android-4.3-jelly-beanandroid-mediacodecmuxer

Media Codec API with Input as Surface not working with H264 encoder (bigflake example code)

I am trying to run the example code of Media Codec API with H264 Encoder on 4.3 explained in following link of bigflake

http://bigflake.com/mediacodec/CameraToMpegTest.java.txt

I have faced following problem. -> In H264 encoder code the color format,height and width are not getting updated because there is problem in getpatameter implemetation. So i applied this patch (https://code.google.com/p/android/issues/detail?id=58834). -> After applying the patch,also encoder does not encode -> I have seen the observation like D/CameraToMpegTest( 3421): encoder output format changed: {csd-1=java.nio.ByteArrayBuffer[position=0,limit=8,capacity=8], height=144, mime=video/avc, csd-0=java.nio.ByteArrayBuffer[position=0,limit=12,capacity=12], what=1869968451, width=176}

SO why this value is getting changed, No idea... After that we always see encoder gives status of queueOutputBuffer as INFO_TRY_AGAIN_LATER. So it creates the file but it does not encode anything and it stops as

I/MPEG4Writer( 3421): Received total/0-length (0/0) buffers and encoded 0 frames. - video

D/MPEG4Writer( 3421): Stopping Video track

D/MPEG4Writer( 3421): Stopping Video track source

D/MPEG4Writer( 3421): Video track stopped

D/MPEG4Writer( 3421): Stopping writer thread

D/MPEG4Writer( 3421): 0 chunks are written in the last batch

D/MPEG4Writer( 3421): Writer thread stopped

So in my understanding it should work but looks like still encoder is not getting configured properly...

Please guide on this... Thanks

Nehal

Solution

  • I have tried running CameraToMpegTest sample on Android 4.3 emulator. As you'd have realized by now, it's not going to work as it is, and some fixes are required.

    1. Implement getparameter properly in SoftAVCEncoder (in case of MIME type - "video/avc") for parameters like width, height, colour format. Otherwise your MediaFormat is not configured properly, and createInputSurface would fail. (I am not sure why this doesn't cause any problem when running H.264 encoding using Mediarecorder)

    2. Fix the EGL attributes

    3. Most importantly, if you're trying to execute this code in Activity context, make sure you don't block onFrameAvailable callback (final void join() Blocks the current Thread (Thread.currentThread()) until the receiver finishes its execution and dies.)