我有一个从麦克风录制的3gp文件和一个mp4视频文件。
我想将音频文件和视频文件混合成一个mp4文件并保存。
我搜索了很多但没有找到任何有用的使用Android的MediaMuxer API的资料。
MediaMuxer api
更新：这是我的方法，用于混合两个文件，但我在其中遇到了异常。
原因是目标mp4文件没有任何轨道！
有人可以帮我添加音频和视频轨道到混合器中吗？
异常信息：
更新2：问题已解决！请查看我的问题答案。
感谢您的帮助。
异常信息：
java.lang.IllegalStateException: Failed to stop the muxer
我的代码：
private void cloneMediaUsingMuxer( String dstMediaPath) throws IOException {
// Set up MediaExtractor to read from the source.
MediaExtractor soundExtractor = new MediaExtractor();
soundExtractor.setDataSource(audioFilePath);
MediaExtractor videoExtractor = new MediaExtractor();
AssetFileDescriptor afd2 = getAssets().openFd("Produce.MP4");
videoExtractor.setDataSource(afd2.getFileDescriptor() , afd2.getStartOffset(),afd2.getLength());
//PATH
//extractor.setDataSource();
int trackCount = soundExtractor.getTrackCount();
int trackCount2 = soundExtractor.getTrackCount();
//assertEquals("wrong number of tracks", expectedTrackCount, trackCount);
// Set up MediaMuxer for the destination.
MediaMuxer muxer;
muxer = new MediaMuxer(dstMediaPath, MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);
// Set up the tracks.
HashMap<Integer, Integer> indexMap = new HashMap<Integer, Integer>(trackCount);
for (int i = 0; i < trackCount; i++) {
soundExtractor.selectTrack(i);
MediaFormat SoundFormat = soundExtractor.getTrackFormat(i);
int dstIndex = muxer.addTrack(SoundFormat);
indexMap.put(i, dstIndex);
}
HashMap<Integer, Integer> indexMap2 = new HashMap<Integer, Integer>(trackCount2);
for (int i = 0; i < trackCount2; i++) {
videoExtractor.selectTrack(i);
MediaFormat videoFormat = videoExtractor.getTrackFormat(i);
int dstIndex2 = muxer.addTrack(videoFormat);
indexMap.put(i, dstIndex2);
}
// Copy the samples from MediaExtractor to MediaMuxer.
boolean sawEOS = false;
int bufferSize = MAX_SAMPLE_SIZE;
int frameCount = 0;
int offset = 100;
ByteBuffer dstBuf = ByteBuffer.allocate(bufferSize);
MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();
MediaCodec.BufferInfo bufferInfo2 = new MediaCodec.BufferInfo();
muxer.start();
while (!sawEOS) {
bufferInfo.offset = offset;
bufferInfo.size = soundExtractor.readSampleData(dstBuf, offset);
bufferInfo2.offset = offset;
bufferInfo2.size = videoExtractor.readSampleData(dstBuf, offset);
if (bufferInfo.size < 0) {
sawEOS = true;
bufferInfo.size = 0;
bufferInfo2.size = 0;
}else if(bufferInfo2.size < 0){
sawEOS = true;
bufferInfo.size = 0;
bufferInfo2.size = 0;
}
else {
bufferInfo.presentationTimeUs = soundExtractor.getSampleTime();
bufferInfo2.presentationTimeUs = videoExtractor.getSampleTime();
//bufferInfo.flags = extractor.getSampleFlags();
int trackIndex = soundExtractor.getSampleTrackIndex();
int trackIndex2 = videoExtractor.getSampleTrackIndex();
muxer.writeSampleData(indexMap.get(trackIndex), dstBuf,
bufferInfo);
soundExtractor.advance();
videoExtractor.advance();
frameCount++;
}
}
Toast.makeText(getApplicationContext(),"f:"+frameCount,Toast.LENGTH_SHORT).show();
muxer.stop();
muxer.release();
}
更新2：问题已解决！请查看我的问题答案。
感谢您的帮助。