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!
Audio Crackling
Re: Audio Crackling
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.
Re: Audio Crackling
Thanks Carl. A great program and a real life saver for us at a small community run cinema in Victoria, Australia.
Peter.
Peter.
Re: Audio Crackling
I'm hearing a popping/crackle in the louder sections of my short film's DCP when played in DCP Player as well. I don't have access to Q&C in theater, and want to clarify: Are you saying this crackle is only present when played on DCP-o-Matic Player and is not heard when played in theaters?
Re: Audio Crackling
I guess we need to get access to one of these audio files to see wether it is clipping or some sort of scrambling.
Re: Audio Crackling
Would that be the original sound files used to make the DCP or one of the mxf or xml files in the DCP?
Re: Audio Crackling
The audio mxf from the DCP. How long/large is the file?
One could load it into e.g. audacity and trim to parts where the crackling occurs, if it's too large. But you could also just convert a shorter area by trimming content in DCP-o-matic.
One could load it into e.g. audacity and trim to parts where the crackling occurs, if it's too large. But you could also just convert a shorter area by trimming content in DCP-o-matic.