Audio converter for mac seems to be stuck whilst trying to convert any audible file to m4a

You state on your web page your Total Media Converter will take itunes videos and convert them to, for example MKV format. I would like to take videos I have purchased, convert, and put on a media drive to watch on TV without having to use a Apple device as the play source.
Does your software perform as your web page states? If so what is the trick?
If you tell me I have to purchase the product to enable that feature it undermines a trial of your product.

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I downloaded all the episodes of Bluestone 42 from BBC iPlayer and I want to put them onto my 4th Gen iPod touch but I can't find any decent video file converters. Anyone know any?

I want a converter program to convert video to gif easily. Windows movie maker helps me get video clips, but I need a good gif converter without watermark inserted. Help? I have tried a lot, either give low quality or come with watermarks.

I downloaded all the episodes of Bluestone 42 from BBC iPlayer and I want to put them onto my 4th Gen iPod touch but I can't find any decent video file converters. Anyone know any?
Thanks

i was converting .H264 file to MP4 but it gives Muxing failed.