A script to automate the cutting and processing of a video recording. It requried ffmpeg to be installed and available on the path.

process_vids.py

""" Takes one or more raw inputs, splits into smaller sections, prepends on an intro, cleans audio
    and compresses for upload to slack
"""
import subprocess
from os import listdir
from os.path import isfile, join

split_times = [
    {
        "name": "Test V1d 1",
        "start_time": "00:00:18",
        "end_time": "00:11:37"
    },
    {
        "name": "Test Vid 2",
        "start_time": "00:33:18",
        "end_time": "00:40:37"
    }
]

# Load the input files and merge to a single files
# Generate input list
with open('./temp/inlist.txt', 'w') as f:
    for vid_file in listdir('raw/'):
        if isfile(join('raw/', vid_file)):
            # Write to ffmpeg input file
            f.writelines("file ../raw/"+vid_file+'\n')


JOINED_FILE = 'temp/raw_joined.mp4'

# Join all the raw files
# Keep audio track 1 from the source videos
audo_channel = 1
command = 'ffmpeg -f concat -safe 0 -i temp/inlist.txt -map 0:0 -map 0:{audio} -acodec copy -vcodec copy temp/raw_joined.mp4'.format(audio=audo_channel)
print subprocess.check_output(command)

# Split the joined file into sections
# Apply loudness normalisation to the  audio and filter for speech
# Maybe two pass loudness normalisation would be better http://k.ylo.ph/2016/04/04/loudnorm.html
for section in split_times:
    name = section['name']
    start_time = section['start_time']
    end_time = section['end_time']
    # print(start_time, end_time, name)

    command = 'ffmpeg -i {input_file} ' \
    ' -s 1366x768 ' \
    ' -vcodec h264 -acodec mp2 ' \
    ' -ss {start} -to {end} '\
    ' -af "highpass=f=200, lowpass=f=3000" -af loudnorm=I=-16:TP=-1.5:LRA=11' \
    ' {output_file} '.format(
        start=start_time,
        end=end_time,
        input_file=JOINED_FILE,
        output_file='"output/'+name+'.mp4"'
    )

    subprocess.check_call(command)

# Clean up the temp directory
# TODO