[asterisk-bugs] [JIRA] (ASTERISK-16376) Record files with noise and/or audio cutting when using mixmonitor with medium call trafic on Asterisk.

[Marco Aurelio (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-16376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=206014#comment-206014 ] 

Marco Aurelio commented on ASTERISK-16376:
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At this moment, the same issue still happening. As a workaround we changed to “.wav” (non compressed) format. The problem was reduced, and the audio quality increased a lot, but in some cases still occurs a lack (0.5, 1 second) of audio.
We are using a very fast disk to generate de audio files, so I can guarantee that is not I/O bottleneck.
Also made TCPDUMP at server and client, trying to find a problem at the client, switches or server network, but the audio captured by Wireshark is always fine, while the same conversation recorded on asterisk presents audio drops.
Attached an example of audio drop in an uncompressed file recorded by mixmonitor app (12_seconds.wav).

                
> Record files with noise and/or audio cutting when using mixmonitor with medium call trafic on Asterisk.
> -------------------------------------------------------------------------------------------------------
>
>                 Key: ASTERISK-16376
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-16376
>             Project: Asterisk
>          Issue Type: Bug
>          Components: Applications/app_mixmonitor
>            Reporter: Marco Aurelio
>            Severity: Minor
>         Attachments: 0101000029023770833.WAV, 12_seconds.WAV, 99727.WAV, configs.txt, performance.png, scenario.jpg
>
>
> When recording with mixmonitor, all record files gets with noise an cuts on the audio.
> The scenario was:
> - Medium call traffic: More than 60 and less than 120 concurrent calls.
> - All calls are recorded
> - Codec: Alaw
> - Record File format: GSM
> - Processor load: Never more than 50%
> - Asterisk Version: 1.6.1.11
> - SO Debian 5.0.3 - 2.6.26-2-686
> ****** ADDITIONAL INFORMATION ******
> - The call always stay clean, even when monitoring using chanspy.
> - When tryed the same scenario recording WAV format, the record file stay clean.
> - When tryed recording GSM format with no call trafic, the record file stay clean.
> - Also realized the same problem at another customers, with different hardware and Asterisk version.

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