Member 11250252 asked:
how to solve this problem?
First, read on the compatibility of HTML5
video
element with media formats and codecs:
http://en.wikipedia.org/wiki/HTML5_video#Supported_video_formats[
^].
Then, learn what your files are and re-master them to something which is more likely to work. For both things, the best tool I know is FFmpeg or libav set or open-source utilities:
http://en.wikipedia.org/wiki/FFmpeg[
^],
http://en.wikipedia.org/wiki/Libavcodec[
^],
http://ffmpeg.org/[
^],
http://libav.org/[
^].
These tools are good for nearly all chores related to media, and also can be used in programming. The set of formats and codecs embedded or plugged-in in this product is also the most comprehensive one.
By the way, on Windows, it's good to have K-Lite Codec Pack with Windows Media Player Classis, which also provides good diagnostics. One alternative is VLC, which does not depends on codecs but uses libav codec set internally.
—SA