AcePlayer (iPhone) : fast forward doesn't works

Hello,
I can't set time position in any video when I use AcePlayer from my iPhone.
The video read perfectly but I've to restart from begin if I stop my video.
All worked fine with AcePlayer and minidlna, I've tried different transcoding but the problem persist.
Is it a Serviio limitation ? What can I check to find what's the problem ?
Thanks for your help.

I've just found this in my log :
2013-01-02 00:00:18,792 ERROR [MediaServer] FFMPEG not found. Serviio will not work properly.

Here is the complete log :

  Code:

2013-01-02 00:00:00,686 INFO  [MediaServer] ------------------------------------------------------------------------
2013-01-02 00:00:00,687 INFO  [MediaServer] Serviio DLNA media streaming server v 1.1 (rev. 6ba0dd933a8e+)
2013-01-02 00:00:00,687 INFO  [MediaServer] Petr Nejedly 2009-2012
2013-01-02 00:00:00,687 INFO  [MediaServer] http://www.serviio.org
2013-01-02 00:00:00,687 INFO  [MediaServer]
2013-01-02 00:00:00,687 INFO  [MediaServer] Java 1.6.0_24-Sun Microsystems Inc.
2013-01-02 00:00:00,688 INFO  [MediaServer] OS Linux i386 3.2.0-35-generic-pae
2013-01-02 00:00:00,688 INFO  [MediaServer] File encoding: UTF-8
2013-01-02 00:00:00,688 INFO  [MediaServer] Headless mode enabled: true
2013-01-02 00:00:00,688 INFO  [MediaServer] User: root
2013-01-02 00:00:00,688 INFO  [MediaServer] User home dir: /root
2013-01-02 00:00:00,688 INFO  [MediaServer] Temp dir: /tmp
2013-01-02 00:00:00,688 INFO  [MediaServer] ------------------------------------------------------------------------
2013-01-02 00:00:01,051 INFO  [WebServer] Socket buffer set to 65535 bytes
2013-01-02 00:00:01,053 INFO  [RestletServer] Starting Restlet server (/rest) exposed on port 23423
2013-01-02 00:00:01,164 INFO  [RestletServer] Starting Restlet server (/cds) exposed on port 23424
2013-01-02 00:00:01,165 INFO  [RestletServer] Starting Restlet server (/mediabrowser) exposed on port 23424
2013-01-02 00:00:01,184 INFO  [DBSchemaUpdateExecutor] Checking if DB schema needs to be updated
2013-01-02 00:00:03,413 INFO  [Device] Created UPnP Device with UUID: 2819bbb6-4c66-3f22-b524-bb975bbf9a42, bound address: 192.168.0.200
2013-01-02 00:00:03,993 INFO  [MediaServer] ------------------------------------------------------------------------
2013-01-02 00:00:03,993 INFO  [MediaServer] License: PRO (EVALUATION, id: 11111111-1111-1111-1111-111111111113)
2013-01-02 00:00:03,993 INFO  [MediaServer] ------------------------------------------------------------------------
2013-01-02 00:00:05,119 INFO  [ProfilesDefinitionParser] Parsing Profiles definition
2013-01-02 00:00:06,689 INFO  [ProfilesDefinitionParser] Added profile 'Generic DLNA profile' (id=1)
2013-01-02 00:00:07,178 INFO  [ProfilesDefinitionParser] Added profile 'Samsung TV (B-series)' (id=2)
2013-01-02 00:00:07,641 INFO  [ProfilesDefinitionParser] Added profile 'Xbox 360' (id=3)
2013-01-02 00:00:08,271 INFO  [ProfilesDefinitionParser] Added profile 'Playstation 3' (id=4)
2013-01-02 00:00:08,643 INFO  [ProfilesDefinitionParser] Added profile 'Samsung TV (A-series)' (id=5)
2013-01-02 00:00:09,012 INFO  [ProfilesDefinitionParser] Added profile 'DirecTV HD-DVR' (id=6)
2013-01-02 00:00:09,751 INFO  [ProfilesDefinitionParser] Added profile 'Samsung TV / player (C/D/E-series)' (id=7)
2013-01-02 00:00:09,794 INFO  [ProfilesDefinitionParser] Added profile 'LG TV / player' (id=8)
2013-01-02 00:00:10,822 INFO  [ProfilesDefinitionParser] Added profile 'Sony Bravia TV (2012)' (id=sony2012)
2013-01-02 00:00:11,909 INFO  [ProfilesDefinitionParser] Added profile 'Sony BD Player / SMP' (id=10)
2013-01-02 00:00:12,475 INFO  [ProfilesDefinitionParser] Added profile 'Toshiba REGZA' (id=13)
2013-01-02 00:00:12,964 INFO  [ProfilesDefinitionParser] Added profile 'WDTV Live' (id=14)
2013-01-02 00:00:13,029 INFO  [ProfilesDefinitionParser] Added profile 'LaCie LaCinema Media Player' (id=15)
