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With the Parameter "-movflags frag_custom" my avconv says

[mp4 muxer @ 0x8d05f60] [Eval @ 0x7fffcc763f00] Undefined constant or missing '(' in 'frag_custom' [mp4 muxer @ 0x8d05f60] Unable to parse option value "frag_custom"

[mp4 muxer @ 0x8d05f60] Error setting option movflags to value frag_custom.

But with avconv is compiled with a mp4 muxer, so whats the problem ?

Version is avconv 0.8.1-4:0.8.1-0ubuntu1

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