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• How to encode a stream of RGBA values to video ?

  20 septembre 2011, par Rob Oplawar

  More specifically :
  I have a sequence of 32 bit unsigned RGBA integers for pixels- e.g. 640 integers per row starting at the left pixel, 480 rows per frame starting at the top row, repeat for n frames. Is there an easy way to feed this to ffmpeg (or some other encoder) without first encoding it to a common image format ?

  I'm assuming ffmpeg is the best tool for me to use in this case, but I'm open to suggestions (the output video format doesn't matter too much).

  ---

  I know the documentation would enlighten me if I just knew the right keywords... In case I'm asking the wrong question, here's what I'm trying to do at the highest level :

  I have some Actionscript code that draws and animates on the display tree, and I've wrapped it in an AIR application that draws BitmapData frame-by-frame. AIR has proved to be woefully inefficient at directly encoding this output- the best I've managed is a few frames per second, and I need to render at least 15 fps, preferably more like 100 fps, which I get out of ffmpeg when I feed it PNG images (AIR can take 1+ seconds to encode one 640x480 png... appalling). Instead of encoding inside AIR I can send the raw byte data out to an encoder or to disk as fast as it's rendered.

  If you're wondering why I'm using Actionscript to render an animation or why it has to be encoded quickly, don't. Suffice it to say, the frames are computed at execution time (not stored as an animation in a .swf file, for example), I have a very large amount of video to create and limited time to do so, and using something other than Actionscript to produce the frames is not an option.

• Playing m3u8 on Android Froyo using FFmpeg

  8 février 2012, par user1184526

  I need to create an http live streaming client in Android froyo without being dependent on 3rd party applications (e.g Vitamio). I am able to configure and build Bambuser's release of FFmpeg using Android ndk r7. My problem is I don't know how to use it.

  I found sample codes here in stackoverflow and other forums where people are able to play .avi/.mp3 files from a url using av_open_input_file(). My question is, is it the same for m3u8 files ? Or, do i need to use other functions to be able to work around them ? I don't know how to begin.

  Note : I am an android developer. My C programming is a little bit weak.

• how to convert and capture with ffmpeg

  16 février 2012, par Wai Yan

  I want to upload a video.Uploaded video will be capture two images at 10% and 50% time length.
  And if uploaded video is not flv, want to convert to flv.
  How to know uploaded video is flv or not flv.
  How to convert ?
  Now I am using php and ffmpeg.
  Please someone answer me.I am beginner for php, ffmpeg and english language.
  I founded many questions in this website about ffmpeg.But I can't found need answer.
  If this question is duplicate question,forgive me.