From Lovo Apps:
This App can Convert Video or Audio files in other formats. You can convert a file in few simple steps maintaining or decreasing its quality, or for example you can extract the audio of a video. In addition, when each operation will be completed, you'll be noticed with a toast notification. Advertising can be removed through the settings menu. Saving formats: MP4, MP3, WMV, WMA, AAC Source formats: MP4, MP3, WMV, WMA, AAC, AVI, MPG, MPEG, MOV, WAV, M4V, M4A, AC3, PCM NB. At the moment the App can't support other formats because Windows 8 supports H264, MPEG2, WMV3, WVC1, AAC, AC3, MP3, MPEG, PCM, WMA8 and WMA9 codecs. NB. At the moment the App can convert in background, but this is not true for large files because of a Windows 8 limitation. We suggest you to use the App in snapped mode while converting. In future we hope we can enable this feature also for large files.