如何做mp4视频压缩

Question

我将这个链接用于视频压缩。https://github.com/lalongooo/VideoCompressor当我压缩.mkv文件时，它的工作原理是较小的，但是当我压缩.mp4文件时，它的大小要大于视频的原始大小。 ..我不知道要为此做些什么...此代码将MediaCodec用于视频压缩器..是否可以快速压缩？

Answer 1

mkv and mp4 are just video container file formats, to multiplex compressed video data and audio data into one file. You should check what's the video compression format (H.264, H.265 etc. ) inside mkv or mp4 file.

Answer 2

SOLVED

Simply put the condition before calling the compression function. Check the selected video height and width using MediaMetaDataRetriever and set if condition.

public void compress() {

    Log.w("VideoMessage","eNTERED : "+inputPath);
    lMediaMetadataRetriever.setDataSource(inputPath);
    String lVideoWidth = lMediaMetadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_WIDTH);
    Log.w("VideoMessage","VideoWidth: "+lVideoWidth);
    String lVideoHeight = lMediaMetadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_HEIGHT);
    Log.w("VideoMessage","VideoHeight: "+lVideoHeight);
    if(Integer.valueOf(lVideoWidth)<=640 || Integer.valueOf(lVideoHeight)<=360){
        Toast.makeText(this, "Video Already in compressed form", Toast.LENGTH_SHORT).show();
    }
    else{
        try2CreateCompressDir();
        outPath=Environment.getExternalStorageDirectory()
                + File.separator
                + APP_DIR
                + COMPRESSED_VIDEOS_DIR
                +"VIDEO_" + new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US).format(new Date()) + ".mp4";

        new VideoCompressor.execute(inputPath,outPath);

    }
}