Compare Various FFMPEG Video Conversion Options

[thealphadollar]

Is your feature request related to a problem? Please describe.
At the moment, Nephos uses two pass encoding from FFMPEG to convert a trasport stream (.ts) file into a .mp4 file. We use the following settings in the FFPMEG to obtain the desired results.

Nephos/nephos/default_config/processing.sh

Line 15 in 348fe14

${PATH_TO_FFMPEG} -analyzeduration 2G -probesize 2G -y -i "${INPUT}" -c:v libx264 -b:v 500k -c:a copy -preset veryfast -pass 1 -f mp4 /dev/null &> ffmpeg.log

It is efficient but we lose the subtitles along the way, and also we'd want a better quality to time taken for conversion ratio.

Describe the solution you'd like
A brief analysis of all the conversion options (and encodings) available with FFMPEG and their detailed quality to time taken ratio. The aim of the task it to find a better method to compress the images quickly while retaining the same level of quality or better. It would be a plus point if we could retain the subtitles.

Describe alternatives you've considered
None.

Additional context
The assignee has the freedom to suggest a major change in the method we convert and preprocess files. It is desirable to have a PDF or Doc file as submission.

If the changes are deemed appropriate, a task to implement the same might follow.
One could gain a thorough knowledge of Video formats and encodings through this task.