2013-01-02 00:00:13,314 INFO  [ProfilesDefinitionParser] Added profile 'Manta WIFI Centre' (id=16)
2013-01-02 00:00:13,430 INFO  [ProfilesDefinitionParser] Added profile 'Pure Flow' (id=17)
2013-01-02 00:00:14,014 INFO  [ProfilesDefinitionParser] Added profile 'Sharp Aquos' (id=18)
2013-01-02 00:00:14,260 INFO  [ProfilesDefinitionParser] Added profile 'Sony Bravia TV (2011)' (id=sony2011)
2013-01-02 00:00:14,884 INFO  [ProfilesDefinitionParser] Added profile 'Sony Bravia TV (2010)' (id=sony2010)
2013-01-02 00:00:15,348 INFO  [ProfilesDefinitionParser] Added profile 'Philips' (id=20)
2013-01-02 00:00:15,483 INFO  [ProfilesDefinitionParser] Added profile 'Sony Bravia TV (2009)' (id=sony2009)
2013-01-02 00:00:15,552 INFO  [ProfilesDefinitionParser] Added profile 'Denon AVR' (id=22)
2013-01-02 00:00:16,286 INFO  [ProfilesDefinitionParser] Added profile 'Panasonic Viera G/GT/DT/UT/VT (2011/2012)' (id=viera2011a)
2013-01-02 00:00:16,375 INFO  [ProfilesDefinitionParser] Added profile 'Panasonic Viera E/S/ST/VT (2011)' (id=viera2011)
2013-01-02 00:00:16,478 INFO  [ProfilesDefinitionParser] Added profile 'Panasonic Viera (2010)' (id=viera2010)
2013-01-02 00:00:16,662 INFO  [ProfilesDefinitionParser] Added profile 'Sony Bravia TV (2012) - US' (id=sony2012us)
2013-01-02 00:00:16,890 INFO  [ProfilesDefinitionParser] Added profile 'Sony Bravia TV (2011) - US' (id=sony2011us)
2013-01-02 00:00:17,198 INFO  [ProfilesDefinitionParser] Added profile 'Sony AVReceiver STR' (id=SonySTR)
2013-01-02 00:00:17,372 INFO  [ProfilesDefinitionParser] Added profile 'Sony Audio CMT' (id=SonyCMT)
2013-01-02 00:00:17,700 INFO  [ProfilesDefinitionParser] Added profile 'iPhone' (id=iPhone)
2013-01-02 00:00:17,805 INFO  [ProfilesDefinitionParser] Parsing Profiles definition
2013-01-02 00:00:18,275 INFO  [ProfilesDefinitionParser] Added profile 'Flash player' (id=flv_player)
2013-01-02 00:00:18,465 INFO  [ProfilesDefinitionParser] Added profile 'ServiiGo' (id=serviigo)
2013-01-02 00:00:18,618 INFO  [ProfilesDefinitionParser] Added profile 'Windows Phone 8' (id=wp8)
2013-01-02 00:00:18,662 INFO  [PluginCompilerThread] Looking for plugins at /opt/serviio-1.1/plugins
2013-01-02 00:00:18,664 INFO  [PluginCompilerThread] Started looking for plugins
2013-01-02 00:00:18,677 INFO  [UpdateChecker] Checking if a new version is available
2013-01-02 00:00:18,792 ERROR [MediaServer] FFMPEG not found. Serviio will not work properly.
2013-01-02 00:00:18,814 ERROR [ProcessExecutor] Fatal error in process starting: Cannot run program "dcraw": java.io.IOException: error=2, No such file or directory
2013-01-02 00:00:18,815 WARN  [MediaServer] DCRAW not found. Support for raw image files will be missing.
2013-01-02 00:00:18,837 INFO  [AbstractTranscodingDeliveryEngine] Cleaning transcode engine and its data
2013-01-02 00:00:18,873 INFO  [WebServer] WebServer starting on port 8895
2013-01-02 00:00:18,877 INFO  [EventSubscriptionExpirationChecker] Starting EventSubscriptionExpirationChecker
2013-01-02 00:00:18,878 INFO  [EventDispatcher] Starting EventDispatcher
2013-01-02 00:00:18,882 INFO  [DiscoverySSDPMessageListener] Starting DiscoverySSDPMessageListener using interface eth0 (eth0) and address 192.168.0.200, timeout = 0
2013-01-02 00:00:18,885 INFO  [DiscoveryAdvertisementNotifier] Starting DiscoveryAdvertisementNotifier
2013-01-02 00:00:18,887 INFO  [RendererSearchSender] Searching for Renderer devices, will multicast on 1 NICs
2013-01-02 00:00:18,888 INFO  [RendererExpirationChecker] Starting RendererExpirationChecker
2013-01-02 00:00:22,036 INFO  [ContentDirectoryDefinitionParser] Parsing ContentDirectory definition
2013-01-02 00:00:23,091 INFO  [BrowsingCategoriesMessages] Loaded browsing categories message bundle for locale: fr



Could it be the cause of the problem ?
ffmpeg is installed and Ive just seen this post which specify to install ffmpeg from another source : viewtopic.php?f=5&t=8598
Is there any other solution or bugfix ?
Thanks for helps