Kdenlive 0.9.10, Ubuntu 12.04.5
Rendering to any output format fails with audio, deselecting audio succeeds. Older versions of Kdenlive worked successfully. Suggestions?

error messages:
Sorry, the program "melt" closed unexpectedly

Your computer does not have enough free memory to automatically analyze the problem and send a report to the developers.

Rendering of /home/jamie/Videos/test.mp4 crashed
medium:
[ ref=1
, _mlt_properties_load=medium
, __mlt_properties_load=medium
]

[mp4 muxer @ 0xb290b5a0] [Eval @ 0xb328995c] Undefined constant or missing '(' in 'faststart'
[mp4 muxer @ 0xb290b5a0] Unable to parse option value "faststart"

Try a daily buid version of kdenlive - https://userbase.kde.org/Kdenlive/Manua ... ily_builds
It comes with its own version of melt. And this might help with your issue.