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i am searching for a way to create a video from a row of frames i have rendered with OpenGL and transfered to ram as int array using the glGetTexImage function. is it possible to achieve this directly in ram (~10 secs video) or do i have to save each frame to the harddisk and encode the video afterwards?
i have found this sample http://cekirdek.pardus.org.tr/~ismail/ffmpeg-docs/api-example_8c-source.html in an other SO question but is this still the best way to do it?
today i got a hint to use this example http://git.videolan.org/?p=ffmpeg.git;a=blob;f=doc/examples/decoding_encoding.c;h=cb63294b142f007cf78436c5d81c08a49f3124be;hb=HEAD to see how h264 could be achieved. the problem when you want to encode frames rendered by opengl is that they are in RGB(A) and most codecs require YUV. for the convertion you can use swscale (ffmpeg) – an example how to use it can be found here http://web.me.com/dhoerl/Home/Tech_Blog/Entries/2009/1/22_Revised_avcodec_sample.c.html
as ananthonline stated the direct encoding of the frames is very cpu intensive but you can also write your frames with ffmpeg as rawvideo format, which supports the rgb24 pixelformat, and convert it offline with the cmd commands of ffmpeg.