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

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，无音频），并共享合并的 mp4 文件。合并后的mp4文件共享在三星J2和小米都可以，但是在联想、Micromax等手机上不能播放mp4文件。这里提到测试结果： 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还是由于不正确的复用以及问题的原因是什么。请帮忙。

recordAudio.java 中有共享代码，是这样的：

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

    }

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