Podcast playback: Unable to estimate transcoded size

[knopperhopper]

Hi,
i am really happy with subsonic, but i cann not work around one problem. I listen to a dj-set from above and beyond as itunes podcast (http://static.aboveandbeyond.nu/grouptherapy/podcast.xml)
the files are successfully downloaded and work when i acces them with a local player (e.g vlc) but if i want to stream it - nothing happens
<-------------------------Subsonic Help Request---------------------->
Problem Description: I listen to a dj-live set from above and beyond as itunes podcast (http://static.aboveandbeyond.nu/grouptherapy/podcast.xml)
the files are downloaded and work when i acces them with alocal player (e.g vlc) but if i want to stream it - nothing happens
this are the log entries:
[1/17/15 3:04:01 PM CET] WARN JaudiotaggerParser Error when parsing tags in /media/music/podcasts/Above & Beyond- Group Therapy/ABGT113_356636.m4a
[1/17/15 3:10:15 PM CET] INFO PlayQueueInputStream admin listening to "Handwritten (Deluxe Version)/01 _45_.m4a"
[1/17/15 3:10:15 PM CET] DEBUG TranscodeInputStream Starting transcoder: [/var/subsonic/transcode/ffmpeg] [-i] [/media/music/The Gaslight Anthem/Handwritten (Deluxe Version)/01 _45_.m4a] [-map] [0:0] [-b:a] [128k] [-v] [0] [-f] [mp3] [-]
[1/17/15 3:10:41 PM CET] WARN JaudiotaggerParser Error when parsing tags in /media/music/podcasts/Above & Beyond- Group Therapy/ABGT112_533646.m4a
[1/17/15 3:10:41 PM CET] WARN JaudiotaggerParser Failed to find cover art tag in ABGT112_533646
[1/17/15 3:10:41 PM CET] WARN StreamController Unknown duration for ABGT113_356636. Unable to estimate transcoded size.
[1/17/15 3:10:41 PM CET] INFO PlayQueueInputStream admin listening to "Above & Beyond- Group Therapy/ABGT113_356636.m4a"
[1/17/15 3:10:41 PM CET] DEBUG TranscodeInputStream Starting transcoder: [/var/subsonic/transcode/ffmpeg] [-i] [/media/music/podcasts/Above & Beyond- Group Therapy/ABGT113_356636.m4a] [-map] [0:0] [-b:a] [128k] [-v] [0] [-f] [mp3] [-]

if i listen to a different podcast, everything works:
[1/17/15 3:12:39 PM CET] INFO PlayQueueInputStream admin listening to "Sanft & Sorgfältig - radioeins/zh_20141228_180000.mp3"

Troubleshooting Steps: As mentionioned, i checked with different podcasts, they work, the file itself also works, i increased the java memory limt to 512 MB
Playback Application and version: does not matter, error repreducable under ie 10, firefox 35 @ windows 7 & winserver 2012r2; IOS 8.1 iSub
Subsonic Version: 5.0-KANG – October 14, 2014
Server Version: jetty-6.1.x, java 1.6.0_33, Linux (98.7 MB / 150.4 MB)
Hardware Platform: Ubuntu 13.04,
Java Memory Limit: 512 MB
Problem Filename: all podcasts which are longer than 2 hours
Output from ffmpeg -i: ffmpeg: command not found
Last ten log file lines: [2015-01-17 15:12:39,396] INFO PlayQueueInputStream - admin listening to "Sanft & Sorgfältig - radioeins/zh_20141228_180000.mp3"
[2015-01-17 15:30:11,174] WARN StreamController - Unknown duration for ABGT113_356636. Unable to estimate transcoded size.
[2015-01-17 15:30:11,175] INFO PlayQueueInputStream - admin listening to "Above & Beyond- Group Therapy/ABGT113_356636.m4a"
[2015-01-17 15:30:11,177] DEBUG TranscodeInputStream - Starting transcoder: [/var/subsonic/transcode/ffmpeg] [-i] [/media/music/podcasts/Above & Beyond- Group Therapy/ABGT113_356636.m4a] [-map] [0:0] [-b:a] [128k] [-v] [0] [-f] [mp3] [-]
[2015-01-17 15:30:30,375] INFO PlayQueueInputStream - admin listening to "Sanft & Sorgfältig - radioeins/zh_20150104_180000.mp3"
<-------------------------Subsonic Help Request---------------------->

I think, maybe the length of the podcast could maybe thw problem, because the shorter ones work.

hope any of you girls/guys has an idea.
Thanks
Greetz frm Kiel!

[knopperhopper]

In the meantime I found a workaround:
I just deleted the .m4a file type from the transcoding string. Now I can playback the files.