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Sur d’autres sites (9570)

  • Encoding SWF to video with Melt

    17 août 2015, par RocketR

    I’m doing a project which requires converting SWF movies to H.264 video on server-side, to be able to play them both in Flash player and on iPhone/iPad. And I really got stuck.

    I’m using Melt from http://www.mltframework.org/ and this is my command-line :

    melt movie.swf -consumer avformat:video.mp4 r=30 s=640x360 f=mp4 acodec=aac ab=128k ar=48000 vcodec=libx264 b=1000k an=1

    It does play in Flash player, but fails to play on iDevices. I googled for iPhone video requirements and it seems my video files do satisfy them(frame size, framerate and bitrate). What settings should I change to make it play ?

  • OpenGL ES glReadPixels exc_bad_access

    6 décembre 2011, par Yanny

    I'm trying to create video from images using OpenGL ES and ffmpeg, but on iPad(4.3) I have a crash on glReadPixels

    -(NSData *) glToUIImage {
    

    
    int numberOfComponents = NUMBER_OF_COMPONENTS; //4
    
    int width = PICTURE_WIDTH; 
    
    int height = PICTURE_HEIGHT;
    

    
    NSInteger myDataLength = width * height * numberOfComponents;   
    

    
    NSMutableData * buffer= [NSMutableData dataWithLength :myDataLength];    
    

    
    [self checkForGLError]; 
    

    
    GLenum type = NUMBER_OF_COMPONENTS == 3 ? GL_RGB : GL_RGBA; //RGBA
    
    glReadPixels(0, 0, width, height, type, GL_UNSIGNED_BYTE, [buffer mutableBytes]);   //EXC_BAD_ACCESS here
    

    
    return buffer; 
    
}

    It is working on iPhone 4 (4.3) and iPod Touch, but have problems on iPhone 3G(3.0) and iPad(4.3). Can you help me with this issue ?

    Also on iPhone 3G(3.0) and iPad(4.3) I have problems with Video - first 5-20 video frames have trash. Maybe issue with optimization ? Or architecture ?

    EDITED
    Stack :

    #0  0x33be3964 in void BlockNxN<64ul, 16ul, 1, BLOCK_CONVERTER_NULL_32>(unsigned long, int, int, unsigned long, int, int, unsigned int, unsigned int, unsigned int, unsigned int) ()
    
#1  0x33be1c76 in glrBIFDetile ()
    
#2  0x33b586b2 in sgxGetImage(SGXImageReadParams const*) ()
    
#3  0x33b50d38 in gldReadPixels ()
    
#4  0x31813e16 in glReadPixels_Exec ()
    
#5  0x31e3c518 in glReadPixels ()

  • Multi bitrate live HLS with FFmpeg on Windows

    16 mai 2014, par Nioreh

    I am trying to encode a live stream into Apple HLS for iPhone on windows. I was looking at different options and wowza can do it, but doesn’t support CDN distribution of HLS as far as I can see. Plus it costs a lot of money.

    What I did find was this site : http://www.espend.de/artikel/iphone-ipad-ipod-http-streaming-segmenter-and-m3u8-windows.html

    I can now set up a single bitrate stream easily, but my goal is an adapive multi-bitrate live stream. Is it possible ? For VOD content it can easily be accomplished with creating the different qualities then linking to them in a new m3u8, but how would this be done in live ?

    I can of course set up three quality live streams and link to them in an m3u8, but how will I get them GOP-aligned in this case ?

    My initial thought was to have one ffmpeg instance create all qualities and re-stream those outputs to new ffmpeg-instances that just remux and pipe to the segmenter. But I would need some way of streaming locally between instances. Can that be done ?

    If anyone has a nice solution to this, or can link to other software capable of live HLS on windows, I would appreciate any input.

    Have a great day !
    Regards
    Carl

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