Flexibility in targetFramesToRequest value

[CITIZENDOT]

Hardcoding it to 90 causes the player to stuck at buffering when the source files has few frames. (A file with 240 frames is stuck due to this issue). We probably need a better strategy to optimize this value for both small files and large files.

Trade off:

• Bigger targetFramesToRequest => Lesser requests,
• Smaller targetFramesToRequest => Support for small files