Audio Crackling

Anything and everything to do with DCP-o-matic.
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swanpool
Posts: 7
Joined: Tue Dec 03, 2013 12:44 pm

Audio Crackling

Post by swanpool »

I recently converted a Brain Farm Digital Cinema Reel 2012 from Vimeo to a DCP using DVD O Matic and found sections of the audio had a distinct crackle which was not in the original mp4 download.

After checking the DVD and DCP O Matic websites I re-encoded the file with the Audio gain set to -12db. This has eliminated the crackle.

However the crackle does not appear to be created by our cinema system which is a Barco 10s projector, Dolby DDSS220 Server/IMB and 7.1 Dolby CP750.

Rather the original crackle was present in the DCP when it was played using dcpPlayer on a PC. The cinema system was merely reproducing the DCP audio.

Crackling audio therefore appears to be an artifact of the DCP conversion process rather than the cinema audio system!

Is this a valid interpretation of what is occurring!

carl
Site Admin
Posts: 1179
Joined: Thu Nov 14, 2013 2:53 pm

Re: Audio Crackling

Post by carl »

Yes. If the audio level is too high it is clipped in the DCP's audio files, so it will sound nasty no matter what you play it back on.

swanpool
Posts: 7
Joined: Tue Dec 03, 2013 12:44 pm

Re: Audio Crackling

Post by swanpool »

Thanks Carl. A great program and a real life saver for us at a small community run cinema in Victoria, Australia.
Peter.

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