By MKV to SWF Converter you can set the audio bit rate and sample rate freely. MKV to SWF Converter features: 1.Support all the Windows platforms: such as Windows 2000 and later systems, both 32bit and 64bit systems, XP, Window 7. 2.Support to convert videos to audioin batches. 3.Support to extract silent movie or audio from vide respectively. 4.Support the functions of setting the resolution, frame and quality for the newly produced videos in advance. 5.Preview MP4 file(s) flexibly. 6.Professionally and flexibly change both of the audio and video parameters of targeting file(s) like the resolution or the audio bit rate etc. 5.Allow to customize the audio bit rate and sample rate freely to balance the size and audio quality.