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361

answers:

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I am currently writing an application that read frames from camera, modify them, and save them into a video file. I'm planing to do it with ffmpeg. There's rarely a documentation about ffmpeg. I can't find a way. Does any know how to do it?

I need it to be done on unix, and in C or C++. Does any can provide some instructions?

Thanks.

EDIT:

Sorry, I haven't write clearly. I want some developer APIs to write frames to a video file. I open up camera stream, I get every single frame, then I save them into a video file with those APIs available in ffmpeg's public apis. So using command line tool actually doesn't help me. And I've seen output_example.c under the ffmpeg src folder. It's pretty great that I may copy some parts of the code directly without change. And I am still looking for a easier way.

Also, I'm thinking of porting my app to iPhone, as far as I know, only ffmpeg has been ported on iPhone. GStreamer is based on glib, and it's all GNU stuff. I'm not sure if I can get it work on iPhone. So ffmpeg is still the best choice for now.

Any comments is appreciated.

A: 

If other solutions than ffmpeg are feasible for you, you might want to look at GStreamer. I think it might be just the right thing for your case, and there's quite some documentation out there.

balpha
+1  A: 

This might help get you started - the documentation is available, but newer features tend to be documented in ffmpeg's man pages.

The frames need to be numbered sequentially.

ffmpeg -f image2 -r 25 -i frame_%d.jpg -vcodec libx264 -vpre hq -crf 22 video.mp4
  • -f defines the format
  • -r defines the frame rate
  • -i defines the input file/s ... %d specifies numbered files .. add 0's to specify padding
  • -vcodec selects the video codec
  • -vpre specifies use of a preset called hq
  • -crf specifies a rate control method, used to define how the x264 stream is encoded
  • video.mp4 is the output file
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