.mkvmplayer2 无法播放某些文件的声音。我安装了它vlc，它可以播放声音。mplayer2 输出：
MPlayer2 2.0-728-g2c378c7-4+b1 (C) 2000-2012 MPlayer Team
Playing Invisible Gaps in the Wall-_qUKE6Y5z04.mkv.
[mkv] Track ID 1: video (V_MPEG4/ISO/AVC), -vid 0
[mkv] Unknown/unsupported audio codec ID 'A_OPUS' for track 2 or missing/faulty
[mkv] private codec data.
[mkv] Track ID 2: audio (A_OPUS), -aid 0, -alang eng
[mkv] Will play video track 1.
Detected file format: Matroska
Clip info:
MAJOR_BRAND: dash
MINOR_VERSION: 0
COMPATIBLE_BRANDS: iso6avc1mp41
CREATION_TIME: 2015-09-22 13:11:41
ENCODER: Lavf56.1.0
Load subtitles in .
Failed to open VDPAU backend libvdpau_r600.so: cannot open shared object file: No such file or directory
[vdpau] Error when calling vdp_device_create_x11: 1
[ass] auto-open
Selected video codec: H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 [libavcodec]
Audio: no sound
Starting playback...
VIDEO: 1920x1080 25.000 fps 0.0 kbps ( 0.0 kB/s)
VO: [xv] 1920x1080 => 1920x1080 Planar YV12
V: 0.7 0/ 0 9% 6% 0.0% 0 0
Exiting... (Quit)
我尝试使用不同的编解码器，例如lavc，，ffaac...pcm和--audio-demuxer=mkv，但都无济于事。我已经libopus0安装了。mplayer2 来自 Debian 稳定存储库。我尝试下载最新的 MPlayer 而不是不再受支持的 mplayer2，但它无法编译。
有什么办法可以解决这个问题吗？我不太喜欢 vlc 或 mpv...