Sound echo after creating video file

[Davidk]

Using X5 to create a video file from a project file in the timeline.

After the file completes rendering, the project preferences default is set to play the rendered file. But I find that when the playing commences after rendering, the sound has an echo effect that isn't part of the original files. Like the original sound is reflecting off walls, and you get the same sound just spaced apart by a small time period. I've tracked this to what appears to be X5 playing both the rendered file and the project file at the same time. If I turn the project preferences item "play after render" off, off course nothing happens after rendering completes. And separately playing the rendered file, the sound is normal.

Is there a way to stop this echo effect? Ideally, just play the rendered file only. But failing that, change the preferences default. However, there does not seem to be any way to change the project preferences default for this item.

Davidk

[lata]

Hi David

That seems very strange, I have not heard of video studio playing two files other than in project playback which plays all time-lines.

I do not disable play after render, but must admit I rarely listen to it as I usually miss the beginning I stop play to start at again. As far as i know it should only play the newly rendered file and there are no options to change that.

[Davidk]

ummmm.

I've not had this effect before, that is, it seems to be a feature of X5 which I only upgraded to from VS11+ last March. I had a concentrated session on rendering in July/August, and again in the last week. When I first noticed it, it really threw me. The rendering sounded like it had stuffed up somehow. Took a while and lots fiddling to conclude the 2 files at once scenario, but I suppose there may be other possibilities. I relaxed a bit when I realised that the rendered file was not at fault in itself.

Live with it seems to be the go, buts its irritating . . . .

Davidk

[lata]

Hi Davidk

I did render a Mpg just to test the playback and it was normal.
Clip and Project playback has been the same for all versions of Video Studio.
I do not think they changed things just for X5.
I assume it is something particular to your system, either the rendering or installation of VS. Certainly not a normal occurrence of X5, have you tried re-installing the program?

Hopefully someone else will comment

There is another similar post regarding Sound in MPG files but don’t think it is the same issue.

[Davidk]

Tried that after your post. Originally wondered if there could have been some interaction with X5 and the old VS11+ installs. So ...
- Uninstalled X5 using control panel. Compliments to Corel - best uninstall I've seen yet - no leftovers in the file system anywhere I could find. But ...
- took 2 scans with a registry scanner and a re-start in between to clean out the registry of old x5 references.

Then, a clean install of X5 from the program disks. That went Ok.

On next use, loading a.mod file, and share/create video file to a .mpg with project settings - same problem. When the render completes, the display panel; switches from project mode to clip and plays the rendered clip with the echo I've described.

Something I noticed with the new install was a blue strip along the bottom of the timeline clips with a speaker symbol on it. I've not consciously seen this before and may be relevant. see attached image. What does it mean?

Davidk

[lata]

Hi

The blue bar to the lower part of the thumbnail indicates that the video contains an audio stream, nothing new, I think has always been there.
If you add one of the samples from the library you may see this bar as grey.

We seem to be heading in a similar direction as your other post with regards to the Mod files.
They cause a crash and produce a strange sound echo.

Can you right click the original Mod file select properties, what are they?
You can Copy the window to create an Image to attach to your post.

Then when you convert to Mpeg what options do you actually use.
Right click the new Mpeg file and again post the properties.

Are you able to make a Mod file available for download, maybe uploading to 4Shared?

[Davidk]

Hi Trevor,
two jpg images of the properties a clip file attached:

The sound properties of the mod file ex camera are the default, and the sound properties for the converted file are also the X5 default.
This is (deliberately) a small file, can easily upload. Where to???

Davidk

[Davidk]

Hi,

I think I've found the cause. In adding the 2 properties images to the last post I noted that X5 changed the sound from Dolby in the original to LPCM in the rendered result, which is the program default. Now, previously I'd been using Dolby sound in all the converted clips, but about 3 months ago I was persuaded to use LPCM as a more widely usable audio codec in results burnt to DVD. Essentially, since there was no license fee attached to its use in various players. And that led to changing the project properties. I also noted (after the re-install yesterday) that LPCM was also the X5 default, possibly for the same reason. So, to some test results.

1. mod dolby clip file converted to mpg with LPCM audio in the result - sound echo in result
2. mod dolby clip file converted to mpg with dolby audio in the result - no sound echo in result.
the source mod clip file then changed filetype to mpg, as suggested:
3. modified filetype clip file converted to mpg with LPCM as the audio in the converted file - sound echo in result
4. modified filetype clip file converted to mpg with Dolby as the audio in the converted file - no sound echo in result

I've reviewed the camcorder (and its manual) and it has only one sound system - Dolby. It's not specified to have any other and there's no provision in the settings menu in the device to change it.

