Using gst-discoverer I can get a list of the sub-titles available in an mkv file but they come out in what appears to be a random order.
Does anyone know, using python, how to get the index for each sub-title stream.
Once the index is known a simple
self.pipeline.set_property("current-text",subno)
will change the sub-title stream being used.
Here is a simple mock up that plays an mkv and lists the subtitles available:
#!/usr/bin/env python
import time
from gi.repository import Gst
from gi.repository import GstPbutils
Gst.init(None)
discoverer = GstPbutils.Discoverer()
uri='file:///home/rolf/H.mkv'
info = discoverer.discover_uri(uri)
for x in info.get_subtitle_streams():
print x.get_language()
pipeline=Gst.ElementFactory.make("playbin", "playbin")
pipeline.set_property('uri',uri)
pipeline.set_state(Gst.State.PLAYING)
time.sleep(2)
subs = pipeline.get_property('n-text')
print "there are ", subs, " Subtitles"
auds = pipeline.get_property('n-audio')
print "there are ", auds, " Audio streams"
vids = pipeline.get_property('n-video')
print "there are ", vids, " Video Streams"
subc = pipeline.get_property('current-text')
print "Currently using ", subc, " Subtitle set"
dur = int(info.get_duration())/Gst.SECOND
hh = int(dur/3600)
mm, ss = (divmod(int(divmod(dur,3600)[1]),60))
print("Duration : %02d:%02d:%02d" % (hh,mm,ss))
time.sleep(dur)
Here is a working solution with no reliance on gst-discoverer-1.0
[updated for python3]
#!/usr/bin/env python
import time
import gi
gi.require_version('Gst', '1.0')
gi.require_version('GstTag', '1.0')
gi.require_version('GstVideo', '1.0')
from gi.repository import Gst, GstTag
from gi.repository import GstVideo
Gst.init(None)
uri='file:///home/rolf/H.mkv'
pipeline=Gst.ElementFactory.make("playbin", "playbin")
pipeline.set_property('uri',uri)
suburi = "file:///home/rolf/H.srt"
suburi = pipeline.set_property('suburi', suburi)
pipeline.set_state(Gst.State.PLAYING)
time.sleep(1.0)
subs = pipeline.get_property('n-text')
auds = pipeline.get_property('n-audio')
vids = pipeline.get_property('n-video')
print (vids, "Video Streams ", auds, "Audio Streams ", subs, "Subtitle Streams")
subc = pipeline.get_property('current-text')
dur = (pipeline.query_duration(Gst.Format.TIME)[1]) / Gst.SECOND
hh = int(dur/3600)
mm, ss = (divmod(int(divmod(dur,3600)[1]),60))
print("Duration : %02d:%02d:%02d" % (hh,mm,ss))
for x in range(subs):
tags = pipeline.emit("get-text-tags", x)
if tags:
for i in range(tags.n_tags()):
if tags.nth_tag_name(i) == "language-code":
name = tags.nth_tag_name(i)
if name == "language-code":
current_code = tags.get_string(name)[1]
if current_code != "und":
language = GstTag.tag_get_language_name(current_code)
else:
language = "??"
print(current_code, language)
else:
print( "No subtitle tags listed")
pipeline.set_property("current-text", 9)
print( "Currently using Subtitle set ", pipeline.get_property('current-text'))
time.sleep(dur)
[output]
1 Video Streams 1 Audio Streams 10 Subtitle Streams
Duration : 01:36:40
No subtitle tags listed
en English
ro Romanian; Moldavian; Moldovan
da Danish
cs Czech
hu Hungarian
bg Bulgarian
pl Polish
sl Slovenian
el Greek, Modern (1453-)
Currently using Subtitle set 9
The reference to No subtitle tags listed is to the manually attached sub-title file H.srt