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  • D’autres logiciels intéressants

    12 avril 2011, par

    On ne revendique pas d’être les seuls à faire ce que l’on fait ... et on ne revendique surtout pas d’être les meilleurs non plus ... Ce que l’on fait, on essaie juste de le faire bien, et de mieux en mieux...
    La liste suivante correspond à des logiciels qui tendent peu ou prou à faire comme MediaSPIP ou que MediaSPIP tente peu ou prou à faire pareil, peu importe ...
    On ne les connais pas, on ne les a pas essayé, mais vous pouvez peut être y jeter un coup d’oeil.
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  • Encoding and processing into web-friendly formats

    13 avril 2011, par

    MediaSPIP automatically converts uploaded files to internet-compatible formats.
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    Audio files are encoded in MP3 and Ogg (supported by HTML5) and MP3 (supported by Flash).
    Where possible, text is analyzed in order to retrieve the data needed for search engine detection, and then exported as a series of image files.
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  • Création définitive du canal

    12 mars 2010, par

    Lorsque votre demande est validée, vous pouvez alors procéder à la création proprement dite du canal. Chaque canal est un site à part entière placé sous votre responsabilité. Les administrateurs de la plateforme n’y ont aucun accès.
    A la validation, vous recevez un email vous invitant donc à créer votre canal.
    Pour ce faire il vous suffit de vous rendre à son adresse, dans notre exemple "http://votre_sous_domaine.mediaspip.net".
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Sur d’autres sites (5400)

  • How to build SDL libraries for Android

    4 mars 2013, par Harish

    I am planning to use SDL (Simple DirectMedia Layer) to display video output in my Android application that uses ffmpeg libraries. I have downloaded the sources from http://www.libsdl.org/download-1.2.php and built (./configure, make & make install) on my Ubuntu. But when I use these .so files the Android ndk-build complains that "Could not read symbols. File in wrong Format".

    Can I use the .so files that are built on Ubuntu on Android or do I need to build the SDL for Android in a different way ?

  • how to download panopto videos using ffmpeg ?

    22 novembre 2022, par RainBat

    I want to download a panopto video, which has two separate streams, a main and secondary.
    
for example :Getting Started welcome to Panoptoenter image description here

    


    when i download each of them with ffmpeg using ffmpeg -i INDEXLink -c copy "FileName.mkv",
they aren't of same length one is 4:08 and the other is 3:24, this is just in this example in other videos it might be double the other in length.
    
is it possible to download the two streams as they are displayed in the website under length 3:24 ?

    


  • Using FFMPEG to merge video frames back into a video with subtitle messes up the audio when seeking

    26 juin 2023, par YoungDON

    I broke down a h265 video into frames and try to merge them back together with its original audio, subtitle and fonts. The resulting video has an issue where when I try to seek at some points in the video, the audio stops playing. And even when I don't seek, at a point the video hangs and the audio keeps playing. Seconds later, the video resumes, but now, video and audio are out of sync. This doesn't happen with the original video.

    


    The reason I'm breaking the video into frames and merging them is because I want to upscale each frame. But I'm going to leave that part out because this issue occurs with the original unscaled frames.

    


    Here's the details of the original video. Notice it has video, audio and two font streams.

    


    .\ffmpeg.exe -i "input.mkv"

