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  • Submit bugs and patches

    13 avril 2011

    Unfortunately a software is never perfect.
    If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
    If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
    You may also (...)

  • Support audio et vidéo HTML5

    10 avril 2011

    MediaSPIP utilise les balises HTML5 video et audio pour la lecture de documents multimedia en profitant des dernières innovations du W3C supportées par les navigateurs modernes.
    Pour les navigateurs plus anciens, le lecteur flash Flowplayer est utilisé.
    Le lecteur HTML5 utilisé a été spécifiquement créé pour MediaSPIP : il est complètement modifiable graphiquement pour correspondre à un thème choisi.
    Ces technologies permettent de distribuer vidéo et son à la fois sur des ordinateurs conventionnels (...)

  • HTML5 audio and video support

    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.
    The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
    For older browsers the Flowplayer flash fallback is used.
    MediaSPIP allows for media playback on major mobile platforms with the above (...)

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  • ffmpeg-Error "Buffer queue overflow, dropping." when merging two videos with delay

    20 septembre 2016, par Stefan Urbansky

    I want to merge two videos (as example the iphone video from https://peach.blender.org/trailer-page/). The videos are placed on an background image with the overlay filter and the second video starts 3 seconds later.

    And I need that the audio is mixed.

    Here is my code :

    ffmpeg \
    
    -loop 1 -i background.png  \
    
    -itsoffset 0  -i trailer_iphone.m4v \
    
    -itsoffset 3  -i trailer_iphone.m4v \
    
    \
    
    -y \
    
    -t 36 \
    
    -filter_complex "
    
        [2:a] adelay=3000 [2delayed];
    
        [1:a][2delayed] amerge=inputs=2 [audio];
    
        [0][1:v] overlay=10:10:enable='between(t,0,33)' [lv1];
    
        [lv1][2:v] overlay=10:300:enable='between(t,0,36)' [video]
    
    " \
    
    \
    
    -threads 0 \
    
    -map "[video]" -map "[audio]" \
    
    -vcodec libx264 -acodec aac \
    
    merged-video.mp4

    I get the error message :

    [Parsed_overlay_3 @ 0x7fe892502ac0] [framesync @ 0x7fe892502b88] Buffer queue overflow, dropping.

    And the merged video has many dropped frames.

    I know that are some other posting with this error message. But the suggested solutions doesn’t work for me.

    How can I fix the problem ?

  • Yes or no, will ffmpeg api do hardware decoding on iOS ?

    15 janvier 2019, par Fattie

    There seems to be conflicting information on this.

    https://trac.ffmpeg.org/wiki/HWAccelIntro

    notice the first diagram, it firmly marks iOS as “Y” on VideoToolbox

    enter image description here

    however in the comments down the bottom it says

    VideoToolbox. ​VideoToolbox, only supported on macOS. H.264 decoding is available in FFmpeg/libavcodec.

    And in the confusing second diagram it says "Standalone" is not done for VideoToolbox.

    We have found that using ffmpeg compiled in to iOS .... it seems to not use hardware decoding, which is really a pain.

    1. With avcodec_get_hw_config() we get AV_PIX_FMT_VIDEOTOOLBOX, AV_HWDEVICE_TYPE_VIDEOTOOLBOX which is seemingly correct.

    2. But usage and framerates clearly shows everything is being done in CPU. The code is in ff_hevc_hls_residual_coding all the time. (That’s fffmpeg’s software decoder.)

    3. This very diff very long git.videolan.org URL here seems to suggest again it should all be working.

    4. Have tried every iPhone etc. of course

  • Merge remote-tracking branch ’cehoyos/master’

    25 juillet 2013, par Michael Niedermayer
    Merge remote-tracking branch ’cehoyos/master’

    * cehoyos/master :
    
  Show max bitrate for mpeg2 video streams in avcodec_string().
    
  Allow native compilation on the iPhone.
    

    Merged-by : Michael Niedermayer <michaelni@gmx.at>
    • [DH] configure
    • [DH] libavcodec/utils.c

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