reduce encoder frame rate

Question

I am tying to limit the frame rate to 5-10 fps. The encoded frame are being sent though web-socket connection and my goal is to limit bandwidth to 1Mbps while having good quality for larger resolution.

my current attempt is:

    val format =
            MediaFormat.createVideoFormat(MediaFormat.MIMETYPE_VIDEO_VP8, size.width, size.height)
        format.setInteger(MediaFormat.KEY_COLOR_FORMAT,
            MediaCodecInfo.CodecCapabilities.COLOR_FormatSurface);
        format.setInteger(MediaFormat.KEY_BIT_RATE, 1000000);
        format.setInteger(MediaFormat.KEY_BITRATE_MODE,  MediaCodecInfo.EncoderCapabilities.BITRATE_MODE_CBR_FD);
        format.setInteger(MediaFormat.KEY_FRAME_RATE, 1);
        format.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, 5);
        format.setInteger(MediaFormat.KEY_MAX_FPS_TO_ENCODER, 1);
encoderInput = mEncoder!!.createInputSurface()
encoderInput.setFrameRate(1f,Surface.FRAME_RATE_COMPATIBILITY_FIXED_SOURCE,Surface.CHANGE_FRAME_RATE_ALWAYS)

I tired both setting the frame rate in the format and on the surface but it is still not limiting it. based on this discussion MediaCodec KEY_FRAME_RATE seems to be ignored

The bandwidth does follow the bit rate set in the format but not he frame rate so the quality is bad.

so how to reduce the frame rate ? preferably in a way that support older version of android.

reduce encoder frame rate

0 Answers0