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       HLS-31: Auto Calculation of bitrates

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Issue Type: New Feature 
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Issue Information
====================

Priority: Major					Status:      Open
Resolution:  Unresolved
Project: HLS Stream Creator (HLS)


Reported By: btasker					
Assigned To: btasker

Components: 
	- VoD support 
	- CLI Options 
	- Adaptive Streams 


Targeted for fix in version: 
	- VNEXT


Time Estimate: 120 minutes
Time Logged:   0 minutes


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Issue Description
==================

As part of my OnionStream experiment, I implemented a wrapper script for HLS Stream
creator ( in OS-11 ).

Most of what the wrapper does is inapplicable to the HLS Stream Creator codebase - it's
primarily concerned with fetching jobs from a queue, triggering HLS Stream Creator and
then marking the job complete (and tidying the originals away).

However, to aid automation, there is one aspect I implemented that I'd like to move into
this codebase.

The wrapper uses _ffprobe_ on the source file to get the original bitrate, and then
calculates the bitrates to specify in order to create an adaptive stream. At the moment it
generates the following bitrates:

- Source bitrate
- Source * 0.75
- Source * 0.5
- Source * 0.4
- if (source * 0.4 > 250kbps) - 200kbps

This seems to work quite well, so it'd be good to implement the ability to do similar
within the HLS Stream Creator codebase.

It shouldn't be the default behaviour, and should be enabled via a new CLI argument, at
least to begin with.

Within the wrapper, the calculations are done using python (in order to parse ffprobe's
JSON output). So will either need to translate that to BASH or build a short python
statement within the script.

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Activity
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2019-11-23 12:09:23              
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btasker added 'VNEXT' to Fix Version
	
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2019-11-23 12:09:23              
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btasker removed '1.0' from Fix Version