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Can badly clipping audio affect video quality?
I recently had to cover a wedding engagement party for a friend. I was getting sound wirelessly from an RCA feed from the DJ into a radio mic I had mounted on my Z1P. As backup, I was also running a shotgun mic on the other XLR input. I was recording into separate channels. The first part of the night was OK. Later, during all the dancing, I took off my head phones so I could move freely, and at some point the DJ must have cranked up my feed by accident. As my levels were set manually, automatic audio gain and limiting did not kick in.
Now, when played back through the camera, the DJ’s channel is clipping badly, but the backup shotgun mic audio channel is OK. Listening with headphones on camera afterwards confirmed it was OK.
When capturing into Vegas, I monitored the audio and video through headphones. The clipping was present on the ‘DJ’ channel, but the other channel was OK. The video coming through the capture preview was OK.
When imported onto the time line, the fun begins. The audio stutters and clips badly regardless of whether I select both, left or right channels. By stuttering, I mean the audio is punctuated with pauses and distorts. Strangely, the video is now also distorted with digital noise, like bad digital TV reception during a storm.
3 questions:
1) Why is the clipping affecting both channels when I have recorded to left and right separately?
2) Can badly clipping audio affect video?
3) I decided to put a noise filter on the audio track, but it introduced the occasional high pitched squeak. I took it off but the squeaking and noise filter suppression remains. What the?I thought this might have been an issue with Vegas 10.0a so I updated to 10c, with no visible or audible improvement.
I did a recapture using another camera. No difference.
Any suggestions as to what is going on? Is it Vegas?
Intel i7 920, 12GB RAM, ASUS P6T, Vegas Pro 10 (x32/x64), Windows 7 x64 Ultimate, Vegas Production Assistant 1.0, VASST Ultimate S Pro 4.1, Neat Video Pro 2.6
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3 Replies
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Restarted the PC several times, restarted Vegas several times, and the problem has vanished. I am stumped, but given the lack of a repeatable problem, I guess there is nothing to solve!
Intel i7 920, 12GB RAM, ASUS P6T, Vegas Pro 10 (x32/x64), Windows 7 x64 Ultimate, Vegas Production Assistant 1.0, VASST Ultimate S Pro 4.1, Neat Video Pro 2.6
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The problem is still occurring and is fixed by restarts/reboots. It also effects the renders in the same way. I have reported it to Sony.
Intel i7 920, 12GB RAM, ASUS P6T, Vegas Pro 10 (x32/x64), Windows 7 x64 Ultimate, Vegas Production Assistant 1.0, VASST Ultimate S Pro 4.1, Neat Video Pro 2.6
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