Input #0, matroska,webm, from 'input.mkv':
  Metadata:
    encoder         : libebml v1.3.10 + libmatroska v1.5.2
    creation_time   : 2021-01-07T00:20:19.000000Z
  Duration: 00:23:02.05, start: 0.000000, bitrate: 320 kb/s
    Stream #0:0: Video: hevc (Main), yuv420p(tv), 1280x720, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 1k tbn, 23.98 tbc (default)
    Metadata:
      BPS-eng         : 278671
      DURATION-eng    : 00:23:02.006000000
      NUMBER_OF_FRAMES-eng: 33135
      NUMBER_OF_BYTES-eng: 48140731
      _STATISTICS_WRITING_APP-eng: mkvmerge v46.0.0 ('No Deeper Escape') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2021-01-07 00:20:19
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:1(jpn): Audio: aac (HE-AAC), 48000 Hz, stereo, fltp
    Metadata:
      BPS-eng         : 36166
      DURATION-eng    : 00:23:02.016000000
      NUMBER_OF_FRAMES-eng: 32391
      NUMBER_OF_BYTES-eng: 6247833
      _STATISTICS_WRITING_APP-eng: mkvmerge v46.0.0 ('No Deeper Escape') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2021-01-07 00:20:19
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:2(eng): Subtitle: ass (default)
    Metadata:
      BPS-eng         : 76
      DURATION-eng    : 00:21:20.790000000
      NUMBER_OF_FRAMES-eng: 246
      NUMBER_OF_BYTES-eng: 12264
      _STATISTICS_WRITING_APP-eng: mkvmerge v46.0.0 ('No Deeper Escape') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2021-01-07 00:20:19
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:3: Attachment: ttf
    Metadata:
      filename        : Roboto-Medium.ttf
      mimetype        : application/x-truetype-font
    Stream #0:4: Attachment: ttf
    Metadata:
      filename        : Roboto-MediumItalic.ttf
      mimetype        : application/x-truetype-font


    


    Here's how I break it into frames

    


    .\ffmpeg.exe -i "input.mkv" -qscale:v 1 -qmin 1 -qmax 1 -vsync 0 "InputFolder/frame%08d.png"


    


    Here's how I merge the frames back to video with all the original streams except the video

    


    .\ffmpeg.exe -r 23.98 -i "InputFolder\frame%08d.png" -i "input.mkv" -map 0:v:0 -map 1 -map -1:v -c:a copy -c:v libx265 -r 23.98 -pix_fmt yuv420p "output.mkv"


    


    Here's the details of the resulting video :

    


    .\ffmpeg.exe -i "output.mkv"

Input #0, matroska,webm, from 'output.mkv':
  Metadata:
    ENCODER         : Lavf58.45.100
  Duration: 00:23:02.05, start: 0.000000, bitrate: 245 kb/s
    Stream #0:0: Video: hevc (Main), yuv420p(tv), 1280x720 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 23.98 tbc (default)
    Metadata:
      ENCODER         : Lavc58.91.100 libx265
      DURATION        : 00:23:01.777000000
    Stream #0:1(jpn): Audio: aac (HE-AAC), 48000 Hz, stereo, fltp (default)
    Metadata:
      BPS-eng         : 36166
      DURATION-eng    : 00:23:02.016000000
      NUMBER_OF_FRAMES-eng: 32391
      NUMBER_OF_BYTES-eng: 6247833
      _STATISTICS_WRITING_APP-eng: mkvmerge v46.0.0 ('No Deeper Escape') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2021-01-07 00:20:19
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      DURATION        : 00:23:02.046000000
    Stream #0:2(eng): Subtitle: ass (default)
    Metadata:
      BPS-eng         : 76
      DURATION-eng    : 00:21:20.790000000
      NUMBER_OF_FRAMES-eng: 246
      NUMBER_OF_BYTES-eng: 12264
      _STATISTICS_WRITING_APP-eng: mkvmerge v46.0.0 ('No Deeper Escape') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2021-01-07 00:20:19
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      ENCODER         : Lavc58.91.100 ssa
      DURATION        : 00:21:21.580000000
    Stream #0:3: Attachment: ttf
    Metadata:
      filename        : Roboto-Medium.ttf
      mimetype        : application/x-truetype-font
    Stream #0:4: Attachment: ttf
    Metadata:
      filename        : Roboto-MediumItalic.ttf
      mimetype        : application/x-truetype-font


    


    One thing to note is that I've done this successfully numerous times with h264 videos. No audio issues. Another thing to note which might be more relevant is that when I merge the frames with only the original audio stream (as opposed to all original streams except video), the audio issue does not occur.

    


    .\ffmpeg.exe -r 23.98 -i "InputFolder\frame%08d.png" -i "input.mkv" -map 0:v:0 -map 1:a:0 -c:a copy -c:v libx265 -r 23.98 -pix_fmt yuv420p "output.mkv"

Produces no audio issues. But this isn't good for me because I want the subtitles and fonts from the original video.


    


    If anyone needs me to upload the original video somewhere so they can reproduce it, let me know.

    


    Edit : Also note that Merging the frames with the original audio AND subtitle stream, i.e without the fonts, the issue remains.

    


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