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Autres articles (60)

  • Contribute to documentation

    13 avril 2011

    Documentation is vital to the development of improved technical capabilities.
    MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
    To contribute, register to the project users’ mailing (...)

  • 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 (...)

  • Selection of projects using MediaSPIP

    2 mai 2011, par

    The examples below are representative elements of MediaSPIP specific uses for specific projects.
    MediaSPIP farm @ Infini
    The non profit organizationInfini develops hospitality activities, internet access point, training, realizing innovative projects in the field of information and communication technologies and Communication, and hosting of websites. It plays a unique and prominent role in the Brest (France) area, at the national level, among the half-dozen such association. Its members (...)

Sur d’autres sites (5707)

  • FFmpeg : Different color brightness converting mov to mp4 with alpha

    3 août 2023, par Miguel Zafra

    I am using this code :

    


    ffmpeg -i in.mov -c:v hevc_videotoolbox -allow_sw 1 -alpha_quality 0.9 -tag:v hvc1 -q:v 100 -vf premultiply=inplace=1 out-n.mp4


    


    To convert my MOV with alpha to MP4 with alpha for a web use. However the export color is different.

    


    Original :

    


    enter image description here

    


    MP4 Export :

    


    enter image description here

    


    Any idea of how can I keep the original MOV colors ?

    


    Thank you

    


  • ffv1dec : plane_index is 1 in case of version 4 gray+alpha.

    2 mai 2015, par Jérôme Martinez
    ffv1dec : plane_index is 1 in case of version 4 gray+alpha.

    Since version 4, plane_index for the alpha plane is 1 in the case chroma_planes is 0.
    

    Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
    • [DH] libavcodec/ffv1dec.c

  • FFMPEG command works on terminal but not with Java/Kotlin

    11 septembre 2019, par Antony

    I’m trying to use an FFMPEG command for concatenating different videos. The command is

    ffmpeg -i video.mp4 -i video-2.mp4 -filter_complex "[0:v:0] [0:a:0] [1:v:0] [1:a:0] concat=n=2:v=1:a=1 [v] [a]" -map "[v]" -map "[a]" output.mp4

    This command works good when I run on Windows PowerShell. But when I try to run with Kotlin code it doesn’t work.

    val firstVideo = "D:\\Videos\\ffmpeg\\video.mp4"
    
val secondVideo = "D:\\Videos\\ffmpeg\\video-2.mp4"
    
val resultPath = "D:\\Videos\\ffmpeg\\result-2.mp4"
    

    
val cmd = "ffmpeg -i $firstVideo -i $secondVideo -filter_complex \"[0:v:0] [0:a:0] [1:v:0] [1:a:0] concat=n=2:v=1:a=1 [v] [a]\" -map \"[v]\" -map \"[a]\" $resultPath"
    
.split(" ").toTypedArray()
    

    
Runtime.getRuntime().exec(cmd)

    I’m not taking any error messages since I’m using FFMPEG cli.

    Also, this piece of Kotlin works perfect when I’m trying to run other FFMPEG operations.

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