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"""
On the long term this will implement several methods to make videos
out of VideoClips
"""
import subprocess as sp
import os
import numpy as np
from moviepy.compat import PY3, DEVNULL
from moviepy.config import get_setting
from moviepy.tools import verbose_print
class FFMPEG_VideoWriter:
""" A class for FFMPEG-based video writing.
A class to write videos using ffmpeg. ffmpeg will write in a large
choice of formats.
Parameters
-----------
filename
Any filename like 'video.mp4' etc. but if you want to avoid
complications it is recommended to use the generic extension
'.avi' for all your videos.
size
Size (width,height) of the output video in pixels.
fps
Frames per second in the output video file.
codec
FFMPEG codec. It seems that in terms of quality the hierarchy is
'rawvideo' = 'png' > 'mpeg4' > 'libx264'
'png' manages the same lossless quality as 'rawvideo' but yields
smaller files. Type ``ffmpeg -codecs`` in a terminal to get a list
of accepted codecs.
Note for default 'libx264': by default the pixel format yuv420p
is used. If the video dimensions are not both even (e.g. 720x405)
another pixel format is used, and this can cause problem in some
video readers.
audiofile
Optional: The name of an audio file that will be incorporated
to the video.
preset
Sets the time that FFMPEG will take to compress the video. The slower,
the better the compression rate. Possibilities are: ultrafast,superfast,
veryfast, faster, fast, medium (default), slow, slower, veryslow,
placebo.
bitrate
Only relevant for codecs which accept a bitrate. "5000k" offers
nice results in general.
withmask
Boolean. Set to ``True`` if there is a mask in the video to be
encoded.
"""
def __init__(self, filename, size, fps, codec="libx264", audiofile=None,
preset="medium", bitrate=None, withmask=False,
logfile=None, threads=None, ffmpeg_params=None):
if logfile is None:
logfile = sp.PIPE
self.filename = filename
self.codec = codec
self.ext = self.filename.split(".")[-1]
# order is important
cmd = [
get_setting("FFMPEG_BINARY"),
'-y',
'-loglevel', 'error' if logfile == sp.PIPE else 'info',
'-f', 'rawvideo',
'-vcodec', 'rawvideo',
'-s', '%dx%d' % (size[0], size[1]),
'-pix_fmt', 'rgba' if withmask else 'rgb24',
'-r', '%.02f' % fps,
'-i', '-', '-an',
]
if audiofile is not None:
cmd.extend([
'-i', audiofile,
'-acodec', 'copy'
])
cmd.extend([
'-vcodec', codec,
'-preset', preset,
])
if ffmpeg_params is not None:
cmd.extend(ffmpeg_params)
if bitrate is not None:
cmd.extend([
'-b', bitrate
])
if threads is not None:
cmd.extend(["-threads", str(threads)])
if ((codec == 'libx264') and
(size[0] % 2 == 0) and
(size[1] % 2 == 0)):
cmd.extend([
'-pix_fmt', 'yuv420p'
])
cmd.extend([
filename
])
popen_params = {"stdout": DEVNULL,
"stderr": logfile,
"stdin": sp.PIPE}
# This was added so that no extra unwanted window opens on windows
# when the child process is created
if os.name == "nt":
popen_params["creationflags"] = 0x08000000
self.proc = sp.Popen(cmd, **popen_params)
def write_frame(self, img_array):
""" Writes one frame in the file."""
try:
if PY3:
self.proc.stdin.write(img_array.tobytes())
else:
self.proc.stdin.write(img_array.tostring())
except IOError as err:
_, ffmpeg_error = self.proc.communicate()
error = (str(err) + ("\n\nMoviePy error: FFMPEG encountered "
"the following error while writing file %s:"
"\n\n %s" % (self.filename, ffmpeg_error)))
if b"Unknown encoder" in ffmpeg_error:
error = error+("\n\nThe video export "
"failed because FFMPEG didn't find the specified "
"codec for video encoding (%s). Please install "
"this codec or change the codec when calling "
"write_videofile. For instance:\n"
" >>> clip.write_videofile('myvid.webm', codec='libvpx')")%(self.codec)
elif b"incorrect codec parameters ?" in ffmpeg_error:
error = error+("\n\nThe video export "
"failed, possibly because the codec specified for "
"the video (%s) is not compatible with the given "
"extension (%s). Please specify a valid 'codec' "
"argument in write_videofile. This would be 'libx264' "
"or 'mpeg4' for mp4, 'libtheora' for ogv, 'libvpx for webm. "
"Another possible reason is that the audio codec was not "
"compatible with the video codec. For instance the video "
"extensions 'ogv' and 'webm' only allow 'libvorbis' (default) as a"
"video codec."
)%(self.codec, self.ext)
elif b"encoder setup failed" in ffmpeg_error:
error = error+("\n\nThe video export "
"failed, possibly because the bitrate you specified "
"was too high or too low for the video codec.")
elif b"Invalid encoder type" in ffmpeg_error:
error = error + ("\n\nThe video export failed because the codec "
"or file extension you provided is not a video")
raise IOError(error)
def close(self):
self.proc.stdin.close()
if self.proc.stderr is not None:
self.proc.stderr.close()
self.proc.wait()
del self.proc
def ffmpeg_write_video(clip, filename, fps, codec="libx264", bitrate=None,
preset="medium", withmask=False, write_logfile=False,
audiofile=None, verbose=True, threads=None, ffmpeg_params=None,
progress_bar=True):
""" Write the clip to a videofile. See VideoClip.write_videofile for details
on the parameters.
"""
if write_logfile:
logfile = open(filename + ".log", 'w+')
else:
logfile = None
verbose_print(verbose, "[MoviePy] Writing video %s\n"%filename)
writer = FFMPEG_VideoWriter(filename, clip.size, fps, codec = codec,
preset=preset, bitrate=bitrate, logfile=logfile,
audiofile=audiofile, threads=threads,
ffmpeg_params=ffmpeg_params)
nframes = int(clip.duration*fps)
for t,frame in clip.iter_frames(progress_bar=progress_bar, with_times=True,
fps=fps, dtype="uint8"):
if withmask:
mask = (255*clip.mask.get_frame(t))
if mask.dtype != "uint8":
mask = mask.astype("uint8")
frame = np.dstack([frame,mask])
writer.write_frame(frame)
writer.close()
if write_logfile:
logfile.close()
verbose_print(verbose, "[MoviePy] Done.\n")
def ffmpeg_write_image(filename, image, logfile=False):
""" Writes an image (HxWx3 or HxWx4 numpy array) to a file, using
ffmpeg. """
if image.dtype != 'uint8':
image = image.astype("uint8")
cmd = [ get_setting("FFMPEG_BINARY"), '-y',
'-s', "%dx%d"%(image.shape[:2][::-1]),
"-f", 'rawvideo',
'-pix_fmt', "rgba" if (image.shape[2] == 4) else "rgb24",
'-i','-', filename]
if logfile:
log_file = open(filename + ".log", 'w+')
else:
log_file = sp.PIPE
popen_params = {"stdout": DEVNULL,
"stderr": log_file,
"stdin": sp.PIPE}
if os.name == "nt":
popen_params["creationflags"] = 0x08000000
proc = sp.Popen(cmd, **popen_params)
out, err = proc.communicate(image.tostring())
if proc.returncode:
err = "\n".join(["[MoviePy] Running : %s\n" % cmd,
"WARNING: this command returned an error:",
err.decode('utf8')])
raise IOError(err)
del proc