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  • Les formats acceptés

    28 janvier 2010, par

    Les commandes suivantes permettent d’avoir des informations sur les formats et codecs gérés par l’installation local de ffmpeg :
    ffmpeg -codecs ffmpeg -formats
    Les format videos acceptés en entrée
    Cette liste est non exhaustive, elle met en exergue les principaux formats utilisés : h264 : H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 m4v : raw MPEG-4 video format flv : Flash Video (FLV) / Sorenson Spark / Sorenson H.263 Theora wmv :
    Les formats vidéos de sortie possibles
    Dans un premier temps on (...)

  • Ajouter notes et légendes aux images

    7 février 2011, par

    Pour pouvoir ajouter notes et légendes aux images, la première étape est d’installer le plugin "Légendes".
    Une fois le plugin activé, vous pouvez le configurer dans l’espace de configuration afin de modifier les droits de création / modification et de suppression des notes. Par défaut seuls les administrateurs du site peuvent ajouter des notes aux images.
    Modification lors de l’ajout d’un média
    Lors de l’ajout d’un média de type "image" un nouveau bouton apparait au dessus de la prévisualisation (...)

  • HTML5 audio and video support

    13 avril 2011, par

    MediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
    The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
    For older browsers the Flowplayer flash fallback is used.
    MediaSPIP allows for media playback on major mobile platforms with the above (...)

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  • How can I create a master m3u8 playlist for my encrypted sub-playlists (created with ffmpeg) ?

    11 janvier 2018, par mygov

    If I create three outputs with the following ffmpeg command for an encrypted HLS stream, how I am able to create a master.m3u8 variant playlist (with correct BANDWIDTH) ?

    ./ffmpeg -re -i Test_1080p.mp4 \
    
     -c:a aac -b:a 128k -c:v libx264 -s 1920x1080 -g 48 -keyint_min 48  -sc_threshold 0 -bf 3 -b_strategy 2 -b:v 7800k -maxrate 8600k -bufsize 7800k -f hls -hls_time 6 -hls_list_size 0 -hls_key_info_file enc.keyinfo ./1080p/index.m3u8 \
    
     -c:a aac -b:a 128k -c:v libx264 -s 1280x720 -g 48 -keyint_min 48 -sc_threshold 0 -bf 3 -b_strategy 2 -b:v 4500k -maxrate 5000k -bufsize 4500k -f hls -hls_time 6 -hls_list_size 0 -hls_key_info_file enc.keyinfo ./720p/index.m3u8 \
    
    -c:a aac -b:a 64k -c:v libx264 -s 640x360 -g 48 -keyint_min 48 -sc_threshold 0 -bf 3 -b_strategy 2 -b:v 730k -maxrate 800k -bufsize 730k -f hls -hls_time 6 -hls_list_size 0 -hls_key_info_file enc.keyinfo ./360p/index.m3u8

    Here is some example I found, but I think the BANDWIDTH-Value is not correct for my output files. How do I calculate the correct bandwidth ?

    #EXTM3U
    
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=150000,RESOLUTION=640x360
    
http://example.com/360p/index.m3u8
    
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=240000,RESOLUTION=1280x720
    
http://example.com/720p/index.m3u8
    
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=640000,RESOLUTION=1920x1080
    
http://example.com/1080p/index.m3u8

    The variantplaylistcreator-tool from Apple will not work in this case because I need .plist files, ffmpeg does not generate these files.

    I think ffmpeg is not able to create a master.m3u8 playlist for the generated output files..

  • Merge commit ’014852e932dab6e9cf2a53e7a17ce8321f3e922c’

    19 mars 2017, par Clément Bœsch
    Merge commit ’014852e932dab6e9cf2a53e7a17ce8321f3e922c’

    * commit ’014852e932dab6e9cf2a53e7a17ce8321f3e922c’ :
    
  simple_idct : arm : Drop disabled code variant
    

    Merged-by : Clément Bœsch <u@pkh.me>
    • [DH] libavcodec/arm/simple_idct_armv5te.S

  • Why is one ffmpeg webm dash stream much larger than the others ?

    5 janvier 2017, par ranvel

    Over the summer, I worked on putting together a script which took a x264 video/mp3 stream and broke it up into the different streams so that it would work via MSE-DASH. (Based heavily on the instructions on the webmproject.org website) Those same scripts have ceased to work, turning a 6GB video into several 25 Gb videos. I kept up with updates of ffmpeg and so I don’t know when it stopped working, but I am guessing it was due to the way that their DASH Webm implementation was updated.

    I found new method which works better, but still has a major problem with one stream. I was hoping someone could explain how this encoding works so that I could understand the underlying cause.

    #!/bin/bash
    
COMMON_OPTS="-map 0:0 -an -threads 11 -cpu-used 4 -cmp chroma"
    
WEBM_OPTS="-f webm -c:v vp9 -keyint_min 50 -g 50 -dash 1"
    

    
ffmpeg -i $1 -vn -acodec libvorbis -ab 128k audio.webm &amp;
    
ffmpeg -i $1 $COMMON_OPTS $WEBM_OPTS -b:v 500k -vf scale=1280:720 -y vid-500k.webm &amp;
    
ffmpeg -i $1 $COMMON_OPTS $WEBM_OPTS -b:v 700k -vf scale=1280:720 -y vid-700k.webm &amp; 
    
ffmpeg -i $1 $COMMON_OPTS $WEBM_OPTS -b:v 1000k -vf scale=1280:720 -y vid-1000k.webm &amp;
    
ffmpeg -i $1 $COMMON_OPTS $WEBM_OPTS -b:v 1500k -vf scale=1280:720 -y vid-1500k.webm  

    The transcode is not yet complete, but you can see where this is headed :

    -rw-r--r--  1 user  staff    87M Jan  4 23:27 audio.webm
    
-rw-r--r--  1 user  staff    27M Jan  4 23:42 vid-1000k.webm
    
-rw-r--r--  1 user  staff   285M Jan  4 23:42 vid-1500k.webm
    
-rw-r--r--  1 user  staff    15M Jan  4 23:42 vid-500k.webm
    
-rw-r--r--  1 user  staff    20M Jan  4 23:42 vid-700k.webm

    The 1500k variant is disproportionately larger than the other streams.

    The other problem is that when I use a shorter video, lets say eight or nine minutes, the above configuration runs as expected and everything is perfect. I don’t know where the limit for this is since each test costs a lot of processing power and time, but if it’s less than ten minutes, it works and if its longer than an hour, it produces massive files.

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