HELP NEEDED: 5.1 Audio Test

---

Asking for help from anyone who has a 5.1 audio setup to his/her PC.

At issue is ffmpeg's bug in incorrectly mapping channel order from AC3 (and perhaps other formats) to AAC. Before, you had to remap the channels using an intermediate app like sox. But my current testing (on a 2-speaker setup) shows that there isn't an issue. Confirmation from a 5.1 setup is needed.

Attached below are 4 audio test clips: 5.1 WMA, 5.1 AC3, 5.1 AAC (from WMA clip), 5.1 AAC (from AC3 clip). The clips tell you which channel the sound is supposed to come out of, eg "front left".."front right"..etc. The LFE channel will be a mumbling sound coming out of the subwoofer.

I would appreciate it if someone with a 5.1 audio setup would test all 4 clips, and tell me if the channel orders are correct for all four. The clips are only 9 secs long apiece. Thanks in advance.

They all play correct for me.

I appreciate the assist.

I still get wrong order when converting 5.1 AAC to 5.1 AC3.
which ffmpeg version are u using?

Mapped fine here, too.

Someone sent me a PM asking which build of ffmpeg I'm using (for the correct AC3->AAC mapping). Not sure if I sent a reply, so I'm cc'ing a copy here.

I'm using the Zeranoe build. This is from AC3 to AAC. I didn't test the other way. (If one way comes out OK, the other should as well, but you never know.)

http://ffmpeg.zeranoe.com/builds

ffmpeg version N-31031-gf211d9d, Copyright (c) 2000-2011 the FFmpeg developers
built on Jun 26 2011 22:50:39 with gcc 4.5.3
configuration: --enable-gpl --enable-version3 --enable-memalign-hack --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
libavutil 51. 10. 0 / 51. 10. 0
libavcodec 53. 7. 0 / 53. 7. 0
libavformat 53. 4. 0 / 53. 4. 0
libavdevice 53. 1. 1 / 53. 1. 1
libavfilter 2. 24. 0 / 2. 24. 0
libswscale 2. 0. 0 / 2. 0. 0
libpostproc 51. 2. 0 / 51. 2. 0

The AAC was created by converting the AC3 to 6-channel WAV, then piped to NeroAACEnc external encoder.

ffmpeg -i inputfile -vn -acodec pcm_s16le -ac 6 -f wav - -map 0.1 | neroAACEnc -q 0.4 -ignorelength -if - -of out.m4a