KEY_FRAME_RATE is being ignored in Android

Question

I am using MediaCodec to encode video from the camera into h264. I used to have 30 fps and this is the output I was getting, but now I need to switch to 25fps and the MediaFormat line:

    format.setInteger(MediaFormat.KEY_FRAME_RATE, FRAME_RATE);

is not working: I always get 30fps regardless of this value (I even tried putting 5 fps and the video is still smooth).

Is there anything else I need to do to achieve my desired fps value?

score 1 · Answer 1 · edited May 23 '17 at 12:02

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MediaFormat.KEY_FRAME_RATE does not tell the Encoder to drop frames. Visit for more information .

To reduce the overall framerate you have to either drop frames manually, correct the timestamps to match your desired fps (probably not what since the result will be a longer video)

A very basic but good doc on how to manipulate framerates (sadly mostly increasing the rate) can be found here

Greetings

edited May 23 '17 at 12:02

Community

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answered Apr 06 '17 at 13:29

ChrisBe

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@MichelReap You can correct the timestamps as the frames are fed into the MediaMuxer through writeSampleData(). – Grant Apr 06 '17 at 15:58
wouldnt this make the video choppy? – MichelReap Apr 13 '17 at 11:19

KEY_FRAME_RATE is being ignored in Android

1 Answers1