ShrinkrTranscode

# Transcode All Video Files in a Folder to 1080p Files
#
# Run: scons -f Shrinkr1080p

import glob
import os
import shutil

# Refs:
# https://trac.ffmpeg.org/wiki/Encode/H.264

TRANSCODE_CMD             = 'ffmpeg -benchmark -i ${SOURCE} -vf "scale=-2:1080" -c:v libx264 -crf 17 -preset medium -c:a copy -y ${TARGET}'
TRANSCODE_FILENAME_SUFFIX = '-1080p'

INPUT_FILE_EXTS           = ['*.mp4', '*.mkv']

def emitTranscodeTargetName(target, source, env):
    # Transcode files are stored right next to the original-resolution video file,
    # but suffixed with TRANSCODE_FILENAME_SUFFIX.

    base, ext = os.path.splitext(str(source[0]))
    t = '{}{}{}'.format(base, TRANSCODE_FILENAME_SUFFIX, ext)
    print ('Transcode: {} -> {}'.format(str(source[0]), t))
    return (t, source)

buildTranscodeFormat = Builder(
    action  = TRANSCODE_CMD,
    emitter = emitTranscodeTargetName
)

# Find ffmpeg and add that - and only that - path to the build environment.
#
# On Linux   use 'which ffmpeg'
# On Windows use 'where ffmpeg'
#
# If ffmpeg isn't in your PATH environment variable and cannot be found,
# then specify the folder location explicitly here.

ffmpegLocation = shutil.which('ffmpeg')

if ffmpegLocation:
    ffmpegFolder, ffmpegExe = os.path.split(ffmpegLocation)
else:
    ffmpegFolder = ''
    if ffmpegFolder == '':
        print('WARNING: Set ffmpegFolder to the location of your ffmpeg executable.')

env = Environment(
    ENV =  {'PATH': ffmpegFolder},
    BUILDERS = {
        'Transcode': buildTranscodeFormat
    }
)

# Do all video files in this folder by default

for container in INPUT_FILE_EXTS:
    print('Checking {}'.format(container))
    for video_filename in glob.glob(container):
        if TRANSCODE_FILENAME_SUFFIX not in video_filename:
            env.Transcode(video_filename)