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Is it possible to limit fps range in android camera.. tried to change the values in .setPreviewFpsRange()... but frame rate are not changed.. it comes continuously 30 frames per second

Binu
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2 Answers2

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You can use public List<int[]> getSupportedPreviewFpsRange () to check what FPS range supported by your device. Here is mine:

preview-fps-range-values=(10000,10000),(15000,15000),(15000,30000),(30000,30000);

so if I want to change the fps to 15, I can setPreviewFpsRange(15000,15000).

yushulx
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  • this worked.. But if only one fps range is available then how to do... any way to restricting call back to avoid more frame rates – Binu Mar 18 '14 at 08:23
  • sure. Based on your strategy, you can do anything in preview callback function to programmatically change the FPS. For example, you can drop frames, or sleep thread for a couple of milliseconds. – yushulx Mar 18 '14 at 09:51
  • used thred.sleep.. but it blocks other thread.. can u give some example for drop frames to do this.. – Binu Mar 18 '14 at 10:48
  • How did you sleep your thread? You should use it in onPreviewFrame(byte[] data, Camera camera), in which you can also deal with all preview frames. – yushulx Mar 19 '14 at 02:29
  • @yushulx can you please take a look on this question : http://stackoverflow.com/questions/30564273/how-to-get-camera-preview-frame-after-every-500ms – sam_k Jun 03 '15 at 15:09
  • **Thread.sleep()** in **onPreviewFrame()** is dangerous, but even worse if this callback comes on the UI thread. You must [open the camera on a separate HandlerThread](https://stackoverflow.com/a/19154438/192373) so that the camera callbacks use that background thread and not the UI thread. – Alex Cohn Sep 26 '17 at 10:30
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I set the preview frame rate to the lowest rate possible with this code, but you could set it to the highest rate possible by using l_last instead of l_first in the List index (mCamera is a member variable that references the Camera and is set elsewhere in the code).

Camera.Parameters l_params = mCamera.getParameters();

List<int[]> frameRates = l_params.getSupportedPreviewFpsRange();
int l_first = 0;
int l_last = frameRates.size() - 1;
int minFps = (frameRates.get(l_first))[Camera.Parameters.PREVIEW_FPS_MIN_INDEX];
int maxFps = (frameRates.get(l_first))[Camera.Parameters.PREVIEW_FPS_MAX_INDEX];
l_params.setPreviewFpsRange(minFps, maxFps);

mCamera.setParameters(l_params);
Simon Hänisch
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BurningThumb
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  • Camera.Parameters has been deprecated in Android L – Beeing Jk Jul 02 '18 at 10:39
  • I think it should be l_last instead of l_first in the sixth line: "int maxFps = (frameRates.get(l_last))[Camera.Parameters.PREVIEW_FPS_MAX_INDEX];" – kfir Jan 03 '21 at 13:53