Avidemux Forum

I searched everywhere and still can't find the answer.

I have a video file that only has one audio track, and it says "Surround Sound". VLC plays it with no problems.

But importing the video file into avidemux only seems to import the rear audio channels. Is there any way to fix this?

General
Complete name : directory removed
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42
File size : 2.42 GiB
Duration : 2h 16mn
Overall bit rate : 2 542 Kbps
Encoded date : UTC 2012-02-12 05:53:29
Tagged date : UTC 2012-02-12 08:47:08
Writing application : HandBrake 4415svn 2012012101

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.1
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 2h 16mn
Bit rate mode : Variable
Bit rate : 2 100 Kbps
Width : 1 280 pixels
Height : 536 pixels
Display aspect ratio : 2.40:1
Frame rate mode : Variable
Frame rate : 23.976 fps
Minimum frame rate : 23.968 fps
Maximum frame rate : 23.981 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.128
Stream size : 1.99 GiB (82%)
Writing library : x264 core 119
Encoding settings : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=9 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=9 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=240 / keyint_min=24 / scenecut=40 / intra_refresh=0 / rc_lookahead=50 / rc=abr / mbtree=1 / bitrate=2100 / ratetol=1.0 / qcomp=0.60 / qpmin=3 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Encoded date : UTC 2012-02-12 05:53:29
Tagged date : UTC 2012-02-12 08:47:08
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709

Audio
ID : 2
Format : AC-3
Format/Info : Audio Coding 3
Mode extension : CM (complete main)
Format settings, Endianness : Big
Codec ID : ac-3
Duration : 2h 16mn
Bit rate mode : Constant
Bit rate : 448 Kbps
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Compression mode : Lossy
Delay relative to video : 83ms
Stream size : 437 MiB (18%)
Language : English
Encoded date : UTC 2012-02-12 05:53:29
Tagged date : UTC 2012-02-12 08:47:07

what version of avidemux?
Should work with 2.6.4

I had 2.6.3...

Just upgraded to 2.6.4 and it still doesn't import properly.

U want to keep the 6ch with copy , or are downmixing it to less channels and then only back channel used?
that prob i had in older versions, not the latest

Now i've seen (heard ) the prob.
Using 8859.
I got a season of an HBO show with AC3 6CH.
Video is done well, but the downmix to 2ch AAC is some episode are only back channel and some are only right channel.

If i look at position when it happens, it is all the time the same.
Episode intro goes well mixeddown.
When it switch to HBO video logo.bang audio freaked out and uses back channel only or rightchannel only.
So, some how the encoding audio codec gets triggered loosing info.
I've u wanne dig into this, i don't know what info u want to reproduce the prob.
i cant make a small mkv of a episode intro and cut it after HBO video logo

For me its not a high prio, i use another program to mixdown the channels to stereo and mux it with the video avidemux generated

the problem could be that  it switches between stereo and 6 channel
you could try this  : export ac3 channel to foobar.ac3 and reload it as external audio track
You must have the start having 6 channels

This is whats happend.

So my guess after HBO its doesnt know anymore how to switch back to reading 6ch and still reads in 2ch.
but its me just guessing
ow and p.s.
thx for triggering me to look into loading external audio didnt see that 1, thought it was just audio select
learning learning all the time