Avidemux - WMV file convert to MP4 - Audio stream garbled

[belltown]

I am trying to use avidemux 2.5.4 (r7200) running on Windows 7 to convert a Windows Media Video file to mp4 (MPEG-4 AVC, AAC (Faac)). When I try to play the converted file using either Windows Media Player or VLC media player, the video is fine but the audio is garbled and unintelligible, lots of hissing and screeching sounds.

This is the file I'm trying to convert:

General
Complete name                    : C:\Users\John\Desktop\250k.wmv
Format                           : Windows Media
File size                        : 30.2 MiB
Duration                         : 8mn 21s
Overall bit rate mode            : Constant
Overall bit rate                 : 505 Kbps
Maximum Overall bit rate         : 510 Kbps
Encoded date                     : UTC 2010-02-22 17:50:06.395

Video
ID                               : 31
Format                           : VC-1
Format profile                   : MP@LL
Codec ID                         : WMV3
Codec ID/Info                    : Windows Media Video 9
Codec ID/Hint                    : WMV3
Description of the codec         : Windows Media Video 9
Duration                         : 8mn 21s
Bit rate mode                    : Constant
Bit rate                         : 373 Kbps
Width                            : 320 pixels
Height                           : 240 pixels
Display aspect ratio             : 4:3
Frame rate                       : 25.000 fps
Bit depth                        : 8 bits
Scan type                        : Progressive
Compression mode                 : Lossy
Bits/(Pixel*Frame)               : 0.194
Stream size                      : 22.3 MiB (74%)
Language                         : English (US)

Audio
ID                               : 1
Format                           : WMA
Format version                   : Version 2
Codec ID                         : 161
Codec ID/Info                    : Windows Media Audio
Description of the codec         : Windows Media Audio 9.2 - 128 kbps, 44 kHz, stereo (A/V) 1-pass CBR
Duration                         : 8mn 21s
Bit rate mode                    : Constant
Bit rate                         : 128 Kbps
Channel(s)                       : 2 channels
Sampling rate                    : 44.1 KHz
Bit depth                        : 16 bits
Stream size                      : 7.65 MiB (25%)
Language                         : English (US)

This is the converted file:

General
Complete name                    : C:\Videos\junk2.mp4
Format                           : MPEG-4
Format profile                   : Base Media
Codec ID                         : isom
File size                        : 13.3 MiB
Duration                         : 8mn 21s
Overall bit rate                 : 223 Kbps
Movie name                       : junk2.mp4
Writing application              : Lavf52.108.0

Video
ID                               : 1
Format                           : AVC
Format/Info                      : Advanced Video Codec
Format profile                   : High@L1.3
Format settings, CABAC           : Yes
Format settings, ReFrames        : 4 frames
Codec ID                         : avc1
Codec ID/Info                    : Advanced Video Coding
Duration                         : 8mn 21s
Bit rate                         : 112 Kbps
Width                            : 320 pixels
Height                           : 240 pixels
Display aspect ratio             : 4:3
Frame rate mode                  : Constant
Frame rate                       : 25.000 fps
Color space                      : YUV
Chroma subsampling               : 4:2:0
Bit depth                        : 8 bits
Scan type                        : Progressive
Bits/(Pixel*Frame)               : 0.058
Stream size                      : 6.66 MiB (50%)
Writing library                  : x264 core 115 r1947 b5a8ad7
Encoding settings                : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / 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=6 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=26.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00

Audio
ID                               : 2
Format                           : AAC
Format/Info                      : Advanced Audio Codec
Format profile                   : LC
Codec ID                         : 40
Duration                         : 8mn 20s
Bit rate mode                    : Variable
Bit rate                         : 106 Kbps
Maximum bit rate                 : 128 Kbps
Channel(s)                       : 2 channels
Channel positions                : Front: L R
Sampling rate                    : 44.1 KHz
Compression mode                 : Lossy
Stream size                      : 6.33 MiB (47%)

Any idea what I can do to convert this file to MP4 AVC/AAC?

[Baldrick]

You could try a ffmpeg frontend like xmedia recode or maybe freemake video converter.

[davexnet]

Perhaps try the AVIdemux proxy. It uses Avisynth to open the file, and frameserves to AVIdemux itself.

[belltown]

Thanks. I was able to get this to work using avsproxy. It seems that the version of Avidemux that I'm using, 2.5.4 (r7200), does not support decoding of Windows Media Audio files. I tried one file that used WMA 9.2, and when I tried to play it using Avidemux, all I heard was a lot of screeching noise. I then tried playing a file that used WMA 10 Professional. In that case Avidemux said: "No audio decoder found for this file. Save (A+V) will generate bad AVI. Save audio will work".