Converts most videos to the same quality HTML5-compatible MP4+OGV

to_html5_videos.py

# coding: utf-8

"""
Converts videos inside the current directory to two complementary
HTML5 video formats while keeping the same quality.
The converted videos are placed in a subfolder.

You need avconv to be installed with some codecs
(packages libav-tools & libavcodecs-extra under Ubuntu)
"""

__author__ = 'Bertrand Bordage'
__copyright__ = 'Copyright © 2015 Bertrand Bordage'
__license__ = 'MIT'

import json
import os
from subprocess import check_output, PIPE, CalledProcessError


SUBFOLDER = 'Recompressed'
if not os.path.exists(SUBFOLDER):
    os.mkdir(SUBFOLDER)


def convert_to(extension, video_codec, audio_codec,
               video_bitrate, audio_bitrate):
    new_filename = os.path.join(SUBFOLDER,
                                os.path.splitext(filename)[0] + extension)
    print('Creating `%s`...' % new_filename)
    check_output([
        'avconv', '-i', filename, '-threads', '16',
        '-vcodec', video_codec, '-acodec', audio_codec,
        '-b:v', video_bitrate, '-b:a', audio_bitrate, '-y',
        new_filename], stderr=PIPE)


for filename in os.listdir('.'):
    try:
        output = check_output(['avprobe', '-of', 'json', '-show_streams',
                               filename], stderr=PIPE)
    except CalledProcessError:
        continue
    streams = json.loads(output.decode())['streams']
    video_streams = [s for s in streams if s['codec_type'] == 'video']
    audio_streams = [s for s in streams if s['codec_type'] == 'audio']
    if len(video_streams) != 1 and len(audio_streams) != 1:
        print('Skipping `%s` as it has %d video streams and %d audio streams'
              % (filename, len(video_streams), len(audio_streams)))
        continue

    video, audio = video_streams[0], audio_streams[0]
    convert_to('.ogv', 'libtheora', 'libvorbis',
               video['bit_rate'], audio['bit_rate'])
    convert_to('.mp4', 'libx264', 'libvo_aacenc',
               video['bit_rate'], audio['bit_rate'])