Question

我正在录制音频，然后尝试合并aac音频和mp4视频文件（静音，没有音频），并共享合并的mp4文件。合并的mp4文件的共享适用于三星J2和小米，但mp4文件不能在联想，Micromax和其他手机中播放。测试结果如下： https://docs.google.com/spreadsheets/d/1eeJEM-v-smEUzY-bSxwIwFVOsAbv6KT2u3Kz3jdOb8o/edit?usp=sharing 我无法理解问题是由于共享或由于不正确的多路复用以及问题的原因造成的。请帮忙。

共享代码存在于recordAudio.java中，并且是：

public void shareVroom(View view) {
//    Toast.makeText(this, "Share feature is temporarily disabled", android.widget.Toast.LENGTH_LONG).show();

//    Toast.makeText(this, "Share feature is enabled", android.widget.Toast.LENGTH_LONG).show();
        // Code commented for UAT

        try {
            MediaMultiplexer mediaMultiplexer = new MediaMultiplexer();
            mediaMultiplexer.startMuxing(this);

            Toast.makeText(this, "in share",Toast.LENGTH_SHORT).show();
            String shareableFileName = "";

            Intent intentShareFile = new Intent(Intent.ACTION_SEND);
            shareableFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
            shareableFileName += getString(R.string.vroom_video_output_file_name);
            File fileWithinMyDir = new File(shareableFileName);
            Uri videoUri=Uri.parse(shareableFileName);
            if (fileWithinMyDir.exists()) {
                intentShareFile.setType("video/mp4");
                intentShareFile.putExtra(Intent.EXTRA_STREAM, videoUri);
                intentShareFile.putExtra(Intent.EXTRA_SUBJECT, "Listen to my VROOM");
                intentShareFile.putExtra(Intent.EXTRA_TEXT, "Vroom attached");
                startActivity(Intent.createChooser(intentShareFile, "Share your Vroom with"));
            }

        } catch (IllegalStateException e) {
            e.printStackTrace();
            Log.e("tag", e.getMessage(), e);
            Toast.makeText(this, "could not shared"+e.getMessage(),Toast.LENGTH_SHORT).show();
        }


        //TODO:Use event to identify if muxing is done

    }

多路复用代码：

public class MediaMultiplexer {
    private static final int MAX_SAMPLE_SIZE = 256 * 1024;

    public void startMuxing(Context context) {
        MediaMuxer muxer = null;
        MediaFormat VideoFormat = null;
        Resources mResources = context.getResources();
        int sourceVideo = R.raw.vid;
        String outputVideoFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
        outputVideoFileName += context.getString(R.string.vroom_video_output_file_name);
        try {
            muxer = new MediaMuxer(outputVideoFileName, MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);
        } catch (IOException e) {
            e.printStackTrace();
        }
        MediaExtractor extractorVideo = new MediaExtractor();
        try {
            AssetFileDescriptor srcVideoFd = mResources.openRawResourceFd(sourceVideo);
            extractorVideo.setDataSource(srcVideoFd.getFileDescriptor(), srcVideoFd.getStartOffset(), srcVideoFd.getLength());
            int tracks = extractorVideo.getTrackCount();
            for (int i = 0; i < tracks; i++) {
                MediaFormat mf = extractorVideo.getTrackFormat(i);
                String mime = mf.getString(MediaFormat.KEY_MIME);
                if (mime.startsWith("video/")) {
                    extractorVideo.selectTrack(i);
                    VideoFormat = extractorVideo.getTrackFormat(i);
                    break;
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

        MediaExtractor extractorAudio = new MediaExtractor();
        try {
            String audioFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
            audioFileName += context.getString(R.string.vroom_audio_file_name);
            extractorAudio.setDataSource(audioFileName);
            int tracks = extractorAudio.getTrackCount();
//            Toast.makeText(context, "No of tracks::::" + String.valueOf(tracks), Toast.LENGTH_SHORT).show();
            extractorAudio.selectTrack(0);

            MediaFormat AudioFormat = extractorAudio.getTrackFormat(0);
            int audioTrackIndex = muxer.addTrack(AudioFormat);
            int videoTrackIndex = muxer.addTrack(VideoFormat);

            boolean sawEOS = false;
            boolean sawAudioEOS = false;
            int bufferSize = MAX_SAMPLE_SIZE;
            ByteBuffer dstBuf = ByteBuffer.allocate(bufferSize);
            int offset = 100;
            MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();
            muxer.start();

            while (!sawEOS) {
                bufferInfo.offset = offset;
                bufferInfo.size = extractorVideo.readSampleData(dstBuf, offset);
                if (bufferInfo.size < 0) {
                    sawEOS = true;
                    bufferInfo.size = 0;
                } else {
                    bufferInfo.presentationTimeUs = extractorVideo.getSampleTime();
                    bufferInfo.flags = extractorVideo.getSampleFlags();
                    int trackIndex = extractorVideo.getSampleTrackIndex();
                    muxer.writeSampleData(videoTrackIndex, dstBuf, bufferInfo);
                    extractorVideo.advance();
                }
            }
            ByteBuffer audioBuf = ByteBuffer.allocate(bufferSize);
            while (!sawAudioEOS) {
                bufferInfo.offset = offset;
                bufferInfo.size = extractorAudio.readSampleData(audioBuf, offset);
                if (bufferInfo.size < 0) {
                    sawAudioEOS = true;
                    bufferInfo.size = 0;
                } else {
                    bufferInfo.presentationTimeUs = extractorAudio.getSampleTime();
                    bufferInfo.flags = extractorAudio.getSampleFlags();
                    int trackIndex = extractorAudio.getSampleTrackIndex();
                    muxer.writeSampleData(audioTrackIndex, audioBuf, bufferInfo);
                    extractorAudio.advance();
                }
            }
            muxer.stop();
            muxer.release();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception ex) {
            ex.printStackTrace();
        }

    }

}

Answer 1

将音频输出格式和编码器更改为AMR_NB

Android使用mediamuxer mediacodec和mediaextractor（没有mp4parser）合并mp4和aac文件

1 个答案: