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gst/extend/discoverer.py: New parameter to the discoverer to change the default maximum frame interleave.

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Original commit message from CVS:
reviewed by: Edward Hervey  <bilboed@bilboed.com>
* gst/extend/discoverer.py:
New parameter to the discoverer to change the default maximum frame
interleave.
Fixes #418222
This commit is contained in:
Edward Hervey 2007-07-27 11:12:33 +00:00
parent c2a593851e
commit 42a768f4a3
2 changed files with 28 additions and 9 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2007-07-27 Sebastien Merle <sylane@gmail.com>
reviewed by: Edward Hervey <bilboed@bilboed.com>
* gst/extend/discoverer.py:
New parameter to the discoverer to change the default maximum frame
interleave.
Fixes #418222
2007-07-27 Aidan Delaney <a.j.delaney@brighton.ac.uk>
reviewed by: Edward Hervey <bilboed@bilboed.com>

29
gst/extend/discoverer.py
View file

@ -74,7 +74,15 @@ class Discoverer(gst.Pipeline):
tags = {}
def __init__(self, filename):
def __init__(self, filename, max_interleave=1.0):
"""
filename: str; absolute path of the file to be discovered.
max_interleave: int or float; the maximum frame interleave in seconds.
The value must be greater than the input file frame interleave
or the discoverer may not find out all input file's streams.
The default value is 1 second and you shouldn't have to change it,
changing it mean larger discovering time and bigger memory usage.
"""
gobject.GObject.__init__(self)
self.mimetype = None
@ -106,6 +114,7 @@ class Discoverer(gst.Pipeline):
self._nomorepads = False
self._timeoutid = 0
self._max_interleave = max_interleave
if not os.path.isfile(filename):
self.debug("File '%s' does not exist, finished" % filename)
@ -307,20 +316,22 @@ class Discoverer(gst.Pipeline):
(self.sinknumber, "audio" in caps.to_string() and "audio" or "video"))
self.sinknumber += 1
queue = gst.element_factory_make("queue")
# we want the queue to buffer up to 2 seconds of data before outputting
# This enables us to cope with formats that don't create their source
# pads straight away, but instead wait for the first buffer of that
# stream.
queue.props.min_threshold_time = 1 * gst.SECOND
queue.props.max_size_time = 2 * gst.SECOND
# we want the queue to buffer up to the specified amount of data
# before outputting. This enables us to cope with formats
# that don't create their source pads straight away,
# but instead wait for the first buffer of that stream.
# The specified time must be greater than the input file
# frame interleave for the discoverer to work properly.
queue.props.min_threshold_time = int(self._max_interleave * gst.SECOND)
queue.props.max_size_time = int(2 * self._max_interleave * gst.SECOND)
queue.props.max_size_bytes = 0
# If durations are bad on the buffers (common for video decoders), we'll
# never reach the min_threshold_time or max_size_time. So, set a large
# never reach the min_threshold_time or max_size_time. So, set a
# max size in buffers, and if reached, disable the min_threshold_time.
# This ensures we don't fail to discover with various ffmpeg
# demuxers/decoders that provide bogus (or no) duration.
queue.props.max_size_buffers = 100
queue.props.max_size_buffers = int(100 * self._max_interleave)
def _disable_min_threshold_cb(queue):
queue.props.min_threshold_time = 0
queue.disconnect(signal_id)