'pops' in audio after doing a simple clip

[PeterHF]

This is a repeat of my other post on the subject because my original post refers to down conversion from HD which is no longer pertinent to my problem because I am now just doing a simple edit of an MPEG2 DVD file.

What I do is take a 45 minute MPEG2 DVD file and clip out and share a short section of it. I retain the project settings. When I play the short clip back there are noticeable pops in the audio. I've tried changing the bitrate of the audio. Don't know what else to try.

I tried the same task in my Roxio Premier 8 software on the same hardware and it works fine.

Any suggestions?

[Black Lab]

Is the pop present on the finished product, or just at the preview stage? I've noticed it sometimes during preview but after burning it is usually fine.

If on the final product, did you use Dolby? I sometimes have this with Dolby. Changing to LPCM solves my problem.

[PeterHF]

Thanks for the input Black Lab. But sorry to say that switching to LPCM audio did not help either.

This is very frustrating. I start with a large (3.5 gig) mpeg file. When I play this large file with Windows media player, the audio is clean. I load the file into Ulead VS 10+, create a short 15 second clip from about 11:30 minutes into the video and output this file. The resulting 15 second clip has pops in it about every second.

I like the Ulead software and would like to buy it but I can't use it if I am unable to produce files that have screwed audio!

Any other ideas would be greatly appreciated.

(BTW, in case you missed it in one of my previous posts, I've used Roxio software to do the same thing and the resulting clip is just fine as far as the audio is concerned. Problem is, the Roxio software sucks in other ways.)

[PeterHF]

Sorry Black Lab, I forgot to answer one of your questions. Yes, the poor audio is present in the output file when playing it back in Media Player (or any of the other players I have tried for that matter).

[LV_426]

Not helping....but just reporting that I reliably get the same problem with VS10+ when I'm working with a file that's been imported from a disc made by my Pioneer tabletop DVD Recorder with a DD2.0 soundtrack. It does not occur when I write the disc on my tabletop machine with a LPCM soundtrack.

The clicking is audible on preview of the project in VS10+ but not when previewing the clip. And it's present in the output regardless of whether it's smart-rendered or not.

[maddrummer3301]

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[BuZZarD]

Are you using more than 1 audio track?
If yes, I hane no idea, but if you are using both audio tracks, then I've found that the volume needs to be lowered slightly for both tracks to prevent 'clipping' or possibly the popping sound you hear.

[BuZZarD]

Also, I use a dedicated sound editor such as 'med soundstudio' or 'soundforge' to edit my clips.

Just seperate the audio from video in VS and save it as a soundclip (save more than you need), then trim it using the sound editor.

Load it back in to VS and it should be good.

[LV_426]

Are you using more than 1 audio track?
If yes, I hane no idea, but if you are using both audio tracks, then I've found that the volume needs to be lowered slightly for both tracks to prevent 'clipping' or possibly the popping sound you hear.

One track (DD2.0 Stereo/Surround). Thanks for the suggestion, but this isn't clipping due to excessive level. Something else.

Here is a picture of a waveform:


Exactly half way between the two markers, you'll see the level drop almost instantly to 0db and then recover a few samples later. This replays as a click. Exactly the same thing is in this file at exactly one second intervals (you'll note the duration at the top of the picture shows exactly 2 seconds at the point where the level drops; there is one before this, and more afterwards).

This extract was created like this:

- The source (which does not contain this glitch) was recorded onto the Hard Drive in my Pioneer 520 (tabletop HDD-DVD recorder) from VHS and encoded with a DD2.0 soundtrack. It is in PAL format.
- It was high-speed copied onto a rewritable DVD in Video format.
- It was extracted from the DVD onto my PC's hard drive using VS10+
- The Temporary .mpg file was placed onto the timeline in VS10+
- Preview in and out points were marked
- VS10+ was asked to share as Audio, LPCM, 44100hz 16 bit stereo (i.e. CD standard) the preview range (which I had set to about 12 seconds only)
- The wave file thus created was opened in a wave editor and this screen print taken.

Note: I would get glitches if I shared as DD2.0 - but I've no means to take a screenshot of the effect - hence CD quality wav.

[wh5916]

This is a repeat of my other post on the subject because my original post refers to down conversion from HD which is no longer pertinent to my problem because I am now just doing a simple edit of an MPEG2 DVD file.

What I do is take a 45 minute MPEG2 DVD file and clip out and share a short section of it. I retain the project settings. When I play the short clip back there are noticeable pops in the audio. I've tried changing the bitrate of the audio. Don't know what else to try.

I tried the same task in my Roxio Premier 8 software on the same hardware and it works fine.

Any suggestions?

I had similar problems with the trial of VideoStudio 10--and it's the reason I haven't purchased the product.

[Black Lab]

This extract was created like this:

- The source (which does not contain this glitch) was recorded onto the Hard Drive in my Pioneer 520 (tabletop HDD-DVD recorder) from VHS and encoded with a DD2.0 soundtrack. It is in PAL format.
- It was high-speed copied onto a rewritable DVD in Video format.
- It was extracted from the DVD onto my PC's hard drive using VS10+
- The Temporary .mpg file was placed onto the timeline in VS10+
- Preview in and out points were marked
- VS10+ was asked to share as Audio, LPCM, 44100hz 16 bit stereo (i.e. CD standard) the preview range (which I had set to about 12 seconds only)
- The wave file thus created was opened in a wave editor and this screen print taken.

Did you try copying at "normal" speed?

[maddrummer3301]

.

[inteljoc]

Hi,

I had the exact same problem. If I listen to the video in the library (source file), it plays nice with good sound. But when adding the video from the library on the timeline, it was doing some some 'pops' on the soundtrack.

So I downloaded the Update for UVS10 SP1 and it solved the problem. Works fine now.

Here's the link:http://www.ulead.com/tech/vs/vs_ftp.htm