[CpTHOOK]

 

 There are a couple of things you could try.

See if turning off the "ffmpeg reconnect arguments" helps.
Someone had a problem with them on their version of ffmpeg so I made them optional.

Turn on ffmpeg debugging in
Settings \ Debug \ Debug ffmpeg stdout/stderr
The output and error streams should then end up in the jobs folder.
userdata\addon_data\plugin.video.iptv.recorder\jobs
They should show you if avconv/ffmpeg even started and possible errors.

You could also try to install the official version of ffmpeg.
You might have to build it from source.
http://ffmpeg.org/download.html#build-linux    

Turning off reconnect arguments gave me the same results.  I turned on ffmpeg debugging prior to, per your recommendations.  Log below.  I'll have to read up on building a version of this from the source, any tips or guidance posts out there that you recommend?  The version listed in the LM software manager has the same link you provided.

DbugLog