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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 (...)

  • MediaSPIP v0.2

    21 juin 2013, par

    MediaSPIP 0.2 is the first MediaSPIP stable release.
    Its official release date is June 21, 2013 and is announced here.
    The zip file provided here only contains the sources of MediaSPIP in its standalone version.
    To get a working installation, you must manually install all-software dependencies on the server.
    If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...)

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  • How to stitch(concat) two transport stream with two different resolution and I-frame slices format without loosing resolution and slices information

    2 octobre 2019, par ART

    I have been trying to test a use case with steam captured from multimedia device and that didn't work. And then I have been trying to create this specific transport stream for like two days now without success, so requesting some help.

    



    I need to create transport stream with two different resolution and two different slicing format.

    



    I divided the task in following steps and in last two steps I need help.

    



    Step 1 : Download sample video with resolution : 1920x1080.
    
 I downloaded big buck bunny mp4 .

    



    Step 2 : Create transport stream with following
    
resolution : 1920x720, H264 I frame slices per frame : 1
    
I used following ffmpeg commands to do that.

    



    #Rename file to input.mp4
$ mv bbb_sunflower_1080p_30fps_normal.mp4 input.mp4
#Extract transport stream
$ ffmpeg -i input.mp4 -c copy first.ts


    



    first.ts is having 1980x720 resolution and one H264 I slice per frame.

    



    Step 3 : Create another transport stream with smaller resolution using following commands

    



    #Get mp4 with lower resolution.
$ ffmpeg -i input.mp4 -s 640x480 temp.mp4
#Extract trans port stream from mp4
$ ffmpeg -i temp.mp4 -c copy low_r.ts


    



    Step 4 : Edit(and re-encode ?) low_r.ts to have two H264 I frame slices.
I used following command to achieve it.

    



    $ x264 --slices 4 low_r.ts -o second.ts


    



    However when I play this second.ts on vlc using following command it doesn't play

    



    $ vlc ./second.ts 


    



    And using Elacard StreamEye software when I analyze the transport stream I see that it has 4 H264 I slices in only two times other than that lot of H264 p slices and H264 B slices. 
Need help here to figure out why second.ts doesn't play and why slicing is not correct.

    



    Step 5 : Combine both the transport stream without loosing resolution and slicing information.
Don't know command for this. Need help here.
I tried ffmpeg but that combines two stream with different resolution and makes one file with one resolution.

    



    Any suggestions/pointers would help me proceed. Let me also know if any of the above steps are not fine too.

    


  • avcodec/vc1 : Check for excessive resolution

    8 août 2019, par Michael Niedermayer
    avcodec/vc1 : Check for excessive resolution

    Fixes : overflow in aspect ratio calculation
    
Fixes : signed integer overflow : 393215 * 14594 cannot be represented in type 'int'
    
Fixes : 15728/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMV3IMAGE_fuzzer-5661588893204480
    

    Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
    
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libavcodec/vc1.c

  • avcodec/vqavideo : Limit resolution

    22 août 2019, par Michael Niedermayer
    avcodec/vqavideo : Limit resolution

    Fixes : Timeout (288sec -> 1ms)
    
Fixes : 16353/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VQA_fuzzer-5633402606190592
    

    Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
    
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libavcodec/vqavideo.c

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