def transcode(self, media_in, media_out, encoder_string=''):
"""
Transcodes ``media_in`` using ffmpeg with the profile specified by ``encoder_string``
and saves the transcoded media to the private url of ``media_out``.
This method is asynchronous and only returns the task identifier. Current progress status
can be obtained with the tasks api.
.. note:: Transcoding relies on both ``ffmpeg`` and ``ffprobe`` binaries; those should be
available by the ``PATH`` variable.
"""
# get file locators for input/output media
selector = VolumeSelector()
volume = selector.backend_for(selector.scheme(media_in.private_url))()
try:
# try to access input file from absolute path
input_file = volume.path(media_in.private_url)
except NotImplementedError:
try:
# try to access input file from url
input_file = 'cache:' + volume.url(media_in.private_url)
except NotImplementedError:
# since we can't user neither path nor url, we'll
# copy the input file to a local temporary file
with volume.open(media_in.private_url) as f:
input_file = self._local_copy(f)
# write the output file to a temporary file
_, output_file = tempfile.mkstemp()
# start ffmpeg task
return self._start_ffmpeg_task(input_file, output_file, encoder_string, media_out)
def _handle_ffmpeg_complete(self, ffmpeg_proc, output_info):
"""
Handles the termination of a ffmpeg task.
"""
status_code = ffmpeg_proc.poll()
if status_code == 0:
# copy the transcoded file to the output media's private_url
private_url = output_info['media'].private_url
selector = VolumeSelector()
volume = selector.backend_for(selector.scheme(private_url))()
try:
os.rename(output_info['filename'], volume(private_url).path)
except NotImplementedError:
with open(output_info['filename'], 'rb') as f:
volume.save(private_url, f)
output_info['media'].status = 'ready'
else:
output_info['media'].status = 'failed'
output_info['media'].save()
cache.set('task_ffmpeg_{0}'.format(ffmpeg_proc.pid), {
'eta': 0,
'progress' : 100
})
logger.info('ffmpeg job [%i] exited with status %i' % (ffmpeg_proc.pid, status_code))
def transcode(self, media_in, media_out, encoder_string=''):
# get file locators for input/output media
selector = VolumeSelector()
volume_in = selector.backend_for(selector.scheme(media_in.private_url))()
volume_out = selector.backend_for(selector.scheme(media_out.private_url))()
# copy input file into output
with volume_in.open(media_in.private_url, 'rb') as i:
volume_out.save(media_out.private_url, i)
def publish(self, media, public_name):
if media.public_url:
raise ValueError("%(media)s is already published on %(url)s" % {
'media': str(media),
'url': media.public_url
})
selector = VolumeSelector()
volume = selector.backend_for(selector.scheme(media.private_url))()
try:
private_path = volume.path(media.private_url)
symlink = True
except NotImplementedError:
with volume.open(media.private_url) as f:
private_path = self._local_copy(f)
symlink = False
# check that the publication path doesn't override an existing file
publication_path = safe_join(self.root, public_name)
if os.path.exists(publication_path):
raise ValueError("The publication path is not available.")
# create any intermediate directories to the publication path that do not exist
directory = os.path.dirname(publication_path)
if not os.path.exists(directory):
try:
if self.directory_permissions_mode is not None:
# os.makedirs applies the global umask, so we reset it,
# for consistency with file_permissions_mode behavior.
old_umask = os.umask(0)
try:
os.makedirs(directory, self.directory_permissions_mode)
finally:
os.umask(old_umask)
else:
os.makedirs(directory)
except OSError as e:
if e.errno != errno.EEXIST:
raise
if not os.path.isdir(directory):
raise IOError("%s exists and is not a directory." % directory)
# create a symlink or a copy to the file being published
if symlink:
os.symlink(private_path, publication_path)
else:
os.rename(private_path, publication_path)
# compute and return publication url
media.public_url = urljoin(self.base_url, public_name)
media.save()
return media.public_url
def clean(self):
# try to guess the media type if not provided
if not self.media_type and self.private_url:
from meho.core.volumes import VolumeSelector
from mimetypes import guess_type
selector = VolumeSelector()
volume = selector.backend_for(selector.scheme(self.private_url))()
mime, encoding = guess_type(volume.filename(self.private_url))
if mime:
self.media_type = mime
if encoding:
self.media_type += '; ' if mime else ''
self.media_type += encoding
