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    MediaSPIP automatically converts uploaded files to internet-compatible formats.
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    13 avril 2011, par

    MediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
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Sur d’autres sites (7366)

  • delay in lyrics shown when concat video with lyrics with an intro video using ffmpeg

    19 mars 2018, par no name

    I have a video with lyrics I add the lyrics used ffmpeg too. I have the lyrics in lrc formate and i change it to ass lyrics formate then I start to add it to my video using this command

    ffmpeg -i video.mp4 -vf "ass=out.ass,fade=in:0:30" -y amr.mp4

    I use fade=in:0:30 to make fade in the start of the video so when I start merge intro video my original video not start at once but to have some fade in, in the start to have a good view.
    then I start to add the intro video using a text file which has this

    file intro.mp4
    
file amr.mp4

    then I merge them using this command

    ffmpeg -f concat -safe 0 -i out.txt -c copy -y final.mp4

    i got these message

    [mov,mp4,m4a,3gp,3g2,mj2 @ 03eadb80] Auto-inserting h264_mp4toannexb bitstream filter
    
[mp4 @ 06419580] Non-monotonous DTS in output stream 0:1; previous: 310272,     current: 285626; changing to 310273. This may result in incorrect timestamps in   the output file.

    repeated many times.
    when i watch the final video the lyrics have some delay from the sound the problem appeared when I merge the intro video but without it the lyrics have no problem so what I made wrong make the lyrics shown in this way and not in the right timing as it should have no problems as I merge only the intro video and after add the lyrics to the original one
    Thanks in advance

  • desktop recording - ffmpeg settings for high quality youtube videos

    21 mars 2018, par pb.

    I am trying to record short video of my desktop and upload it to youtube.
    The problem is that every time when I upload it to youtube or even dropbox (as video), the quality is much worse.

    My ffmpeg execution :

    ffmpeg -f x11grab -s 1366x768 -r 30 -i :0.0 -codec:v libx264 -crf 10 -bf 20 -flags +cgop -pix_fmt yuv440p -movflags faststart help.mp4

    based on :

    ffmpeg -i <input file="file" /> -codec:v libx264 -crf 21 -bf 2 -flags +cgop -pix_fmt yuv420p -codec:a aac -strict -2 -b:a 384k -r:a 48000 -movflags faststart .mp4

    which I found here

    Original file (.zip) :
    https://www.dropbox.com/s/xlkr83rkqfxon23/help.mp4.zip?dl=0

    File after upload to youtube :
    https://www.youtube.com/watch?v=ewEUgpXOpmg

    As you can see, I loss quality after upload to youtube.

    Could you help me ?
    How should I choose the appropriate parameters to record and upload high quality video ?

  • desktop recording - ffmpeg settings for high quality youtube videos

    21 mars 2018, par pb.

    I am trying to record short video of my desktop and upload it to youtube.
    The problem is that every time when I upload it to youtube or even dropbox (as video), the quality is much worse.

    My ffmpeg execution :

    ffmpeg -f x11grab -s 1366x768 -r 30 -i :0.0 -codec:v libx264 -crf 10 -bf 20 -flags +cgop -pix_fmt yuv440p -movflags faststart help.mp4

    based on :

    ffmpeg -i <input file="file" /> -codec:v libx264 -crf 21 -bf 2 -flags +cgop -pix_fmt yuv420p -codec:a aac -strict -2 -b:a 384k -r:a 48000 -movflags faststart .mp4

    which I found here

    Original file (.zip) :
    https://www.dropbox.com/s/xlkr83rkqfxon23/help.mp4.zip?dl=0

    File after upload to youtube :
    https://www.youtube.com/watch?v=ewEUgpXOpmg

    As you can see, I loss quality after upload to youtube.

    Could you help me ?
    How should I choose the appropriate parameters to record and upload high quality video ?

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