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Unable to import MP4 Ac-3 into vegas pro 13

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Thomas Sunless
Unable to import MP4 Ac-3 into vegas pro 13
on Sep 12, 2015 at 12:06:53 pm

I am trying to import a MP4 video with AC-3 audio but it is only importing the video. Can anyone help please?

Media Info:

General
Complete name : C:\Users\\Desktop\.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom
File size : 7.00 GiB
Duration : 1h 7mn
Overall bit rate : 14.9 Mbps
Encoded date : UTC 2015-08-30 16:57:01
Tagged date : UTC 2015-08-30 16:57:01
Writing application : MkvToMp4 [http://www.mkvtomp4.ru] version 0.224 (x64)

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 : 1h 7mn
Bit rate : 14.3 Mbps
Maximum bit rate : 40.6 Mbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.288
Stream size : 6.70 GiB (96%)
Title :
Writing library : x264 core 107 r1766 f9f0035
Encoding settings : cabac=1 / ref=4 / deblock=1:-3:-3 / analyse=0x3:0x113 / me=umh / subme=10 / psy=1 / psy_rd=1.05:0.10 / mixed_ref=1 / me_range=32 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=2 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=-2 / threads=12 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / constrained_intra=0 / bframes=6 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=23 / scenecut=40 / intra_refresh=0 / rc_lookahead=50 / rc=2pass / mbtree=1 / bitrate=14300 / ratetol=1.0 / qcomp=0.70 / qpmin=10 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / vbv_maxrate=40000 / vbv_bufsize=30000 / ip_ratio=1.40 / aq=1:0.80 / nal_hrd=none
Language : English
Encoded date : UTC 2015-08-30 16:57:01
Tagged date : UTC 2015-08-30 16:59:18

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 : 1h 7mn
Bit rate mode : Constant
Bit rate : 640 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
Stream size : 307 MiB (4%)
Title : DD5.1 640K
Language : English
Encoded date : UTC 2015-08-30 16:58:43
Tagged date : UTC 2015-08-30 16:59:18


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Norman Black
Re: Unable to import MP4 Ac-3 into vegas pro 13
on Sep 12, 2015 at 8:41:43 pm
Last Edited By Norman Black on Sep 12, 2015 at 8:43:09 pm

Vegas cannot handle an MP4 container with AC-3 audio. You will have to convert that audio to something Vegas can handle.

In MP4 containers, Vegas can handle
AVC video, AAC audio
mpeg-2 video (XDCAM), PCM audio
AVC video, PCM audio <= probably, but I've not tested.

If you can separate the AC-3 audio from the video, you could probably import the video and audio separately into Vegas.


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Aaron Star
Re: Unable to import MP4 Ac-3 into vegas pro 13
on Sep 12, 2015 at 10:26:38 pm

I posted this over on the BM Resolve forum which might help. AC-3 in an mp4 container will work with Vegas if you use the ACfilter, but that thing is RU ware, and I always get nervous with RU ware. Converting your footage audio to PCM would be your best bet.

http://forum.blackmagicdesign.com/viewtopic.php?f=21&t=37632&start=50

Re: .MTS
PostTue Sep 01, 2015 10:31 am

You are on the right track with the FFMPEG command. .MTS is not a codec it is a container. The Video is AVCHD and the audio is AC3. On PC you can get a windows AC3 codec free online, not sure about the MAC. Once you have the AC3 decoder the audio will play as normal.

The FFMPEG command to rewrap the codec is:

ffmpeg -i .mts -vcodec copy -acodec pcm_s16le -ar 48000 -ac 2 .avi

This will copy the AVCHD codec as is, and covert the audio to PCM16bit@48Khz with 2 channels inside a .AVI or .MOV container.

Change pcm_s16le to pcm_s24le for 24-bit audio.


You could also convert right to ProRes with this command.

ffmpeg -i .mts -vcodec prores -acodec pcm_s16le -ar 48000 -ac 2 .mov

Add -profile 2 or 3 to the command to get Normal or HQ



You can convert straight to DNxHD @ 45Mbs with this command:

ffmpeg -i .mts -vcodec dnxhd -s 1920x1080 -b:v 45M -acodec pcm_s16le -ar 48000 -ac 2 .mxf or .mov

Bump up the bit rate to the DNxHD profile bitrate you use.

ffplay will play the file.

ffprobe will give internal stats on the video file.



There was also this solution:

http://www.ac3filter.net/ - I would try that on Pc and see if it allows the audio playback on the mts imports.

BM needs to license the AC-3 codec from Dolby, which is an additional expense. I am sure that is making it a hard call for such low end footage from prosumer gear.


Using the FFMPEG process with the Video copy and transforming the audio to PCM should be very fast on any i7 Gen1 or later. You can wildcard the process and convert entire directories.


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