: 1 >= 1
    So She Said Internet, And I Said Inter-Not



  10. #160
    Join Date
    May 2010
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    9

    Unhappy Re: HOWTO: Proper Screencasting on Linux

    Why did you delete your post!? ARGGG!
    http://web.archive.org/web/201003221....php?t=1392026

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