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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 (...)

  • Script d’installation automatique de MediaSPIP

    25 avril 2011, par

    Afin de palier aux difficultés d’installation dues principalement aux dépendances logicielles coté serveur, un script d’installation "tout en un" en bash a été créé afin de faciliter cette étape sur un serveur doté d’une distribution Linux compatible.
    Vous devez bénéficier d’un accès SSH à votre serveur et d’un compte "root" afin de l’utiliser, ce qui permettra d’installer les dépendances. Contactez votre hébergeur si vous ne disposez pas de cela.
    La documentation de l’utilisation du script d’installation (...)

  • Automated installation script of MediaSPIP

    25 avril 2011, par

    To overcome the difficulties mainly due to the installation of server side software dependencies, an "all-in-one" installation script written in bash was created to facilitate this step on a server with a compatible Linux distribution.
    You must have access to your server via SSH and a root account to use it, which will install the dependencies. Contact your provider if you do not have that.
    The documentation of the use of this installation script is available here.
    The code of this (...)

Sur d’autres sites (5825)

  • Reporting duplicated frames with FFmpeg

    10 juillet 2018, par Calculon

    I am looking for a method to report (not just detect and remove) duplicated frames of video detected by FFmpeg - similar to how you can print out blackdetect, cropdetect, silencedetect, etc.

    For example :

    ffmpeg -i input.mp4 -vf blackdetect -an -f null - 2>&1 | grep blackdetect > output.txt

    Outputs something like :

    [blackdetect @ 0x7f8032f03680] black_start:5.00501 black_end:7.00701 black_duration:2.002

    But there’s no "dupedetect" filter as far as I know, so I’m looking for any ideas/workarounds to get a read of where frames are duplicated.

  • ffmpeg - how can I scale the video while perserving the total frames in it ?

    14 juin 2018, par choz

    I have a video with a size of 515 x 755, that I would like to resize proportionally to 206 x 302 (so, factor is 2.5).

    In this video, I have the total of 588 frames, and I use ffmpeg to scale it, with this command.

    ffmpeg -i video.mp4 -vf scale=206:-1 xRotation_206.mp4

    And I use this to check how many frames are there in the video, based on this answer.

    ffmpeg -i video.mp4 -map 0:v:0 -c copy -f null - 2>&1 | awk '/frame=/ {print $2}'

    The original video frames is good (588 frames). But, after resizing with the command above, my converted video now has 604 frames.

    The question is, how can I resize the video by preserving the total frames in it ? It doesn’t really have to be ffmpeg approach, and any suggestion is appreciated.

    Here’s the sample video that I use : Link

  • Create I Frame out of P and B frames

    15 mai 2018, par Eugene Alexeev

    I’ve written a C++ converter based on FFMpeg which can receive a link to hls-stream and convert it into local .mp4 video. So far, so good, converter works like a charm, no questions about that.

    PROBLEM : No matter what input source I’m providing to the converter, at the end of convertation I need to receive video with key-frames ONLY. I need such video due to perfect seeking forward and reverse.

    It’s a well-known fact that subsidiary video frames (P and B) dependent on their owner-frame (I frame), because this frame contains full pixel map. According to that, we can recreate a I frame for each P and B frame by merging their data with their I frame. That’s why such ffmpeg command ffmpeg -i video.mp4 output%4d.jpg works.

    QUESTION : How can I implement an algorithm of merging of frames in order to recreate Key-frames ONLY video at the end ? What kind of quirks I need to know about merging datas of AVPackets ?

    Thanks.

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