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encode.py
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encode.py
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#!/usr/bin/python3
import sys
import os
from shutil import rmtree, move
from xml.dom import minidom
import subprocess
from ffprobe3 import FFProbe
import argparse
version = "version 1.1"
parser = argparse.ArgumentParser(description=version)
parser.set_defaults(segment_duration=3000, i_factor=1)
parser.add_argument("source", help="path of video file to be dashed")
parser.add_argument('--version', action='version', version=version)
parser.add_argument("-s", type=int, action="store", dest="segment_duration",
help="set segement duration for DASHing")
parser.add_argument("-d", type=int, action="store", dest="output_duration",
help="set duration of total video output")
parser.add_argument("-c", dest="output_crf",
help="set CRF of video output")
parser.add_argument("-i", type=int, dest="i_factor",
help="factor of minimum i-frames required per segment")
group = parser.add_mutually_exclusive_group()
group.add_argument("-y", action="store_true", dest="overwrite",
help="never use previous encoding from ffmpeg if available")
group.add_argument("-n", action="store_false", dest="overwrite",
help="always use previous encoding from ffmpeg if available")
args = parser.parse_args()
print(version)
print(args)
input_filepath = args.source
# probe metadata
input_metadata = FFProbe(input_filepath)
for stream in input_metadata.streams:
if stream.is_video():
input_framerate = stream.frames() / stream.duration_seconds()
output_keyinput_framerate = round((args.segment_duration * input_framerate) / (1000 * args.i_factor))
dir_dashed = "video_dashed"
dir_encoded = "video_encoded"
### SETUP FOLDERS ###
# Set up folders if first run
def makeFolder(folderpath):
if not os.path.exists(folderpath):
os.makedirs(folderpath)
dashed = os.path.join(os.getcwd(), dir_dashed)
encoded = os.path.join(os.getcwd(), dir_encoded)
makeFolder(dashed)
makeFolder(encoded)
### SETUP FFMPEG ###
ffmpeg_options = ["ffmpeg",
"-i", input_filepath,
"-codec:v", "libx264",
"-x264-params", "keyint=" + str(output_keyinput_framerate) +
":min-keyint=" + str(output_keyinput_framerate) +
":scenecut=0",
"-strict", "-2",
"-codec:a", "aac"]
input_name = os.path.splitext(os.path.basename(input_filepath))[0]
output_filename = input_name + "_key-" + str(output_keyinput_framerate)
output_dir = input_name + "_key-" + str(args.segment_duration)
if (args.overwrite is not None):
if args.overwrite:
ffmpeg_options.extend(["-y"])
else:
ffmpeg_options.extend(["-n"])
if (args.output_crf is not None):
ffmpeg_options.extend(["-crf", args.output_crf])
output_filename += "_crf-" + args.output_crf
output_dir += "_crf-" + args.output_crf
if (args.output_duration is not None):
ffmpeg_options.extend(["-t", str(args.output_duration)])
output_filename += "_dur-" + str(args.output_duration)
output_dir += "_dur-" + str(args.output_duration)
mpd_filepath = input_name + ".mpd"
segment_formating = input_name + "_$RepresentationID$/Segment_$Number$$Init=0$"
### CLEAN UP ###
# Clean up previous runs with same parameters
for fname in os.listdir(dashed):
if fname.startswith(output_dir):
path = os.path.join(dashed, fname)
if os.path.isfile(path):
os.remove(path)
else:
rmtree(path)
# (Re-)encode (https://stackoverflow.com/a/30982414)
output_filepath = dir_encoded + "/" + output_filename + ".mp4"
ffmpeg_options.append(output_filepath)
subprocess.run(ffmpeg_options)
# Notes on encoding:
# ==================
# Results in poor quility due to scenecut:0, which avoids dynamic I-frames at scene cuts.
# https://stackoverflow.com/a/41735741
# https://videoblerg.wordpress.com/2017/11/10/ffmpeg-and-how-to-use-it-wrong/
# Alt. versions at
# https://stackoverflow.com/a/36185180
# https://gist.github.com/ddennedy/16b7d0c15843829b4dc4
# Audio codec change?: https://trac.ffmpeg.org/wiki/Encode/AAC#NativeFFmpegAACencoder
### DASHing ###
mp4box_options = ["MP4Box",
"-dash", str(args.segment_duration),
"-rap",
"-profile", "dashavc264:live",
"-out", input_name,
"-segment-name", segment_formating,
"-bs-switching", "no",
"-url-template",
output_filepath + "#video:id=video",
output_filepath + "#audio:id=audio"]
subprocess.run(mp4box_options)
### Generate IPFS Hashes of video and audio ###
video_folder_name = input_name + "_video"
audio_folder_name = input_name + "_audio"
if not (os.path.exists(video_folder_name) and os.path.exists(audio_folder_name) and os.path.exists(mpd_filepath)):
print("Files not generated for upload to IPFS")
sys.exit(2)
def ipfs_hash_path(path):
ipfs_options = ["ipfs", "add", "-Q", "--only-hash", "-r"]
ipfs_options.append(path)
process = subprocess.Popen(ipfs_options, stdout=subprocess.PIPE)
out, err = process.communicate()
return out.decode("utf-8")
audio_hash = ipfs_hash_path(audio_folder_name).rstrip()
video_hash = ipfs_hash_path(video_folder_name).rstrip()
### Edit MPD with IPFS Hashes ###
if audio_hash is None or video_hash is None:
print("Files not hashed for IPFS")
sys.exit(1)
mpd = minidom.parse(mpd_filepath)
adaptionSets = mpd.getElementsByTagName("AdaptationSet")
for a in adaptionSets:
if (a.getElementsByTagName("Representation")[0].attributes["id"].value == "video"):
a.getElementsByTagName("SegmentTemplate")[0].setAttribute("media", video_hash + "/Segment_$Number$.m4s")
a.getElementsByTagName("SegmentTemplate")[0].setAttribute("initialization", video_hash + "/Segment_0.mp4")
elif (a.getElementsByTagName("Representation")[0].attributes["id"].value == "audio"):
a.getElementsByTagName("SegmentTemplate")[0].setAttribute("media", audio_hash + "/Segment_$Number$.m4s")
a.getElementsByTagName("SegmentTemplate")[0].setAttribute("initialization", audio_hash + "/Segment_0.mp4")
# write to file
f = open(mpd_filepath, "w")
mpd.writexml(f)
f.close()
# print IPFS hash of MPD
print( ipfs_hash_path(mpd_filepath))
### Move newly created files to output destination ###
makeFolder(dashed + "/" + output_dir)
move(os.path.join(os.getcwd(), video_folder_name), dashed + "/" + output_dir)
move(os.path.join(os.getcwd(), audio_folder_name), dashed + "/" + output_dir)
move(os.path.join(os.getcwd(), mpd_filepath), dashed + "/" + output_dir)