# Copyright (C) 2012, Almar Klein
# All rights reserved.
#
# This code is subject to the (new) BSD license:
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of the <organization> nor the
# names of its contributors may be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
#
# changes of this file GRASS (PNG instead of JPG) by Anna Petrasova 2013
""" Module images2avi
Uses ffmpeg to read and write AVI files. Requires PIL
I found these sites useful:
http://www.catswhocode.com/blog/19-ffmpeg-commands-for-all-needs
http://linux.die.net/man/1/ffmpeg
"""
import os
import time
import subprocess
import shutil
from grass.imaging import images2ims
import grass.script as gscript
def _cleanDir(tempDir):
for i in range(3):
try:
shutil.rmtree(tempDir)
except Exception:
time.sleep(0.2) # Give OS time to free sources
else:
break
else:
print("Oops, could not fully clean up temporary files.")
[docs]def writeAvi(
filename,
images,
duration=0.1,
encoding="mpeg4",
inputOptions="",
outputOptions="",
bg_task=False,
):
"""Export movie to a AVI file, which is encoded with the given
encoding. Hint for Windows users: the 'msmpeg4v2' codec is
natively supported on Windows.
Images should be a list consisting of PIL images or numpy arrays.
The latter should be between 0 and 255 for integer types, and
between 0 and 1 for float types.
Requires the "ffmpeg" application:
* Most linux users can install using their package manager
* There is a windows installer on the visvis website
:param str filename: output filename
:param images:
:param float duration:
:param str encoding: the encoding type
:param inputOptions:
:param outputOptions:
:param bool bg_task: if thread background task, not raise but
return error message
:return str: error message
"""
# Get fps
try:
fps = float(1.0 / duration)
except Exception:
raise ValueError(_("Invalid duration parameter for writeAvi."))
# Determine temp dir and create images
tempDir = os.path.join(os.path.expanduser("~"), ".tempIms")
images2ims.writeIms(os.path.join(tempDir, "im*.png"), images)
# Determine formatter
N = len(images)
formatter = "%04d"
if N < 10:
formatter = "%d"
elif N < 100:
formatter = "%02d"
elif N < 1000:
formatter = "%03d"
# Compile command to create avi
command = "ffmpeg -r %i %s " % (int(fps), inputOptions)
command += "-i im%s.png " % (formatter,)
command += "-g 1 -vcodec %s %s " % (encoding, outputOptions)
command += "output.avi"
# Run ffmpeg
S = subprocess.Popen(
command, shell=True, cwd=tempDir, stdout=subprocess.PIPE, stderr=subprocess.PIPE
)
# Show what ffmpeg has to say
outPut = S.stdout.read()
if S.wait():
# Clean up
_cleanDir(tempDir)
if bg_task:
return (
gscript.decode(outPut)
+ "\n"
+ gscript.decode(S.stderr.read())
+ "\n"
+ _("Could not write avi.")
)
else:
# An error occurred, show
print(gscript.decode(outPut))
print(gscript.decode(S.stderr.read()))
raise RuntimeError(_("Could not write avi."))
else:
try:
# Copy avi
shutil.copy(os.path.join(tempDir, "output.avi"), filename)
except Exception as err:
# Clean up
_cleanDir(tempDir)
if bg_task:
return str(err)
else:
raise
# Clean up
_cleanDir(tempDir)
[docs]def readAvi(filename, asNumpy=True):
"""Read images from an AVI (or MPG) movie.
Requires the "ffmpeg" application:
* Most linux users can install using their package manager
* There is a windows installer on the visvis website
:param str filename: name of input movie file
:param bool asNumpy:
"""
# Check whether it exists
if not os.path.isfile(filename):
raise OSError("File not found: " + str(filename))
# Determine temp dir, make sure it exists
tempDir = os.path.join(os.path.expanduser("~"), ".tempIms")
if not os.path.isdir(tempDir):
os.makedirs(tempDir)
# Copy movie there
shutil.copy(filename, os.path.join(tempDir, "input.avi"))
# Run ffmpeg
command = "ffmpeg -i input.avi im%d.jpg"
S = subprocess.Popen(
command, shell=True, cwd=tempDir, stdout=subprocess.PIPE, stderr=subprocess.PIPE
)
# Show what mencodec has to say
outPut = S.stdout.read()
if S.wait():
# An error occurred, show
print(outPut)
print(S.stderr.read())
# Clean up
_cleanDir(tempDir)
raise RuntimeError("Could not read avi.")
else:
# Read images
images = images2ims.readIms(os.path.join(tempDir, "im*.jpg"), asNumpy)
# Clean up
_cleanDir(tempDir)
# Done
return images
