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  • 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 (...)

  • Contribute to translation

    13 avril 2011

    You can help us to improve the language used in the software interface to make MediaSPIP more accessible and user-friendly. You can also translate the interface into any language that allows it to spread to new linguistic communities.
    To do this, we use the translation interface of SPIP where the all the language modules of MediaSPIP are available. Just subscribe to the mailing list and request further informantion on translation.
    MediaSPIP is currently available in French and English (...)

  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
    MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)

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  • How can I use ffmpeg's swscale to convert from NV12 to RGB32 ?

    28 août 2017, par Asik

    Say I have an NV12 frame in memory as an array of bytes. I know :

    • its Width and Height
    • its Stride (total width of a line including padding), which is the same for Y and UV components as per NV12 specification
    • I know where Y begins, U begins at Y + (Stride * Height), and V begins at U + 1 (interleaved with U).

    Now this is what I have so far :

    SwsContext* context = sws_getContext(frameWidth, frameHeight, AV_PIX_FMT_NV12, frameWidth, frameHeight, AV_PIX_FMT_RGB32, 0, nullptr, nullptr, nullptr);
    
sws_scale(context,

    So I don’t know what the parameters to sws_scale should be :

    • srcSlice : a pointer to the array of bytes ? It should apparently be a
      pointer to a pointer, but what I have is just a single-dimensional
      array of bytes.
    • srcStride : apparently expects an array of strides, but I have just one stride for the entire file. Should I pass an array with just
      one element ?
    • srcSliceY : an offset to the first byte I guess ? Should be 0 then.
    • srcSliceH : the frame height I guess
    • dst : once again, pointer to a pointer, but my destination output is actually just another array of bytes...
    • dstStride : Width * 4 I guess ?

    Any help appreciated.

  • ffmpeg - scrolling text with specified boundaries and cut video when text ends

    19 février 2017, par Elma Paul

    Having this working ffmpeg filter with overlayed scrolling text 

    f -i text_bg.mp4 -vf "drawtext=enable:fontsize=200:fontcolor=White:fontfile='ARIALN.TTF':text='asdfhlajsdh LKFJAHSDFH':x=-(mod(8*n\,w+tw)-tw):y=h/2-th/2" outtt.mp4 -y

    I have two questions :
    1.) How can I set specified boundaries for drawtext ? Just fix positions where the text will dissapear. Like here in picture
    scrolling text with specified boundaries example
    2.) How is it possible to cut the video(specify time) according to the text length.Meaning that the video will finish after ends the text line +plus one second ?

  • First image not showing image to video using ffmpeg

    3 octobre 2014, par death_relic0

    I am very new to ffmpeg and trying to convert a series of images to a video.

    The command I am using (copied/modified from a tutorial)

    ffmpeg -framerate 1/5 -start_number 1 -i dog%01d.jpg -c:v libx264 -r 30 -pix_fmt rgb24 dog.mp4

    Basically, I have 4 images labelled dog1.jpg, dog2.jpg, dog3.jpg and dog4.jpg.

    The problem is the output video I get has image starting at "dog2.jpg" and ending at "dog4.jpg" meaning that it is missing the first image in the sequence (i.e dog1.jpg).

    I tried with different image combinations and the same behavior happened, the resulting video never had the first image in the sequence.

    Any ideas ?

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