NO audio only loud hiss on burnt DVD's

Quest

New member
Hello,
I am trying to burn a DVD from an AVI captured with BlackMagic Media express.
The AVI will play fine in all programs including VRD but when I try to burn it with VRD there is no audio on the DVD only an extremely loud hiss.
The only way I can make a DVD with audio is to change the output settings to MPEG Layer 2.
I would prefer to leave it at LPCM.
Can anyone help with this issue?
 

Dan203

Senior Developer
Staff member
We have some routines to convert LPCM so that it's compatible with DVD but they haven't been tested extensively. Can you post the MediaInfo for the source video? I'd like to see the exact params of the audio stream.
 

Quest

New member
Is there a specific program I should use to get this info?
I used one and it spit out the following:

ID : 1
Format : PCM
Format settings : Little / Signed
Codec ID : 00000001-0000-0010-8000-00AA00389B71
Duration : 51 min 20 s
Bit rate mode : Constant
Bit rate : 2 304 kb/s
Channel(s) : 2 channels
Sampling rate : 48.0 kHz
Bit depth : 24 bits
Stream size : 846 MiB (1%)
Alignment : Aligned on interleaves
Interleave, duration : 1034 ms (31.00 video frames)
 

Dan203

Senior Developer
Staff member
Ok I see the issue. It's the 24bit audio. 24bit audio is stored weirdly on DVDs. I added code to try and convert it, but I was never able to test it so it may not work correctly. In fact even if I'm converting it correctly I'm not 100% sure if our DVD authoung API supports 24bit PCM. If you convert the audio to 16bit it should work ok.
 

Quest

New member
Well, I don't believe that is an option as I don't see a way in BlackMagic Media Express to lower the quality.
I guess as I have read it's based on professional standards they didn't include an option?
 

Dan203

Senior Developer
Staff member
You can do it in VideoReDo, but it'll require an extra step. Can you post the media info for the video portion too so I can give you the best settings for the profile that'll make a DVD complaint file so you don't have to recode twice?
 

Quest

New member
I will post that tomorrow, but to be honest I would much rather just be able to do a capture then open it in VRD and burn it without making any changes. :/

Thanks for your help!
 

Dan203

Senior Developer
Staff member
I will post that tomorrow, but to be honest I would much rather just be able to do a capture then open it in VRD and burn it without making any changes. :/

Thanks for your help!
No easy way to do that yet. We don’t have a way to modify the audio bit depth in the DVD dialog. It's in the profile code, but not exposed in DVD. I can add that in v6 but we're not currently making changes to v5 unless there is a showstopper bug.
 

Quest

New member
Here is the video info:

ID : 0
Format : YUV
Codec ID : UYVY
Codec ID/Info : Uncompressed 16bpp. YUV 4:2:2 (Y sample at every pixel, U and V sampled at every second pixel horizontally on each line). A macropixel contains 2 pixels in 1 u_int32.
Duration : 51 min 20 s
Bit rate : 168 Mb/s
Width : 720 pixels
Height : 486 pixels
Display aspect ratio : 3:2
Frame rate : 29.970 (30000/1001) FPS
Standard : NTSC
Color space : YUV
Chroma subsampling : 4:2:2
Compression mode : Lossless
Bits/(Pixel*Frame) : 16.000
Time code of first frame : 00:00:00:00 / 00:00:00:00
Time code source : Adobe tc_A / Adobe tc_O
Stream size : 60.2 GiB (98%)
 

Dan203

Senior Developer
Staff member
Here is the video info:

ID : 0
Format : YUV
Codec ID : UYVY
Codec ID/Info : Uncompressed 16bpp. YUV 4:2:2 (Y sample at every pixel, U and V sampled at every second pixel horizontally on each line). A macropixel contains 2 pixels in 1 u_int32.
Duration : 51 min 20 s
Bit rate : 168 Mb/s
Width : 720 pixels
Height : 486 pixels
Display aspect ratio : 3:2
Frame rate : 29.970 (30000/1001) FPS
Standard : NTSC
Color space : YUV
Chroma subsampling : 4:2:2
Compression mode : Lossless
Bits/(Pixel*Frame) : 16.000
Time code of first frame : 00:00:00:00 / 00:00:00:00
Time code source : Adobe tc_A / Adobe tc_O
Stream size : 60.2 GiB (98%)
I've attached a profile. Go to Tools->Edit output profiles and click the import button. Find this profile and import it. (will be called "DVD Compliant") Open your file, make your edits and use the standard Save dialog to save the file using this profile. Open the resulting file and save to DVD. Because it's already DVD complaint the conversion to DVD should be fast and the audio should work.
 

Attachments

Quest

New member
ok, after changing it from a .txt to a .xml i was able to do that then saved it and it saved as an .mpg.
When I went to save it to DVD it was just going to save the .mpg to the DVD as a file, So I tried to burn it to DVD and it worked but the Audio is VERY loud and the video goes from good to blocky about every 3 seconds or so, not bad but it's not like that on the DVD's I burned with bad audio.
 

Dan203

Senior Developer
Staff member
The audio volume can be adjusted in the main UI if it's too loud. Or you can set the gain in the profile.

The video quality I'm not sure about 6Mbps should be plenty. The video is short so if you really want you could bump the average bitrate to 9000 and see if that helps. The DVD dialog adjust the bitrate automatically to the max that will allow the video to fit, so the other DVDs you made might have had a higher bitrate.
 

Quest

New member
Dan,

I accidentally stumbled on something odd, I did a short capture and did a small edit on it in VRD then just saved it with the default settings.
I went to play the saved .mpg with windows media player and it played the audio with no video, I then tried to play it with VLC media player and it played the video but like my other captures the audio is just a loud static hiss.
I just thought it was odd that windows media player was able to play the audio!
I was under the impression that VRD was not outputting a valid audio signal but it obviously is.

EDIT:

The machine I used to capture and tried to play the .mpg on was a Windows 8 machine with the latest version of windows media player, out of curiosity I tried to play it on an XP machine that has Media player classic and it worked!
I then tried playing it with windows media player 11 and it played just fine!
After that being even more curious I decided to try uploading the .mpg to youtube and sure enough it plays just fine.

So I tried burning the .mpg to DVD with VRD and sure enough It plays just fine!

I'm doing more testing now to figure out where the problem occurs but it seems it has something to do with the step where I save the .avi as .mpg then burn it to disc that makes the disc work even though the .mpg won't play in the latest windows media player, and if I don't save the .avi as .mpg and just try burning the .avi I get the corrupt audio on disc.

Does any of this make sense to you???
 
Last edited:

Dan203

Senior Developer
Staff member
24 bit PCM audio is stored weirdly for MPG files, just like for DVDs, so most players probably won't be able to play those files. You really should convert to 16 bit like I suggested in my original post. It will really increase compatibility.
 

klimbo

New member
Is there a specific program I should use to get this info?
I used one and it spit out the following:

ID : 1
Format : PCM
Format settings : Little / Signed
Codec ID : 00000001-0000-0010-8000-00AA00389B71
Duration : 51 min 20 s
Bit rate mode : Constant
Bit rate : 2 304 kb/s
Channel(s) : 2 channels
Sampling rate : 48.0 kHz
Bit depth : 24 bits
Stream size : 846 MiB (1%)
Alignment : Aligned on interleaves
Interleave, duration
Tutuapp 9apps Showbox : 1034 ms (31.00 video frames)
are you sur the duration is : 1034 ms (31.00 video frames) ? i think this is very short duration
 
Last edited:
Top Bottom