So it seems that the X5 sound conversion from Dolby to LPCM is what is producing the echo effects after rendering. And I suspect that's because X5 is playing the source (its still the .mod file in the timeline) and result at the same time, and there's enough of a time difference between the 2 sound codecs to give that echo result. Why that should be the case (playing both at the same time), I don't know however note that I previously said that if I loaded the .mod or converted .mpg files separately, the sound was OK.

Davidk

[lata]

Hi Davidk

Your Mod file shows what I describe as a DVD compliant Mpeg2 file.

If you set Show Messages……… from F6 Preferences, when you add the first video you should be able to match the project properties, if not use Windows Explorer to re-name a file to use Mpg, then try inserting a video file, first start a new project, once the project properties match then the option Share Create Video File – Same as Project Properties and Same as First Clip should be available and use the same settings.

The file size difference you are experiencing is purely the difference in data rate 8900kbps to 8000kbps.

The echo you hear in the playback is still very strange to me, I do not think Video Studio is playing two clips but just the one in the library, I cannot explain why this is happening.?

As a thought unplug or switch off any mic’s you have attached to the pc, just in case it’s a playback issue.

The Mod sample you show is about 8 Mb this is small enough to e-mail, you will find my address vie my Quick Guide. Quite interested in trying this sample?

[Davidk]

Hi Trevor,

Re microphones - there is one normally connected but its turned off (switch on the mic stem) when not in use to record voice over.

That .mod file is on its way to you by email.

As to why the echo is there only after rendering a project with play the rendered file option set - so far, all the possibilities seem unusual. The dual playback of project file and rendered file is the only thing that seems plausible in the circumstances. The thing which has stuck in my investigation is that 'play after render' is the only condition that produced the echo. And the echo is close enough to make the sound seem loud and quite fuzzy. You should be able to duplicate my results.

I've also looked at and discarded:
- excessive volume control on the local speakers
- possibility of stereo playing issues via the audio panel
but none of those really checked out. The apparent breakthru of finding that dolby audio did not echo after render simply served to ask why did LPCM audio echo and not dolby? The recent adoption of LPCM as the default audio coded reinforced why I had not seen this effect earlier and I'm - for the moment - going to use dolby as the rendering audio codec until there's a definitive answer for this.

David

[lata]

Hi David

Still waiting for the e-mail containing the Mod file, I have looked at my junk folder but nothing there.

The LPCM option has always been the default audio for Video Studio’s DVD Mpeg2 templates, as far back as i can remember...
Earlier versions allowed you to choose Mpeg Audio as being Pal compliant, with the introduction of Digital Dolby the Mpeg option was dropped.

I think but may be corrected but LPCM is a compliant standard for NTSC video, so being the default makes sense as the program is NTSC based, just view the video samples provided in the library.

Any way try sending the Mod again?

[lata]

Hi David

Thanks for the sample Mod file.

I have created several video files using different settings.
The sound is difficult to interpret as it’s a chatter from a market place, maybe Vietnam, but the words are hard to decipher and difficult to hear any echo.

When I share Create Video File DVD the Mpeg Optimiser is activated, if I choose “Accept” it uses the original properties, just the same as using Same as First clip including Digital Dolby
If I choose “cancel” it uses VS default and LPCM audio.

I have added the clip three times just to extend the project and give me something to watch.

I cannot see or hear any difference from the original to the immediate playback.

Using Video Studio Screen Capture you should be able to record this echo sound as it will record the system sound, then compare the results with the original video sound.

I also re-named the Mod to use Mpg without problems, mind you I have had no problems using the Mod file, not surprising as its only a few seconds long.

[canuck]

Hi Trevor,

would it be possible for you to upload (with David's persmission of course) the mod file to a website (4shared.com). That way others could also see if they can duplicate David's problem.

[lata]

Hi canuck

Sorry yes quite remiss of me, would welcome your opinion......

http://www.4shared.com/file/zDujdLlO/4M ... ket_3.html

[canuck]

I have tried all sorts of "combinations and permutations" but could not discern any echo at any point. The video though is very short and has so much background noise that make it difficult to pick out any echo if there is one.