clicking noise at the end of some dcp

[GoogleCodeExporter]

What steps will reproduce the problem?
1.converted clean wave (stereo) to mxf with opendcp
2.if Iplay the DCP on a Doremi there is some short clicking noise / random 
noise at the end.

What is the expected output? What do you see instead?
clicking noise / random noise at the end

What version of the product are you using? On what operating system?
opendcp-0.0.26-windows.x86_64.exe, windows 7 64 bit

Please provide any additional information below.
If play the mxf file in vlc player, there is also the clicking noise / random 
noise at the end of the track. The exported Wave File was clean. I also tried 
to add a pause with 2 seconds at the end of the wave file, but still some 
clicking noise / random noise at the end of the mxf file.

I converted the mxf back to wave file, to check the spectrum, but there is 
nothing changed at the end of the wave file.

Any idea?

Original issue reported on code.google.com by Dominik.Eisele on 6 Jun 2012 at 8:19

[GoogleCodeExporter]

Added WAV File with clicking noise / random noise at the end.
Also added JPEG showing the  clicking noise / random noise at the end in wave 
editor.

Original comment by Dominik.Eisele on 6 Jun 2012 at 8:33

Attachments:

• [random noise.wav](https://storage.googleapis.com/google-code-attachments/opendcp/issue-118/comment-1/random noise.wav)
• [random noise.jpg](https://storage.googleapis.com/google-code-attachments/opendcp/issue-118/comment-1/random noise.jpg)

[GoogleCodeExporter]

Are you using mono-wav files to build the MXF? Please upload the original wav 
file when you can. I have not seen this before.

Original comment by terrenc...@gmail.com on 6 Jun 2012 at 9:18

[GoogleCodeExporter]

sure, using Mono Wave files with 24bit 48KHz, modified with Adobe Audition
cs5.5. The Original File was 16biz 44,1 KHz, so I have to adjust it, and Splitt 
it to two Mono Files.

Which file do you Need to analyze?

I can Upload the Files to dropbox, If you want, and send you the Download link 
by Email.
During Copyright and File Size issues, I cant Upload it here.

Thank you

Regards

Dominik

Original comment by Dominik.Eisele on 7 Jun 2012 at 2:17

[GoogleCodeExporter]

Sure, upload the two wav files you input into opendcp (the 24-bit, 48khz mono 
versions) to dropbox. Have you seen this with other wav files?

Original comment by terrenc...@gmail.com on 7 Jun 2012 at 3:41

[GoogleCodeExporter]

I have also seen this with other DCPs, maybe the exported adobe audition audio 
format is the problem. I have also converted the original stereo file with 
audacity for windows, and there is no clicking noise / random noise at the end, 
for the first try.

I have uploaded the two verions auf the audio file:
Exported Adobe audition Files:
KaO12 Filmtrailer zu Beginn_neu_R.wav
KaO12 Filmtrailer zu Beginn_neu_L.wav

Exported audacity Files:
KaO12 Filmtrailer zu Beginn_neu_07062012_L.wav
KaO12 Filmtrailer zu Beginn_neu_07062012_R.wav

Download Linke sent by email to you.

Original comment by Dominik.Eisele on 7 Jun 2012 at 10:34

[GoogleCodeExporter]

[deleted comment]

[GoogleCodeExporter]

We had the same issue with Audition, it happens if you add metainfos to the wav 
files you are saving. Not quite sure, if stereo only and/or 5.1 and not quite 
sure if interop and/or smpte mxfs generated by opendcp had this issues... sorry 
for responding so late, had forgotten about this issue and just saw this thread.

Saving wavs in Audition without metadata maybe conflicts with this requirement 
from the DCI - not quite sure: "3.3.4.2. Synchronization
The Broadcast Wave (.wav) file is required to contain metadata that indicates 
the first sample of audio data. The metadata is also required to contain a 
continuous frame count relative to the image as well as the sample rate." Page 
34

Full document: http://www.dcimovies.com/DCIDigitalCinemaSystemSpecv1_2.pdf

Regards

Alexis

Original comment by ale...@dcpmanufaktur.de on 17 Jun 2012 at 11:04

[GoogleCodeExporter]

I'm getting a very strange sounding audio .mxf file.  Original mono .wav (24bit 
/ 48khz) sound fine.  Once OpenDCP does it's thing and creates the .mxf, the 
audio sound almost an octave lower and seems to be running slower, however it 
is still the original length.  HELP!

Original comment by mfoxprod...@gmail.com on 16 Sep 2012 at 5:05

[GoogleCodeExporter]

Most likely your file is stereo, not true mono. Some software will store mono 
wavs as 2 channels, with the sound in the left and silence in the right. 

Original comment by terrenc...@gmail.com on 16 Sep 2012 at 1:08

[GoogleCodeExporter]

This is definitely due to some meta-data. Had exactly same issue. Wavs were 
exported from ProTools - played perfectly in ProTools and AIMP (mp3 player). 
But after converting to DCP - some distortion click in the end.

Run all files through SOX with following key:

sox %1 -r 48k -b 24 %2.n.wav (%1 input file, %2 output file)

file size changed from 3 902 008 to 3 762 300

recreated MXF and DCP - and distortion gone.

Hope that helps.

Original comment by deral...@gmail.com on 11 Mar 2013 at 11:13

[GoogleCodeExporter]

I figured it out, reducing the frame numbers in the DCP panel.
In my case the total duration was 987 and I reduced to 980, even if the click 
wasn't on my original audio track
Hope this helps.

matteo

Original comment by matteo.m...@gmail.com on 15 Mar 2013 at 12:23

[GoogleCodeExporter]

Saving all waves without metadatas is the solution always. Audition, 
protools... anything program save the waves without metadatas.

Regards!

Original comment by al.diazl...@gmail.com on 10 Apr 2013 at 3:48

[GoogleCodeExporter]

Closing as non OpenDCP issue. 

Original comment by terrenc...@gmail.com on 30 Jul 2013 at 3:06

• Changed state: NotReproduced