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Vegas 14 -- Audio in editor sounds fine, but it sounds clipped when rendered to MP4

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Matt Staroscik
Vegas 14 -- Audio in editor sounds fine, but it sounds clipped when rendered to MP4
on Jul 1, 2018 at 10:18:46 pm

I have a really simple project based on video imported from a Sony AVCHD camera. The audio was captured by the camera's own mic and recorded in 5.1. I have no idea what the original codec is, but the camera stores MTS files.

In the project preview, it sounds fine.

When exported as MP4, it sizzles and sounds like it's clipping.

Is there anything I can do in Vegas to fix this? While I have SoundForge, the built-in feature that lets you adjust a Vegas audio track in SoundForge won't work with this video clip, it says it cannot read audio data. The camera is about 8 years old though so that may be a factor.


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Francois Pénzes
Re: Vegas 14 -- Audio in editor sounds fine, but it sounds clipped when rendered to MP4
on Jul 2, 2018 at 2:23:34 am

Hi Matt

If the audio sounds good in preview, then it was recorded fine. I would start by looking at your audio settings in Preferences, Audio Device. Also take a look at the Advance tab. I am assuming here that you have a dedicated audio card.

This would help us help you. https://sourceforge.net/projects/mediainfo/ It will tell us a lot about your original file.

Cheers !

PC Win 10 Pro 64-bit 16gb Intel® Core™i7-2600k Quad Core 3.40GHz
Cameras: Canon XF305 + Canon XH-A1
Blackmagic HyperDeck Studio Mini
Vegas Pro 14, User since Vegas 3.0

''When the cutting stops, the editing begins...''


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Matt Staroscik
Re: Vegas 14 -- Audio in editor sounds fine, but it sounds clipped when rendered to MP4
on Jul 2, 2018 at 3:34:45 am

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:&#092;Users&#092;staro&#092;Documents&#092;Imported Media&#092;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


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Francois Pénzes
Re: Vegas 14 -- Audio in editor sounds fine, but it sounds clipped when rendered to MP4
on Jul 2, 2018 at 11:54:38 am

Hi Matt

AC-3 is a delivery format not an editing format. You would have to convert that AC-3 file to an editable format of your liking, say, a Uncompressed PCM .WAV for example.

Cheers !

PC Win 10 Pro 64-bit 16gb Intel® Core™i7-2600k Quad Core 3.40GHz
Cameras: Canon XF305 + Canon XH-A1
Blackmagic HyperDeck Studio Mini
Vegas Pro 14, User since Vegas 3.0

''When the cutting stops, the editing begins...''


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