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I have seen many videos with nearly same size and same length, but the clarity of the video changes or differs. I wanted to know the reason or fact behind this.

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    The Q isn't clear. Are you asking about image quality or focus/DoF? Can you illustrate with screenshots?
    – Gyan
    Commented Mar 27, 2016 at 6:17
  • I am asking about video quality. For instance, consider a video with two different type but the size is almost the same, then why is the one blurred then other?
    – Surendar
    Commented Mar 27, 2016 at 6:44
  • Attach examples.
    – Gyan
    Commented Mar 27, 2016 at 6:49
  • I always download the movies after 2-3days of realise with nearly 700MB thinking that it will be clear, and the same movie after a month with same size of nearly 700MB gives a more clear view to the one earlier download.
    – Surendar
    Commented Mar 27, 2016 at 7:00
  • That probably comes down to source quality.
    – Gyan
    Commented Mar 27, 2016 at 7:15

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There can be too many factors involved to properly answer your question. One is the image quality of the source footage, there are objective and subjective parameters influencing this. Examples:

  • proper lighting
  • set design
  • image framing

Etc.

Then there are technical parameters in the image aqcuisition involved:

  • quality of the cameras sensor
  • quality of the post production (grading etc)

Then there are parameters in the delivery:

  • delivery Codec
  • compressibility of the images

As for the "subjective" parameters, there are a lot of psychological things involved: a lot of people consider these things as "better" while really only being a matter of taste:

  • sharpened image
  • enhanced contrasts
  • less grain

So unless being more specific, your question IMHO cannot be answered.

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