我正在开发一款Android应用程序，其中包含mp3音频文件和(mp4无声)视频文件。
现在我想将它们混合并创建一个新的带有声音的mp4视频文件。从Android 4.3开始，Google建议使用MediaMuxer类来混合流式音频和视频。我已经尝试了很多次但没有成功。
以下是代码：
private void muxing() {
String outputFile = "";
try {
File file = new File(Environment.getExternalStorageDirectory() + "/final2.mp4");
file.createNewFile();
outputFile = file.getAbsolutePath();
MediaExtractor videoExtractor = new MediaExtractor();
videoExtractor.setDataSource(Environment.getExternalStorageDirectory().toString()+"/vd1.h264");
MediaExtractor audioExtractor = new MediaExtractor();
audioExtractor.setDataSource(Environment.getExternalStorageDirectory()+"/audioVideoDir/audio.m4a");
MediaMuxer muxer = new MediaMuxer(outputFile, MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);
videoExtractor.selectTrack(0);
MediaFormat videoFormat = videoExtractor.getTrackFormat(0);
int videoTrack = muxer.addTrack(videoFormat);
audioExtractor.selectTrack(0);
MediaFormat audioFormat = audioExtractor.getTrackFormat(0);
int audioTrack = muxer.addTrack(audioFormat);
boolean sawEOS = false;
int frameCount = 0;
int offset = 100;
int sampleSize = 256 * 1024;
ByteBuffer videoBuf = ByteBuffer.allocate(sampleSize);
ByteBuffer audioBuf = ByteBuffer.allocate(sampleSize);
MediaCodec.BufferInfo videoBufferInfo = new MediaCodec.BufferInfo();
MediaCodec.BufferInfo audioBufferInfo = new MediaCodec.BufferInfo();
videoExtractor.seekTo(0, MediaExtractor.SEEK_TO_CLOSEST_SYNC);
audioExtractor.seekTo(0, MediaExtractor.SEEK_TO_CLOSEST_SYNC);
muxer.start();
while (!sawEOS)
{
videoBufferInfo.offset = offset;
videoBufferInfo.size = videoExtractor.readSampleData(videoBuf, offset);
if (videoBufferInfo.size < 0 || audioBufferInfo.size < 0)
{
// Log.d(TAG, "saw input EOS.");
sawEOS = true;
videoBufferInfo.size = 0;
}
else
{
videoBufferInfo.presentationTimeUs = videoExtractor.getSampleTime();
videoBufferInfo.flags = videoExtractor.getSampleFlags();
muxer.writeSampleData(videoTrack, videoBuf, videoBufferInfo);
videoExtractor.advance();
frameCount++;
}
}
Toast.makeText(getApplicationContext() , "frame:" + frameCount , Toast.LENGTH_SHORT).show();
boolean sawEOS2 = false;
int frameCount2 =0;
while (!sawEOS2)
{
frameCount2++;
audioBufferInfo.offset = offset;
audioBufferInfo.size = audioExtractor.readSampleData(audioBuf, offset);
if (videoBufferInfo.size < 0 || audioBufferInfo.size < 0)
{
// Log.d(TAG, "saw input EOS.");
sawEOS2 = true;
audioBufferInfo.size = 0;
}
else
{
audioBufferInfo.presentationTimeUs = audioExtractor.getSampleTime();
audioBufferInfo.flags = audioExtractor.getSampleFlags();
muxer.writeSampleData(audioTrack, audioBuf, audioBufferInfo);
audioExtractor.advance();
}
}
Toast.makeText(getApplicationContext() , "frame:" + frameCount2 , Toast.LENGTH_SHORT).show();
muxer.stop();
muxer.release();
} catch (IOException e) {
} catch (Exception e) {
}
}
我遇到以下错误：
未知的媒体类型 'audio/mpeg'。12-09 11:58:33.569：A/MPEG4Writer(332)：frameworks/av/media/libstagefright/MPEG4Writer.cpp:2699 CHECK(!"should not be here, unknown mime type.")
有没有什么解决方法来解决我在使用谷歌的MediaMuxer API时遇到的问题？即使我尝试使用FFmpeg将音频和视频合并在一起，视频也无法在Android设备的默认视频播放器中播放，但可以在VLC播放器中加载。
从此处开始使用FFmpeg：https://github.com/WritingMinds/ffmpeg-android-java