rendered audio is distorted

dennis4bluray wrote on 8/2/2015, 5:57 PM
I have a standard definition project consisting of many separate video clips from 25 years. I have adjusted all the audio levels to be way below distortion level. when I play the project back while in editing mode the audio seems to be clean and not distorted. after rendering and playing back on a dvd on my tv set I get distortion on many of the audio clips. I have added music to the final project in different areas and that doesn't seem to be distorted. my render settings are, stereo mode, audio layer 2, 224 bit rate and sample rate 48,000
do I need to change any render settings to help the distortion issue?
thanks

Comments

musicvid10 wrote on 8/2/2015, 7:33 PM
That's your whole problem.
Render a separate DVD Architect Dolby AC3 Audio Stream, and a separate DVD Architect Video Stream.
Instructions for doing so abound on these forums and Knowledgebase Article #84.
Former user wrote on 8/2/2015, 8:50 PM
To expand on MV10 response, the audio that is created with your settings is not standard DVD audio. Some players will use it with no problems, others might not.

The best practice is to create two files. A video file and separate audio file (either AC3 or WAV). If you give each file the same name and save to the same folder. DVDA will import both files when you import the video file.

This should fix your problem, but let us know if it doesn't.
musicvid10 wrote on 8/3/2015, 6:56 AM
Actually, the embedded Mpeg 1 Layer II ("mp2") audio track was how all DVDs were burned in the 1990s. Horrible compression artifacts, high frequency loss, inflexible audio track choices, and of course no surround.

But that was then. There is simply no good reason to do that now . . .
dennis4bluray wrote on 8/4/2015, 12:13 AM
thanks, I worked through your audio instructions and finally made a copy
however, I still got distortion, so I went back to the original clips and the audio was distorting a little. I tried rendering a clip with reduced volume and then render in DVD architect, and still got distortion. so I think that any small distortion increases in value as each time it is rendered to a new file.
also, I rendered the full volume clip and it had the least distortion on playback, but the clip would be too loud for the story line if I kept it at full volume.
are there any other ideas about how to achieve minimum distortion from a clip
Chienworks wrote on 8/4/2015, 6:32 AM
Are you using any volume controls, effects (EQ, Reverb) or processing (compression) that adds volume? Rendering itself is a unity gain process that will NOT increase the volume nor cause distortion. However, if you have anything added that does increase the volume, then these increases will be in the rendered file. If your increase causes the output to go above 0dB then you will get distortion.

If you haven't added anything that increases the volume then you can render infinite generations without any added distortion.
musicvid10 wrote on 8/4/2015, 7:06 AM
Sounds like your audio source is distorted or clipped.
Very little you can do about that, sorry.
dennis4bluray wrote on 8/4/2015, 6:43 PM
thanks guys
yes, the original source is clipped slightly
however, when playing back the original clip I hear a little distortion, but I can make out the words.
I do not add any volume, in fact I reduce the volume to match the levels of other lower volume clips on the time line.
it seems that after rendering, the distortion is really noticeable, as if the clipping is enhanced by rendering.
as I said before I tried just working with the clip in a separate timeline and experimenting lowering the volume and rendering separately
I think I may be over a barrel
EricLNZ wrote on 8/4/2015, 9:23 PM
Dennis, are you comparing apples with apples? Presumably you are listening to your source on preview on your pc. Are you also listening to your rendered output on your pc?
dennis4bluray wrote on 8/10/2015, 6:45 PM
good point, apples and oranges
listening to pre render audio on pc and post render on a dvd playing on the tv system