There are so many video resources in so many formats by now, and you need to convert them to some certain format so as to play them on some certain device. You need to choose a video converting vtt to srt first. Since most video converting vtt to srt are similar at the first look and those applications usually have a lot functions and features in common, it is difficult to make a decision. In fact, there is never the best choice but there is always the most suitable one for your needs.
The first thing you need to find out is whether the video converting vtt to srt supports the input formats that you are converting from and the output formats that you are converting to. The supported input formats should contain almost all video formats while the supported output formats should include most of popular video formats. For example, Sothink Free Video converting vtt to srt supports AVI (DivX, XivD), MP4, MKV, MOV, WMV, TS, FLV, SWF, ASF, MPG, 3GP, 3G2, VOB (VCD), and DV. That will probably be enough.
2) Support popular multimedia devices
To successfully and perfectly play videos on some multimedia devices, especially HD devices, you need to convert video to correct format and appropriate dimension, zoom mode, aspect ratio, bit rate, frame rate, and so on. It will not be necessary to know those professional details if you choose some video converting vtt to srt that automatically set all related properties for the best and directly convert video to your desired target device. Just check out whether the video convert software supports iPad, iPod, iPod Touch, iPhone, iPhone 4, Apple TV, PSP, PS3, Xbox 360, Zune, Wii, Blackberry, Nokia, Sony Ericsson, Google Android, Nexus One, Samsung, Motorola, etc.
3) Support trimming video to clip
Since you convert files from some source video or audio, you can definitely trim the files to the part you really need. Many video convert tools support trimming video to the desired clip and some of them even support cropping. Whether it is easy to trim is also important. Directly setting the start time and end time of the trimmed clip will be great.