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  • 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 (...)

  • Des sites réalisés avec MediaSPIP

    2 mai 2011, par

    Cette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
    Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page.

  • 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 (...)

Sur d’autres sites (11508)

  • FFMPEG Audio, video out of sync

    5 mars 2012, par geeknizer

    I'm creating Video using FFMPEG from pngs. The problem is on creating the video, and combining with video, its never in sync.

    Create video :

    ffmpeg -i /home/ubuntu/pngs/* -vcodec libvpx -r 25 -b 1024k -y video.avi

    generate audio

    ffmpeg -y -f s16le -ar 44100 -ac 2 -i wav_file.wav -acodec libvorbis video.avi

    these snapshots were taken at 25fps from a video. Audio is also extracted from same source.

  • How to quantify and compare video quality

    24 mars 2015, par user940154

    I have a set of uncompressed videos in YUV format.

    I have obtained several derived copies in various formats and resolutions from these yuv files using FFmpeg transcoding. (YUVs ----> X Derived Copies)

    What I have also done is, transcode the yuv’s into same resolution AVIs, and now obtained the same set of derived (transcoded) videos treating the AVIs as master. (AVIs ----> X Derived Copies)

    Now I wish to compare the quality of transcoded videos, when derived from AVIs to those derived from YUVs.

    Is there any way for me to do this using FFmpeg. How ? If not, can you please suggest some good open source software to do this.

    Thanks

  • How to optimize video to animated GIF conversion using PHP + shell commands

    15 mars 2012, par user1070798

    I have a web application that converts any video into an animated GIF. The app runs in PHP and the following steps are executed through php's shell_exec :

    1. Scale video to smaller dimensions, if they are large (ffmpeg -i $in -s 200x150 -an $out)
    2. Use ffmpeg to extract 1 jpeg every x seconds (ffmpeg -i $in -ss $ss -vframes 1 $out)

    3. Convert jpegs to animated GIF using imagick (convert -delay $delay -loop 0 $dir/* $out)

      aside - the reason I don't use the ffmpeg gif89a output is because the quality sucks.

    I want to be able to except any major image format, but the most common will probably be .flv (flash) and .avi/.mpg.

    My application runs fine, but I am a perfectionist and it needs to be faster for scalability.

    My web server has 16 cores and I would like to utilize them as much as possible, but .flv multi-threading appears to not be supported by ffmpeg, while .avi and some others are supported. Also, ffmpeg doesn't support multi-threading when outputting to jpegs.

    Does anyone know of any other programs that support multi-threading for .flv and others ? Are there any more efficient methods to create an animated GIF from video, while maintaining relatively decent quality (aka not the 100-color palette that ffmpeg supports) ?

    Also, if anyone knows which codecs might perform best for stages 1 and 2, particularly with flv, I'd love to know. I've done hours of testing, but there are just so many options I haven't come to any solid conclusions.

    ***Update : My online app is working well so far animated gif generator. I would still love to make it faster though, so if anyone has run into similar circumstances... let me know !

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