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Autres articles (56)

  • Other interesting software

    13 avril 2011, par

    We don’t claim to be the only ones doing what we do ... and especially not to assert claims to be the best either ... What we do, we just try to do it well and getting better ...
    The following list represents softwares that tend to be more or less as MediaSPIP or that MediaSPIP tries more or less to do the same, whatever ...
    We don’t know them, we didn’t try them, but you can take a peek.
    Videopress
    Website : http://videopress.com/
    License : GNU/GPL v2
    Source code : (...)

  • 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.
    Videopress
    Site Internet : (...)

  • Possibilité de déploiement en ferme

    12 avril 2011, par

    MediaSPIP peut être installé comme une ferme, avec un seul "noyau" hébergé sur un serveur dédié et utilisé par une multitude de sites différents.
    Cela permet, par exemple : de pouvoir partager les frais de mise en œuvre entre plusieurs projets / individus ; de pouvoir déployer rapidement une multitude de sites uniques ; d’éviter d’avoir à mettre l’ensemble des créations dans un fourre-tout numérique comme c’est le cas pour les grandes plate-formes tout public disséminées sur le (...)

Sur d’autres sites (6398)

  • ffmpeg video encode .mp4 for webserver

    23 août 2016, par Nandex Sierra

    I have a lot of mini-videos (from 1 to 10 seconds) and the size of each is about 5-10MB. I have a Apache server and I want to reproduce the videos from the url (http://localhost/videoX.mp4)

    I have a big problem, the video takes to start about 12seconds and I think that this is a lot of time. Somebody knows how encode the video or a platform to upload my videos ??

    Im using this :

    ffmpeg -i video_X.mp4 -vcodec libx264 -crf 20 -movflags faststart videoX.mp4

    Thanks in advance !

  • FFmpeg capture, mkvtimestamp_v2 and timecode don't play nice

    24 mai 2021, par Bouke

    Trying to capture and modify the TC in-file afterwards.
I've found a nice way to store the timestamps from the capture.
Gyan's brillant filterchain

    


    This works fine using this line :

    


    ffmpeg -hide_banner -f "decklink" -queue_size "1073741824" -raw_format "auto" -format_code "Hi50" -video_input "sdi" -i "bm mini One" -filter_complex "settb=1/1000,setpts=RTCTIME/1000-1500000000000,mpdecimate,split[out][ts];[out]setpts=N/25/TB[out]" -map "[out]" -c:a "copy" -c:v "prores" -profile:v "1" -vendor "ap10" -pix_fmt "yuv422p10le" "/Volumes/Data/tst1.mov" -map "[ts]" -f mkvtimestamp_v2 "/Volumes/Data/time.txt" -vsync 0


    


    But, when I add -timecode "00:00:00:00" (to force a TC atom in the output), horrible things happen.

    


    ffmpeg -f "decklink" -queue_size "1073741824" -raw_format "auto" -format_code "Hi50" -video_input "sdi" -i "bm mini One" -filter_complex "settb=1/1000,setpts=RTCTIME/1000-1500000000000,mpdecimate,split[out][ts];[out]setpts=N/25/TB[out]" -map "[out]" -timecode "00:01:00:00" -c:a "copy" -c:v "prores" -profile:v "1" -vendor "ap10" -pix_fmt "yuv422p10le" "/Volumes/Data/tst1.mov" -map "[ts]" -f mkvtimestamp_v2 "/Volumes/Data/time.txt" -vsync 0


    


    The timecode does not run at the video speed, skips a frame or two here and there, and the image freezes after a random amount of time (between 10 seconds and a minute or so).

    


    How come the timecode can mess up stuff that much ? From what I understand it's just a couple of atoms in the moov atom, and a reference where the actual TC value (as frames) is stored in the mdat.

    


    I highly suspect the -vsync 0 to also work on the video, and I've had issues with that before. If I omit that, the video is fine, the TC is fine, but there is no metadata output, just the # timecode format v2

    


  • Correct way to dump yuv values after avcodec_decode_video2

    27 juin 2017, par Peter

    I am decoding H.265 raw data :

     avcodec_decode_video2(decoderCtx, pictYUV, &gotPicture, &packet)

    After the call, the value for pictYUV->format is AV_PIX_FMT_YUV420P as expected.

    I dump raw yuv values to a file as follows :

    fwrite(pictYUV->data[0], 1, w*h, f);
    
fwrite(pictYUV->data[2], 1, w*h/4, f);
    
fwrite(pictYUV->data[1], 1, w*h/4, f);

    For an input size of 640x480, when the file is viewed (using ImageMagick display utility), the image is what was expected.

    However, for an input size of 864x480, the image appears to be corrupted.

    What is interesting is if I run pictYUV through sws_scale, and dump the resulting yuv output, the image appears to be fine.

    sws_scale(swsCtx, pictYUV->data, pictYUV->linesize, 0, pictYUV->height,
    
  pictNewYUV->data, pictNewYUV->linesize);

    All I need is yuv data. I am hoping I can avoid the extra call to sws_scale. Wondering what is it that I am missing. Regards.

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