Getting audio into movie

I recently downloaded 3 movies where the movie doesn’t have any audio in it but instead has 3 .ac3 files with it. I was wondering how I would go about putting the audio in.
Answer #1
try AVIsemux
open the file in it and select the AC3 file thro the “audio” menu
Answer #2
What type of video containers do the Movies have? MKV, avi etc
I would be very surprised to see Movies with separate audio files, that is not something that is usually done. Try MediaInfo and see what it shows for the Movie. It’s possible that you are missing a codec so the audio doesn’t play.
Answer #3
Oh thank God. That worked.
Mighty_Marvel replied: What type of video containers do the Movies have? MKV, avi etc
I would be very surprised to see Movies with separate audio files, that is not something that is usually done. Try MediaInfo and see what it shows for the Movie. It's possible that you are missing a codec so the audio doesn't play.
MKV. It only had the video and no audio. MediaInfo didn’t show anything under “audio codec” tho. If you’re curious tho.. here’s all the info MediaInfo showed me
Format : Matroska
Format version : Version 2
File size : 2.98 GiB
Duration : 1h 35mn
Overall bit rate : 4 495 Kbps
Encoded date : UTC 2010-12-18 14:58:41
Writing application : mkvmerge v3.1.0 (‘Happy up here’) built on Jan 19 2010 12:09:24
Writing library : libebml v0.7.9 + libmatroska v0.8.1
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.0
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Codec ID : V_MPEG4/ISO/AVC
Duration : 1h 35mn
Bit rate : 4 500 Kbps
Width : 1 920 pixels
Height : 816 pixels
Display aspect ratio : 2.35:1
Frame rate mode : Variable
Frame rate: 23.976 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.120
Stream size : 2.92 GiB (98%)
[mkvonly]
Writing library : x264 core 88
Encoding settings : cabac=1 / ref=4 / deblock=1:-1:-1 / analyse=0x3:0x133 / me=umh / subme=9 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=32 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=12 / sliced_threads=0 / nr=0 / decimate=1 / mbaff=0 / constrained_intra=0 / bframes=5 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / wpredb=1 / wpredp=2 / keyint=240 / keyint_min=24 / scenecut=40 / intra_refresh=0 / rc_lookahead=50 / rc=2pass / mbtree=1 / bitrate=4500 / ratetol=1.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / aq=1:1.00
Language : English
Default : Yes
Forced : No
Color primaries : BT.709-5, BT.1361, IEC 61966-2-4, SMPTE RP177
Transfer characteristics : BT.709-5, BT.1361
Matrix coefficients : BT.709-5, BT.1361, IEC 61966-2-4 709, SMPTE RP177
Text #1
ID : 2
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Language : English
Default : Yes
Forced : No
Text #2
ID : 3
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Language : Czech
Default : No
Forced : No
Text #3
ID : 4
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Language : Danish
Default : No
Forced : No
Text #4
ID : 5
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Language : Dutch
Default : No
Forced : No
Text #5
ID : 6
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Language : French
Default : No
Forced : No
Text #6
ID : 7
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Language : Hungarian
Default : No
Forced : No
Text #7
ID : 8
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Language : Norwegian
Default : No
Forced : No
Text #8
ID : 9
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Language : Portuguese
Default : No
Forced : No
Text #9
ID : 10
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Language : Romanian
Default : No
Forced : No
Text #10
ID : 11
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Language : Spanish
Default : No
Forced : No
Text #11
ID : 12
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Language : Swedish
Default : No
Forced : No
Answer #4
I’m surprised to see that because it doesn’t make much sense to upload a video with no included audio.
If you open the MKV using MKVMerge GUI which is part of the MKVToolnix package you can add the audio using that and save it out under a new name.
http://www.bunkus.org/videotools/mkvtoolnix/downloads.html#windows