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FFmpegTest

An attempt to feed encoded Audio and Video data from Android's MediaCodec to FFmpeg to provide support for formats beyond Android's capabilities (Android's MediaMuxer is currently limited to .mp4). Our ultimate goal is to allow an Android device to act as an HLS server.

Included is a build of the ffmpeg 2.0.2 libraries for arm linux with debugging symbols enabled, and no optimizations.

Overview

Camera frames and Microphone samples are queued into instances of Android's MediaCodec, which performs the encoding in hardware. We poll MediaCodec after submitting each audio / video to dequeue encoded data and pass it to FFmpeg.

There are three JNI methods that bridge the tested Java/Android logic to FFmpeg. Their Java definitions are in FFmpegWrapper.java, and their C implementations in FFmpegWrapper.c.

  • prepareAVFormatContext(String outputPath);
    • Prepares an AVFormatContext for output, currently by reading from an mp4 prepared using Android's MediaMuxer and identical codec parameters.
  • writeAVPacketFromEncodedData(ByteBuffer jData, int jIsVideo, int jOffset, int jSize, int jFlags, long jPts);
    • Prepares an AVPacket from MediaCodec encoder output and submits it to FFmpeg via av_interleaved_write_frame(...), along with the AVFormatContext created with the first method.
  • finalizeAVFormatContext();
    • Finalizes our AVFormatContext with av_write_trailer(...)

Current Output

A video produced with the latest version of this application is available here.

Playing the output of this app in VLC results in generally correct audio and video.

ffprobe reports:

ffprobe version 1.2.4 Copyright (c) 2007-2013 the FFmpeg developers
  built on Oct  8 2013 17:01:58 with Apple LLVM version 4.2 (clang-425.0.28) (based on LLVM 3.2svn)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/1.2.4 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=cc --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
  libavutil      52. 18.100 / 52. 18.100
  libavcodec     54. 92.100 / 54. 92.100
  libavformat    54. 63.104 / 54. 63.104
  libavdevice    54.  3.103 / 54.  3.103
  libavfilter     3. 42.103 /  3. 42.103
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
[h264 @ 0x7ffb29018400] corrupted macroblock 11 29 (total_coeff=-1)
[h264 @ 0x7ffb29018400] error while decoding MB 11 29
[h264 @ 0x7ffb29018400] concealing 78 DC, 78 AC, 78 MV errors in I frame
Input #0, mpegts, from '/Users/davidbrodsky/Desktop/HWEncodingExperiments/ffmpeg/ffmpeg_1383766999385.mp4':
  Duration: 00:00:03.85, start: 0.000000, bitrate: 1214 kb/s
  Program 1 
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
    Stream #0:0[0x100]: Video: h264 (Baseline) ([27][0][0][0] / 0x001B), yuv420p, 640x480, 90k tbr, 90k tbn, 180k tbc
    Stream #0:1[0x101]: Audio: aac ([15][0][0][0] / 0x000F), 44100 Hz, mono, fltp, 137 kb/s

Building

To build, add a SECRETS.java file (see below) and import the project with Eclipse.

SECRETS.java

Add a SECRETS.java file to the project with the following format:

package com.example.ffmpegtest;

public class SECRETS {
	
	public static final String AWS_KEY = "YOUR_AWS_KEY";
	public static final String AWS_SECRET = "YOUR_AWS_SECRET";

}

If you don't have these handy, simply assign arbitrary values and change LiveHLSRecorder.UPLOAD_TO_S3 to false.

Debugging Native Components

In Eclipse with the NDK plugin.

  1. Import the project
  2. Follow the NDK plugin setup instructions
  3. Debug as Native Android Application

Manually:

$ cd ./jni
$ ndk-build NDK_DEBUG=1
# build and send the apk to device
$ cd ../  # The project root
$ ndk-gdb

License

Software License Agreement (GPLv3+)

Copyright (c) 2013, David Brodsky. All rights reserved.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

This software additionally references or incorporates the following sources of intellectual property, the license terms for which are set forth in the sources themselves:

FFmpeg - Used for muxing and processing of encoded data