TC-L55ET5: mkv work but no other file type,transcoding probl

I can play .mkv without any problem. But i'm unable to play any other video file.
Here is an example:
media@mediastation:~$ ffmpeg -i /data/Films/Rambo\ 1.avi
ffmpeg version 0.8.4-4:0.8.4-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the Libav developers
built on Nov 6 2012 16:51:33 with gcc 4.6.3
*** THIS PROGRAM IS DEPRECATED ***
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
Seems stream 0 codec frame rate differs from container frame rate: 2.00 (2/1) -> 25.00 (25/1)
Input #0, avi, from '/data/Films/Rambo 1.avi':
Duration: 01:29:20.16, start: 0.000000, bitrate: 1093 kb/s
Stream #0.0: Video: mpeg4, yuv420p, 720x400 [PAR 1:1 DAR 9:5], 25 fps, 25 tbr, 25 tbn, 2 tbc
Metadata:
title : NeoVideo92CF
Stream #0.1: Audio: mp3, 48000 Hz, stereo, s16, 96 kb/s
Metadata:
title : NeoSound92CF0
At least one output file must be specified
Here is the log details:
2012-12-11 00:10:30,707 DEBUG [RendererDAOImpl] Reading a Renderer with ip address 192.168.1.134
2012-12-11 00:10:30,711 DEBUG [DeviceDescriptionRequestHandler] Sending DeviceDescription XML back using profile 'Panasonic Viera E/S
/ST/VT (2011)'
2012-12-11 00:10:31,562 DEBUG [WebServer] Incoming connection from /192.168.1.134:10286
2012-12-11 00:10:31,563 DEBUG [RendererDAOImpl] Reading a Renderer with ip address 192.168.1.134
2012-12-11 00:10:31,564 DEBUG [ResourceTransportRequestHandler] GET /resource/5/MEDIA_ITEM/MPEG_TS_SD_NA_ISO-0/ORIGINAL HTTP/1.1, headers = [Host: 192.168.1.3:8895,TimeSeekRange.dlna.org: npt=00:00:00.000-,transferMode.dlna.org: Streaming,Connection: keep-alive]]
2012-12-11 00:10:31,564 DEBUG [RendererDAOImpl] Reading a Renderer with ip address 192.168.1.134
2012-12-11 00:10:31,565 DEBUG [ResourceDeliveryProcessor] Resource request accepted. Using client 'IPAddress=/192.168.1.134, Profile=Panasonic Viera E/S/ST/VT (2011)'
2012-12-11 00:10:31,566 DEBUG [ResourceDeliveryProcessor] Request for resource 5 and type 'MEDIA_ITEM' received
2012-12-11 00:10:31,566 DEBUG [MediaResourceRetrievalStrategy] Getting information about media item 5 (local)
2012-12-11 00:10:31,566 DEBUG [MediaItemDAOImpl] Reading a MediaItem (id = 5)
2012-12-11 00:10:31,567 DEBUG [VideoDAOImpl] Reading a Video (id = 5)
2012-12-11 00:10:31,568 DEBUG [VideoDeliveryEngine] Delivering item '5' for client 'IPAddress=/192.168.1.134, Profile=Panasonic Viera E/S/ST/VT (2011)'
2012-12-11 00:10:31,568 DEBUG [VideoDeliveryEngine] Delivering file 'Rambo 1.avi' using transcoding
2012-12-11 00:10:31,568 DEBUG [AbstractTranscodingDeliveryEngine] A suitable transcoding job already exists, re-use it for client 'IPAddress=/192.168.1.134, Profile=Panasonic Viera E/S/ST/VT (2011)'
2012-12-11 00:10:31,569 ERROR [ResourceTransportRequestHandler] Error while processing resource, sending back 500 error. Message: Transcoded file '/tmp/Serviio/transcoding-temp-5-viera2011-ORIGINAL.stf' cannot be found, FFmpeg execution probably failed
java.io.IOException: Transcoded file '/tmp/Serviio/transcoding-temp-5-viera2011-ORIGINAL.stf' cannot be found, FFmpeg execution probably failed
at org.serviio.delivery.resource.transcode.FileBasedTranscodingDeliveryStrategy.createInputStream(FileBasedTranscodingDeliveryStrategy.java:45)
at org.serviio.delivery.resource.transcode.AbstractTranscodingDeliveryEngine.retrieveTranscodedResource(AbstractTranscodingDeliveryEngine.java:125)
at org.serviio.delivery.resource.AbstractDeliveryEngine.deliver(AbstractDeliveryEngine.java:95)
at org.serviio.delivery.MediaResourceRetrievalStrategy.retrieveResource(MediaResourceRetrievalStrategy.java:120)
at org.serviio.delivery.ResourceDeliveryProcessor.deliverContent(ResourceDeliveryProcessor.java:84)
at org.serviio.upnp.webserver.ResourceTransportRequestHandler.handleRequest(ResourceTransportRequestHandler.java:79)
at org.serviio.upnp.webserver.AbstractRequestHandler.handle(AbstractRequestHandler.java:61)
at org.apache.http.protocol.HttpService.doService(HttpService.java:293)
at org.serviio.upnp.webserver.ServiioHttpService.doService(ServiioHttpService.java:58)
at org.apache.http.protocol.HttpService.handleRequest(HttpService.java:212)
at org.serviio.upnp.webserver.WebServer$WorkerThread.run(WebServer.java:191)
I suspect ffmpeg transcoding doesn't work at all on my server.. Any help will be appreciated!
