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），并共享合并后的 mp4 文件。合并后的mp4文件共享在三星J2和小米可以，但是mp4文件在Lenovo、Micromax和其他phones.The测试结果中无法播放这里提到： 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 muxing 以及问题的原因。请帮忙。

共享代码存在于 recordAudio.java 中，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