Validate if the video file can be streamed

[gilgamezh]

To serve a video file over HTTP depends on the video 'hinting'.
The video file has three parts. ftyp, moov and mdat. If mdat is located before moov the video can't be streamed.

We can use the function get_index of qtfaststart to validate it.

https://github.com/danielgtaylor/qtfaststart/blob/master/qtfaststart/processor.py#L54

If the video can't be streamed, what should touchandgo do?

[felipelerena]

I think there is something else related to the file allocation method we are using.

[gilgamezh]

Test Cases:

• "the loftovers" 1 8 (big moov at the end)
• Vikings 2 1 (moov at the end)
• Wilfred 4 3 (can be stramed immediately)

[gilgamezh]

Job started in https://github.com/touchandgo-devs/touchandgo/tree/issue_18

Now when the firts chunks are downloaded it will check if the moov is available.
If it isn't avaliable it will download the last four chunks.
And finally it will extend the first and last ranges until the moov is available.

Currently with some bugs