我遇到媒体多路复用器的问题。为什么我的应用程序崩溃？怎么解决？
java.lang.IllegalStateException: Failed to stop the muxer
at android.media.MediaMuxer.nativeStop(Native Method)
at android.media.MediaMuxer.stop(MediaMuxer.java:245)
at com.app.filter.helper.config.VideoInfoUtils.combineVideo(VideoInfoUtils.java:159)
at com.app.filter.helper.filter.video.VideoFilterView.handleSaveCompleted(VideoFilterView.java:74)
at com.app.filter.helper.filter.video.VideoFilterView$ViewHandler.handleMessage(VideoFilterView.java:167)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
我的Java代码是
public class VideoInfoUtils {
public static MediaFormat getVideoInfo(String path) {
MediaExtractor audioExtractor = new MediaExtractor();
try {
audioExtractor.setDataSource(path);
} catch (IOException e) {
e.printStackTrace();
}
int selectTrack = selectTrack(audioExtractor);
if (selectTrack < 0) {
throw new RuntimeException("No video track found in " + path);
}
MediaFormat format = audioExtractor.getTrackFormat(selectTrack);
return format;
}
/**
* Selects the video track, if any.
*
* @return the track index, or -1 if no video track is found.
*/
private static int selectTrack(MediaExtractor mMediaExtractor) {
// Select the first video track we find, ignore the rest.
int numTracks = mMediaExtractor.getTrackCount();
for (int i = 0; i < numTracks; i++) {
MediaFormat format = mMediaExtractor.getTrackFormat(i);
String mime = format.getString(MediaFormat.KEY_MIME);
if (mime.startsWith("video/")) {
return i;
}
}
return -1;
}
@SuppressLint("NewApi")
public static void combineVideo(String videoPath, String newVideo, String output) throws IllegalArgumentException {
try {
MediaExtractor videoExtractor = new MediaExtractor();
videoExtractor.setDataSource(newVideo);
MediaFormat videoFormat = null;
int videoTrackIndex = -1;
int videoTrackCount = videoExtractor.getTrackCount();
for (int i = 0; i < videoTrackCount; i++) {
videoFormat = videoExtractor.getTrackFormat(i);
String mimeType = videoFormat.getString(MediaFormat.KEY_MIME);
if (mimeType.startsWith("video/")) {
videoTrackIndex = i;
break;
}
}
MediaExtractor audioExtractor = new MediaExtractor();
audioExtractor.setDataSource(videoPath);
MediaFormat audioFormat = null;
int audioTrackIndex = -1;
int audioTrackCount = audioExtractor.getTrackCount();
for (int i = 0; i < audioTrackCount; i++) {
audioFormat = audioExtractor.getTrackFormat(i);
String mimeType = audioFormat.getString(MediaFormat.KEY_MIME);
if (mimeType.startsWith("audio/")) {
audioTrackIndex = i;
break;
}
}
videoExtractor.selectTrack(videoTrackIndex);
audioExtractor.selectTrack(audioTrackIndex);
MediaCodec.BufferInfo videoBufferInfo = new MediaCodec.BufferInfo();
MediaCodec.BufferInfo audioBufferInfo = new MediaCodec.BufferInfo();
MediaMuxer mediaMuxer;
int writeVideoTrackIndex;
int writeAudioTrackIndex;
try {
mediaMuxer = new MediaMuxer(output, MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);
writeVideoTrackIndex = mediaMuxer.addTrack(videoFormat);
writeAudioTrackIndex = mediaMuxer.addTrack(audioFormat);
mediaMuxer.start();
} catch (IOException ioe) {
throw new RuntimeException("MediaMuxer creation failed", ioe);
}
ByteBuffer byteBuffer = ByteBuffer.allocate(500 * 1024);
long videoStampTime = 0;
{
videoExtractor.readSampleData(byteBuffer, 0);
if (videoExtractor.getSampleFlags() == MediaExtractor.SAMPLE_FLAG_SYNC) {
videoExtractor.advance();
}
videoExtractor.readSampleData(byteBuffer, 0);
long secondTime = videoExtractor.getSampleTime();
videoExtractor.advance();
long thirdTime = videoExtractor.getSampleTime();
videoStampTime = Math.abs(thirdTime - secondTime);
}
videoExtractor.unselectTrack(videoTrackIndex);
videoExtractor.selectTrack(videoTrackIndex);
long audioStampTime = 0;
//获取帧之间的间隔时间
{
audioExtractor.readSampleData(byteBuffer, 0);
if (audioExtractor.getSampleFlags() == MediaExtractor.SAMPLE_FLAG_SYNC) {
audioExtractor.advance();
}
audioExtractor.readSampleData(byteBuffer, 0);
long secondTime = audioExtractor.getSampleTime();
audioExtractor.advance();
audioExtractor.readSampleData(byteBuffer, 0);
long thirdTime = audioExtractor.getSampleTime();
audioStampTime = Math.abs(thirdTime - secondTime);
Log.e("time", audioStampTime + "");
}
audioExtractor.unselectTrack(audioTrackIndex);
audioExtractor.selectTrack(audioTrackIndex);
while (true) {
int readVideoSampleSize = videoExtractor.readSampleData(byteBuffer, 0);
if (readVideoSampleSize < 0) {
break;
}
videoBufferInfo.size = readVideoSampleSize;
videoBufferInfo.presentationTimeUs += videoStampTime;
videoBufferInfo.offset = 0;
videoBufferInfo.flags = videoExtractor.getSampleFlags();
mediaMuxer.writeSampleData(writeVideoTrackIndex, byteBuffer, videoBufferInfo);
videoExtractor.advance();
}
while (true) {
int readAudioSampleSize = audioExtractor.readSampleData(byteBuffer, 0);
if (readAudioSampleSize < 0) {
break;
}
audioBufferInfo.size = readAudioSampleSize;
audioBufferInfo.presentationTimeUs += audioStampTime;
audioBufferInfo.offset = 0;
audioBufferInfo.flags = videoExtractor.getSampleFlags();
mediaMuxer.writeSampleData(writeAudioTrackIndex, byteBuffer, audioBufferInfo);
audioExtractor.advance();
}
if (mediaMuxer != null) {
mediaMuxer.stop();
mediaMuxer.release();
}
videoExtractor.release();
audioExtractor.release();
} catch (IOException e) {
e.printStackTrace();
}
}
}
在我的应用程序中，我试图在视频上添加过滤器。 但是有时候我的应用程序崩溃了，有时候效果很好。 错误是“无法停止多路复用器”
答案 0 :(得分：0)
// Throws exception b/c start() is not called.
muxer = new MediaMuxer(outputFile, MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);
muxer.addTrack(MediaFormat.createVideoFormat("video/avc", 480, 320));
try {
muxer.stop();
fail("should throw IllegalStateException.");
} catch (IllegalStateException e) {
// expected
}
为此，您需要确保在停止互斥之前声明了互斥。您可以保持isMutextStarted之类的变量来存储状态。但这只是黑客。
我建议您仅在接下来开始的多路复用器上启动它。否则，将其保留为null，则您的mediaMuxer.stop（）和发布部件将不会执行。