Home/ Questions/Q 8104255
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-05T23:47:11+00:00

in my Android app, I observed that the video recorded from the front camera

  • 0

in my Android app, I observed that the video recorded from the front camera is being recorded with 7-10 fps while the back camera does the job fine, the native camera app does record video from front cam at 29fps.

I use the following function to set the frame rate

 myRecorder.setVideoFrameRate(30);

but somehow it records it at 8fps. what is the problem? Also the lighting conditions seem to improve it to 15fps, but I want it to be atleast >25fps how can I achieve this? Can we use NDK for this purpose?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    I’m exploring the same problem. Because the MediaRecorder already has a native implementation, using the NDK doesn’t seem to be a promising approach to increasing the frames per second. Improving the buffering with setPreviewCallbackWithBuffer as shown in the code at http://www.androidadb.com/source/cellbots-read-only/experimental/android/ioio/samples/ShootOnSight/src/com/cellbots/ioioshoot/CameraView.java.html seems promising but I first would like to get a better understanding of the many camera parameters and how they affect frame rate.

    As you surely know, there is a wide range of Android devices with a wide range of camera capabilities. To see the capabilities of your particular front and back cameras, you can use the following code (e.g., setting mCameraId to 0 for rear facing and to 1 for front facing).

        Camera mCamera = Camera.open(mCameraId);
    Camera.Parameters cp = mCamera.getParameters();
    Log.d(TAG, "camera parameters: " + cp.flatten());

    For example, here are the camera parameters dumped by my Nexus S (running OS 4.0.4).

    NEXUS-S FRONT FACING CAMERA PARAMETERS:
    06-16 15:14:16.909: D/SENSORS_PLUS(24583): camera parameters:
    picture-size-values=640×480;
    preview-fps-range=7500,30000;
    min-exposure-compensation=-4;
    vertical-view-angle=39.4;
    horizontal-view-angle=51.2;
    whitebalance=auto;
    jpeg-thumbnail-height=120;
    jpeg-quality=100;
    preview-format-values=yuv420sp,yuv420p;
    rotation=0;
    jpeg-thumbnail-quality=100;
    focus-mode=fixed;
    preview-format=yuv420sp;
    preview-size=640×480;
    focal-length=0.9;
    video-frame-format=yuv420p;
    picture-format-values=jpeg;
    max-exposure-compensation=4;
    exposure-compensation=0;
    preview-frame-rate-values=15;
    exposure-compensation-step=0.5;
    preview-frame-rate=15;
    effect-values=none,mono,negative,sepia;
    focus-mode-values=fixed;
    picture-size=640×480;
    effect=none;
    jpeg-thumbnail-width=160;
    whitebalance-values=auto,incandescent,fluorescent,daylight,cloudy-daylight;
    picture-format=jpeg;
    focus-distances=0.20,0.25,Infinity;
    preview-fps-range-values=(7500,30000);
    jpeg-thumbnail-size-values=160×120,0x0;
    preview-size-values=640×480,320×240,176×144

    NEXUS-S REAR FACING CAMERA PARAMETERS:
    06-16 15:46:55.315: D/SENSORS_PLUS(24732): camera parameters:
    picture-size-values=2560×1920,2048×1536,1600×1200,1280×960,640×480;
    preview-fps-range=15000,30000;
    min-exposure-compensation=-4;
    vertical-view-angle=39.4;
    horizontal-view-angle=51.2;
    whitebalance=auto;
    jpeg-thumbnail-height=240;
    scene-mode=auto;
    jpeg-quality=100;
    preview-format-values=yuv420sp,yuv420p;
    rotation=0;
    jpeg-thumbnail-quality=100;
    focus-mode=auto;
    preview-format=yuv420sp;
    preview-size=720×480;
    focal-length=3.43;
    video-frame-format=yuv420p;
    picture-format-values=jpeg;
    max-exposure-compensation=4;
    flash-mode-values=on,off,auto,torch;
    exposure-compensation=0;
    preview-frame-rate-values=30;
    exposure-compensation-step=0.5;
    preview-frame-rate=30;
    flash-mode=off;
    effect-values=none,mono,negative,sepia;
    focus-mode-values=auto,infinity,macro;
    picture-size=2560×1920;
    effect=none;
    jpeg-thumbnail-width=320;
    whitebalance-values=auto,incandescent,fluorescent,daylight,cloudy-daylight;
    scene-mode-values=auto,portrait,landscape,night,beach,snow,sunset,fireworks,sports,party,candlelight;
    picture-format=jpeg;
    focus-distances=0.10,1.20,Infinity;
    preview-fps-range-values=(15000,30000);
    jpeg-thumbnail-size-values=320×240,0x0;
    preview-size-values=720×480,640×480,352×288,176×144

    • 0