I just want to know what could be reasons when video can't be played while streaming online though site using flash it shows error can't play video.
I am using Chrome browser on my Sony Xperia SP running Android 4.3 Jelly Bean.
It could be because Chrome for Android does not support Flash:
Chrome for Android will not be supporting Flash. As you may have seen in November, 2011, Adobe announced it has stopped investing in Flash for mobile browsing. Google has long been committed to making the web platform more powerful through open web technologies like HTML5 and is working with Adobe and other partners to further advance the web standard.