# AMF Exception

**URL:** <https://community.wowza.com/t/amf-exception/198>\
**Category:** Wowza Streaming Engine\
**Created:** [November 27, 2014, 11:58pm UTC](https://community.wowza.com/t/amf-exception/198 "2014-11-27T23:58:37Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![system](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/system/32/447_2.png) [@system](https://community.wowza.com/u/system)\
**Post date:** [November 27, 2014, 11:58pm UTC](https://community.wowza.com/t/amf-exception/198/1 "2014-11-27T23:58:37Z")

</div>

Hello, just for feedback

i had a pretty big videoconferencing session today (about 1000 people connected to the same app instance), and i noticed this error in the logs:

```auto
constructor AMFDataObj(ByteBuffer)[70:86] : java.io.UTFDataFormatException: malformed input around byte 0|at com.wowza.wms.amf.AMF3Utils.deserializeString(AMF3Utils.java:286)|at com.wowza.wms.amf.AMF3Utils.deserializeString(AMF3Utils.java:193)|at com.wowza.wms.amf.AMFDataItem.deserialize(AMFDataItem.java:401)|at com.wowza.wms.amf.AMFDataItem.<init>(AMFDataItem.java:176)|at com.wowza.wms.amf.AMFData.deserializeInnerObject(AMFData.java:340)| 

```

i wasn’t there during the session, so i don’t know if it had consequences.

update: i got some feedback and apparently from that moment the sound became unstable and shutdown, and the sharedObjects gone mad (using particularly the textchat module)

forgot to mention spec:

ubuntu 14.10

8 core 3.9ghz

64Gb RAM

Wowza 4.10

500mbps bandwidth/1gbps burst

encoder: flashplayer rtmp

from the manager:

OS Architecture

amd64

Memory

Total: 62,95 GB

Available: 58,76 GB

Processor Cores

8

Java Version

1.8.0\_40-internal

Java Bitness

64

```auto
Java Heap Size
Production level
10000 MB
Java Garbage Collection Settings
Concurrent collector (recommended)
-XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:NewSize=512m

```

```auto
Handler Thread Pool Size
Set automatically to: 480 threads
Transport Thread Pool Size
Set automatically to: 320 threads

```

```auto
Writer Thread Pool
Set automatically to: 16 threads
Readahead Thread Pool
Set automatically to: 16 threads
Maximum Pending Write Request Size
Set automatically to: 500 MB
Maximum Pending Readahead Request Size
Set automatically to: 25 MB

```

```auto
Net Connections Processor Count
Set automatically to: 32 threads
Media Caster Processor Count
Set automatically to: 32 threads
Idle Worker Count
Set automatically to: 16 threads
Unicast Incoming Processor Count
Set automatically to: 16 threads
Unicast Outgoing Processor Count
Set automatically to: 16 threads
Multicast Incoming Processor Count
Set automatically to: 16 threads
Multicast Outgoing Processor Count
Set automatically to: 16 threads
Client Idle Frequency
250 milliseconds
RTP Idle Frequency
75 milliseconds

```

```auto
Default Streaming ( * : 80,443,1935 )
Processor Count
Set automatically to: 16 threads
Default Admin ( * : 8086 )
Processor Count
Set automatically to: 4 threads

```

```auto
Handler Thread Pool Size
Use Server Settings
Transport Thread Pool Size
Use Server Settings

```

thx

---

<div class="post-metadata">

**Author:** ![gabriel\_fg](https://avatars.discourse-cdn.com/v4/letter/g/a183cd/32.png) [@gabriel\_fg](https://community.wowza.com/u/gabriel_fg)\
**Post date:** [November 30, 2014, 5:23am UTC](https://community.wowza.com/t/amf-exception/198/2 "2014-11-30T05:23:44Z")

</div>

up ?