I have lots of videofiles in mp4 format in a directory where the audio in all of them is compressed (speeded up to fit the first 1/3 (exactly) of the video's time oddly enough).
And of course I need to fix this, so that the audio fits the video.
How do I proceed with this in the easiest and most convenient way in a batch-mode (no fun going through 100's of files manually)?

All of the files have the same error so if it works for one, it works for all I recon and should be simple enough for someone with skills and knowledge.

I hope someone here can come up with a simple/elegant solution to this problem.


Here's the detailed info (sample - they vary in length due to them being captured analog video, but as you can see..audio is 1/3rd and needs stretching):

General
Format : MPEG-4
Format profile : Base Media
Codec ID : isom
File size : 18.0 MiB
Duration : 16s 143ms
Overall bit rate mode : Variable
Overall bit rate : 9 366 Kbps
Writing application : Lavf53.22.0

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Baseline@L1.3
Format settings, CABAC : No
Format settings, ReFrames : 1 frame
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 16s 143ms
Bit rate : 9 320 Kbps
Width : 1024 pixels
Height : 768 pixels
Display aspect ratio : 4:3
Frame rate mode : Variable
Frame rate : 16.726 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.806
Stream size : 17.9 MiB (100%)
Writing library : x264 core 118 r2085 8a62835
Encoding settings : cabac=0 / ref=1 / deblock=1:0:0 / analyse=0x1:0x111 / me=hex / subme=6 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=12 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=0 / weightp=0 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=1 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=20.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / 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 : 5s 388ms
Bit rate mode : Variable
Bit rate : 128 Kbps
Maximum bit rate : 1 411 Kbps
Channel count : 2 channels
Channel positions : Front: L R
Sampling rate : 44.1 KHz
Compression mode : Lossy
Stream size : 84.2 KiB (0%)