@SohamTilekar - First of all, I moved the issue over to the discussion as you're asking a howto question rather than reporting an issue/bug (aside from poor documentation).

What is the exact FFmpeg command that you wish to execute with ffmpegio?

Let's say your command looks like this one from the official wiki:

ffmpeg -framerate 10 -pattern_type glob -i '*.jpg' -c:v libx264 -pix_fmt yuv420p out.mp4

This FFmpeg command translates to ffmpegio.transcode call as follows

import ffmpegio as ff

# progress callback template (straight out of the readme example
def progress(info, done):
    pprint(info) # bunch of stats
    if done:
        print('video decoding completed')
    else:
        return check_cancel_command(): # return True to kill immediately

ff.transcode('*.jpg', 'out.mp4', 
                    framerate_in=10, 
                    pattern_type_in='glob', 
                    **{'c:v': 'libx264'}, 
                    pix_fmt ='yuv420p', 
                    progress=progress)

Note that:

• An input option must be given with an appended _in to its key name.
• If FFmpeg option name cannot be used directly as Python function keyword, use dict expansion, e.g., **{'c:v': 'libx264'}