[Matt Staroscik]

First, thank you kindly for your reply!

Well, the good news is that the issue seems to be some kind of playback problem. When I played the file back on another computer entirely, it sounded fine. So, there is something about the app that I used to check my rendered MP4 that is not working as expected, meaning this isn’t a Vegas problem.

More good news, when I checked my audio device settings I noticed that Vegas was not using the GPU to render. I assumed it would be on by default, and never looked… I flipped that on, and rendering is about 10x faster now.

My main problem with Vegas is that I use it about once every year or two, so every time I use it, I am starting from scratch! ????

Though, there is still one related issue I would like to resolve. When I was trying to solve this issue in Vegas, I wanted to look at the audio in SoundForge–there is a Vegas menu selection just for that. Unfortunately, according to the error message I got, SoundForge 10 cannot read AC-3 files, it seems.

Is this expected, or is it because my ancient camera produces some kind of non-compliant AC-3 file? Does Vegas 15 come with a newer version of SoundForge that understands 5.1 AC-3 files?

Below is the complete MediaInfo output for my source file. (Technically it isn’t a raw source file–Vegas saw my camera and imported the clip, stitching together 2 MTS files from the camera filesystem.)

Thanks again!

General
ID : 0 (0x0)
Complete name : C:\Users\staro\Documents\Imported Media\00001_20180701_073702.mts
Format : BDAV
Format/Info : Blu-ray Video
File size : 3.90 GiB
Duration : 58 min 5 s
Overall bit rate mode : Variable
Overall bit rate : 9 612 kb/s
Maximum Overall bit rate : 18.0 Mb/s
Recorded date : 2018-07-01 07:07:35-07:00
Writing application : Sony HDR-CX700V

Video
ID : 4113 (0x1011)
Menu ID : 1 (0x1)
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4
Format settings : CABAC / 2 Ref Frames
Format settings, CABAC : Yes
Format settings, RefFrames : 2 frames
Format settings, GOP : M=2, N=15
Codec ID : 27
Duration : 58 min 5 s
Bit rate mode : Variable
Bit rate : 8 773 kb/s
Maximum bit rate : 16.0 Mb/s
Width : 1 440 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate : 29.970 (30000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Interlaced
Scan type, store method : Separated fields
Scan order : Top Field First
Bits/(Pixel*Frame) : 0.188
Stream size : 3.56 GiB (91%)
IrisFNumber : 3.400000

Audio
ID : 4352 (0x1100)
Menu ID : 1 (0x1)
Format : AC-3
Format/Info : Audio Coding 3
Codec ID : 129
Duration : 58 min 5 s
Bit rate mode : Constant
Bit rate : 448 kb/s
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 kHz
Frame rate : 31.250 FPS (1536 SPF)
Bit depth : 16 bits
Compression mode : Lossy
Delay relative to video : -67 ms
Stream size : 186 MiB (5%)
Service kind : Complete Main

Text
ID : 4608 (0x1200)
Menu ID : 1 (0x1)
Format : PGS
Codec ID : 144
Duration : 58 min 4 s
Delay relative to video : -67 ms