FLV to Video ?? 
Ultra mkv to FLV Converter is professional Flash Video Encoder and SWF Converter software which helps you convert FLV and SWF video files like MPEG to FLV, 3GP to FLV, WMV to FLV, mkv to FLV, 3GP to SWF, MPEG to SWF, WMV to SWF, mkv to SWF, etc. The mkv to FLV Converter can convert so many video formats including DivX, XviD, mkv, WMV, MPG, MPEG, MP4, M4V, FLV, ASF, RM, RMVB, MOV, MOD, ASX, MKV, OGM, VCD files(.dat), VOB, mkv to FLV and SWF formats.
dvdXsoft mkv to FLV converter can convert Xvid, DivX, 3GP, MPEG, MPG, MPEG-1, MPEG-2, MPEG-4, WMV, mkv, RM, RMVB, MOV, and more other formats to FLV video format for playing on websites like YouTube, Metacafe or by software that supports FLV formats. Of course, you can also convert mkv to FLV with this FLV Converter Software. Do you want to play your own videos on websites? Do you want to upload your Movie to YouTube, Metacafe? Let's go.
Guide: How to convert mkv to FLV with the mkv to FLV Converter? Take Ultra mkv to FLV Converter for example.Step 1: Download something to convert mkv videos to FLV. 
Free download mkv to FLV Converter (Note, like we have already explained, this mkv to FLV converter is not only convert mkv to FLV, this mkv to FLV software can also convert many other video and audio formats to FLV formats).
Step 2: Launch the mkv to FLV Converter:
Step 3: Click 
to input mkv video file to be converted (batch convertsion supported, you can feel free to add as many as you wish). When "the add media files" popup window open you need to select "All Media Files" or "mkvP files(*.mkv, *.3G2)".
Tip: If your mobile phone video is *.mp4 formats, you should select MPEG-4 files.
Step 4: In the file list, click the FLV video file to be converted, the preview video screen may auto play the selected FLV file, just click pause button.
Step 5: Click the down arrow to choose FLV or SWF or both as you wish. 
Then click change, select the destination folder you want the converted mkv to save.
Step 6: Click 
button.
the process shall be looked like this:
After successful converting mkv to FLV, the converted video file shall be stored in the folder you have previously selected.
Convinced? Buy full version now.
To convert mkv to FLV with dvdXsoft FLV Video Converter is quite similar as the guide above. The differences are the appearence of the buttons like the following image. ( when add files you should select "All Supported files" or "Quicktime(*.mkv,*.m4a,*.m4v,*.mp4)").
Free download dvdXsoft FLV Video Converter and test yourself right now. Or, Buy full version dvdXsoft FLV Video Converter now.
Upload your FLV videos to YouTube like websites