pandora_cdosea/render_mlt.py

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2017-01-04 17:26:18 +00:00
#!/usr/bin/python
import os
import time
import sys
import json
import mlt
from PyQt5 import QtWidgets
# Avoid segfault in webvfx
app = QtWidgets.QApplication(sys.argv)
mlt.mlt_log_set_level(40) # verbose
mlt.Factory.init()
tractor = mlt.Tractor()
tractor.mark_in = -1
tractor.mark_out = -1
multitrack = tractor.multitrack()
source = sys.argv[1]
target = source.replace('.json', '.xml')
with open(source) as fd:
data = json.load(fd)
video = mlt.Playlist()
overlay = mlt.Playlist()
fps = 60
profile = mlt.Profile("atsc_1080p_%d" % fps)
#profile.set_explicit(1)
# get profile from clip
#clip = mlt.Producer(profile, 'test.mp4')
#profile.from_producer(clip)
def add_color(playlist, color, duration):
red = mlt.Producer(profile, 'color:' + color)
red.set_in_and_out(0, duration)
playlist.append(red)
def add_clip(playlist, file_, in_, duration):
if not isinstance(file_, str):
file_ = file_.encode('utf-8')
clip = mlt.Producer(profile, file_)
clip.set_in_and_out(in_, in_+duration-1)
playlist.append(clip)
def add_blank(playlist, length):
playlist.blank(length)
def add_text(playlist, value, length):
if not isinstance(value, str):
value = value.encode('utf-8')
text = mlt.Producer(profile, 'webvfx:text.html')
text.set('transparent', 1)
text.set('title', value)
text.set('length', length)
playlist.append(text)
for clip in data['clips']:
if clip.get('black'):
# fixme seconds to fps! duration fame etc!!
frames = int(clip['duration'] * fps)
add_color(video, 'black', frames)
else:
print(clip['duration'], clip['path'])
if not os.path.exists(clip['path']):
print(clip['path'], 'is missing')
sys.exit(1)
# fixme seconds to fps!
in_ = int(clip['in'] * fps)
frames = int(clip['duration'] * fps)
add_clip(video, clip['path'], in_, frames)
for clip in data['text']:
if clip.get('blank'):
frames = int(clip['duration'] * fps)
add_blank(overlay, frames)
else:
frames = int(clip['duration'] * fps)
add_text(overlay, clip['text'].upper(), frames)
multitrack.connect(video, 0)
multitrack.connect(overlay, 1)
composite = mlt.Transition(profile, "composite")
#composite.set('fill', 0)
tractor.plant_transition(composite)
consumer = 'xml'
consumer = mlt.Consumer(profile, consumer, target)
consumer.connect(tractor)
#consumer.set("real_time", -2)
consumer.start()