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  • La file d’attente de SPIPmotion

    28 novembre 2010, par

    Une file d’attente stockée dans la base de donnée
    Lors de son installation, SPIPmotion crée une nouvelle table dans la base de donnée intitulée spip_spipmotion_attentes.
    Cette nouvelle table est constituée des champs suivants : id_spipmotion_attente, l’identifiant numérique unique de la tâche à traiter ; id_document, l’identifiant numérique du document original à encoder ; id_objet l’identifiant unique de l’objet auquel le document encodé devra être attaché automatiquement ; objet, le type d’objet auquel (...)

  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
    MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)

  • Contribute to documentation

    13 avril 2011

    Documentation is vital to the development of improved technical capabilities.
    MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
    To contribute, register to the project users’ mailing (...)

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  • ffmpeg hardcode subtitles, no subtitles but no output error

    8 février 2024, par Rafael Castelo

    I'm trying to hardcode subtitles for a project I'm working on : https://scriptme.io an mp4 files using an external SRT subtitles file.
Despite getting a succesful result as output :

    


    video:3923kB audio:975kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.344595%
[libx264 @ 0x63b08c0] frame I:9     Avg QP:15.65  size: 31298
[libx264 @ 0x63b08c0] frame P:609   Avg QP:20.37  size:  4283
[libx264 @ 0x63b08c0] frame B:1242  Avg QP:23.74  size:   907
[libx264 @ 0x63b08c0] consecutive B-frames:  3.3% 15.4% 23.1% 58.3%
[libx264 @ 0x63b08c0] mb I  I16..4: 21.5% 54.0% 24.5%
[libx264 @ 0x63b08c0] mb P  I16..4:  1.2%  2.7%  0.3%  P16..4: 18.7%  4.2%  1.6%  0.0%  0.0%    skip:71.4%
[libx264 @ 0x63b08c0] mb B  I16..4:  0.1%  0.1%  0.0%  B16..8: 13.9%  0.6%  0.0%  direct: 0.1%  skip:85.2%  L0:41.5% L1:56.8% BI: 1.7%
[libx264 @ 0x63b08c0] 8x8 transform intra:62.4% inter:86.2%
[libx264 @ 0x63b08c0] coded y,uvDC,uvAC intra: 36.7% 53.0% 15.0% inter: 2.2% 3.1% 0.1%
[libx264 @ 0x63b08c0] i16 v,h,dc,p: 42% 20% 13% 25%
[libx264 @ 0x63b08c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 33% 15% 28%  3%  4%  6%  4%  5%  3%
[libx264 @ 0x63b08c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 35% 23% 14%  4%  6%  7%  5%  4%  2%
[libx264 @ 0x63b08c0] i8c dc,h,v,p: 51% 17% 26%  6%
[libx264 @ 0x63b08c0] Weighted P-Frames: Y:0.2% UV:0.2%
[libx264 @ 0x63b08c0] ref P L0: 69.1%  9.6% 15.1%  6.1%
[libx264 @ 0x63b08c0] ref B L0: 87.2% 10.7%  2.1%
[libx264 @ 0x63b08c0] ref B L1: 97.9%  2.1%
[libx264 @ 0x63b08c0] kb/s:517.69
[aac @ 0x63b3600] Qavg: 257.742


    


    However once I play the video with any player, the subtitles aren't there.

    


    This is the command I'm using for the task

    


    ffmpeg -i https://some-bucket.s3.region.amazonaws.com/my-video.mp4 -f mp4 -vf subtitles=sub.srt subtitled-video.mp4


    


  • Low performance when extracting frames from video

    25 février 2016, par Rakatan

    I am writing a video processing application and have hit a bit of a snag.

    The idea is to extract frames (images) from a video file, process them on the GPU and then write them back to a new video file.

    So far i have been successful in doing this using JavaCV.

    The only problem is that extracting the frames takes a very long time (in the 200ms region). This is way to much, as added to the GPU processing time and the time it takes to write to a new file, it results in a total process duration of about 700ms per frame.

    This is how i grab the frames :

     FFmpegFrameGrabber frameGrabber = new FFmpegFrameGrabber(videoLocation);
    
 frameGrabber.start();
    

    
 frameGrabber.setFrameNumber(frameNumber);
    
 frame = frameGrabber.grabImage();

    Pretty standard, nothing special, and it works. I am able to process the frame, convert it to a bitmap, etc...

    As i have said before, the bottom two instructions (setting the frame number and grabbing the image) take a very very long time. Writing the frames also takes a fair bit.

    I would greatly appreciate if anyone has any input regarding this issue. Maybe i’m not setting up something correctly, maybe there is another solution that is faster.

  • lavf/ftp: check for truncation in snprintf

    25 novembre 2021, par Anton Khirnov
    lavf/ftp: check for truncation in snprintf

    Silences e.g. the following warning in gcc 10 :
    
src/libavformat/ftp.c : In function ‘ftp_move’ :
    
src/libavformat/ftp.c:1122:46 : warning : ‘%s’ directive output may be truncated writing up to 4095 bytes into a region of size 4091 [-Wformat-truncation=]
    
 1122 |     snprintf(command, sizeof(command), "RNTO %s\r\n", path) ;
    
      |                                              ^  
    
src/libavformat/ftp.c:1122:5 : note : ‘snprintf’ output between 8 and 4103 bytes into a destination of size 4096
    
 1122 |     snprintf(command, sizeof(command), "RNTO %s\r\n", path) ;
    
      |     ^ 
    • [DH] libavformat/ftp.c

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