I have yet to see a working example from anyone using MediaCodec. I hope I
am wrong, but I think there's a reason why there are no working samples.
All I've seen from Google is a powerpoint slide presentation by the head
developer. No actual working code.
On Thursday, December 13, 2012 9:57:16 AM UTC-5, Peter Kolarov wrote:
>
> Hello,
>
> I am using Samsung N7100 device to test encoding capabilities of
> mediacodec API, and I am not able to get any meaningful results. Basically,
> I am able to successfully setup encoder, then I am able to enqueu input
> buffers, I am also getting 2 output buffers worth of data before the
> encoder gets stuck and no output buffer gets dequeued anymore, causing
> input buffers to fail to enqueuing further data. I tried 3 supported device
> codecs (avc, 3gpp, mp4v-es) all with similar results.
>
> Here is how I setup:
>
> codec = MediaCodec.createEncoderByType("video/avc");
>> MediaFormat format = MediaFormat.createVideoFormat("video/avc", WIDTH,
>> HEIGHT);
>> format.setInteger(MediaFormat.KEY_BIT_RATE, 5000000);
>> format.setFloat(MediaFormat.KEY_FRAME_RATE, (float)7.5);
>> format.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, 1);
>> format.setInteger(MediaFormat.KEY_COLOR_FORMAT,
>> MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420Planar );
>> codec.configure(format, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);
>> codec.start();
>
>
> Then I feed the encoder:
>
> int inputBufferIndex = codec.dequeueInputBuffer(TIMEOUT);
>> if (inputBufferIndex >= 0) {
>> convertRGBtoYUV420EncoderInput(rgbData, WIDTH, HEIGHT,
>> codecInputBuffers[inputBufferIndex]);
>> codec.queueInputBuffer(inputBufferIndex, 0,
>> codecInputBuffers[inputBufferIndex].capacity(), 0, 0);
>> }
>> else{
>> myLog.i("Cannot yet enque more data #:" + inputBufferIndex);
>> }
>>
>
>
> And I get output data like so:
>
> info = new MediaCodec.BufferInfo();
>> int outputBufferIndex = codec.dequeueOutputBuffer(info, TIMEOUT);
>> if (outputBufferIndex >= 0) {
>> byte[] dst = new byte[info.size];
>> codecOutputBuffers[outputBufferIndex].get(dst, 0, info.size);
>>
>> codec.releaseOutputBuffer(outputBufferIndex, false);
>
> }
>
>
>
> When I set TIMEOUT to -1 the call to codec.dequeueOutputBuffer never
> returns after getting 2 output buffers worth of data (basically just AVC
> header). Also BufferInfo has only 0s and no usefull information, thus I
> dont get really any errors but buffers dont work. Is there anything else
> that needs to get setup e.g. filling input buffer with some further codec
> config before I start feeding it real YUV video data???
> Any help or working sample would be highly apreciated...
>
> Thanks,
>
>
> -peter
>
>
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