Hi Jay Lee! I am not expert in create plugins but I have some ideas.
For everyone to help you, please post the web site that you are interested to make the plugin and what it is for. Videos? I believe it is for videos because I went there to see.

Please sniff the connection for us and send it. Attach a copy of your plugin if you have one already.

Jay, i think we will need some modds on our current video-range matching engine. In your case, you have one url encoded var for BASE and other url encoded var for OFFSET.

Is that correct? If so, we will need some time to work on this code (backend code and frontend exposure of new resource).

The information requested by Alexandre should also be helpful.

PS: Our support guys forwarded me you support ticket, but this maybe of interest of some other foreign users. Is it ok for you if we keep it up here, on our forum?

Thank you all for your response. The site is www.tudou.com which is one of most popular video sharing site in China as far as I know. I can upload the sniff file but it's better for you to directly access the video as it's quite big.

Example video: http://www.tudou.com/programs/view/tc2azsIb4lI/

When video starts it may play advertisement that's about 30 seconds long then it fetches the video like below.

http://218.26.241.101/f4v/38/154741838.h264_1.f4v?81000&key=52b655f4b53c4a8711cd3a507d0c3200406079f8ac&playtype=1&tk=144204072609349007860141171&brt=2&bc=0&nt=0&du=1988530&ispid=800615&rc=200&inf=1&si=sp&npc=2702&pp=2&ul=2&mt=0&sid=81000&rid=0&rst=0&au=0&id=tudou&itemid=119297987&fi=154741838&sz=63099265&posky=EUnMlg9NR7MiXIxsFdH8X25ewfB95E&plybgn=1&start=0&length=204800

Directory path and file name is constant so I used "tudou.video/|r_url_path|" for url normalization. The _1 before the file extension is video quality and it often has other numbers. All other variables aren't important except for start and length which is important for video seeking. If you could implement this that would be really great. If you need more information please let me know.

Is this length unit defined in bytes? seconds? kbytes?

Can you check this variables against adverted content length on http headers of response?

Are the video metadata being corrected interpreted by video sampling layers?

When you check at video meta, can you see a consistent duration, as seen by the player?

It's in bytes. Request URL's length variable and Content-Length header of 200 response are both same. I'm not sure how the player interacts with video metadata. Attached is metadata details of a tudou.com video using flvtool2.

Jay, look at video meta report inside speedr. It will also decode metadata when it sees video media, will identify what type of media it is seeing and will parse metadata acordingly.

Take a look if its internal video metadata sampler is decoding metada correctly. You can tell that if duration and bitrate are showing OK at Video Meta inside your speedr.