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possible glimagesink bug - not thread safe?

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Speedy Gonzales-2

possible glimagesink bug - not thread safe?

Hello,

Consider following Python code, which creates four simple pipelines at
the same time:

import wx
import pygst
pygst.require("0.10")
import gst

players = []
for i in range(4):
players.append(gst.parse_launch("videotestsrc ! glimagesink"))

for player in players:
player.set_state(gst.STATE_PLAYING)

app = wx.App(redirect=False)
frame = wx.Frame(None)
frame.Show()
app.MainLoop()

This code crashes a lot with various errors:
- 0xc0000005 exceptions
- fatal flex scanner internal error--end of buffer missed
- (python.exe:2788): GstGLShader-WARNING **: Fragment Shader
compilation failed: ERROR: 0:1: 'float' : syntax error parse error

Sometimes, however, it runs OK.

To me it looks like some bug in glimagesink having something to do
with thread safety. Anyone have any ideas what might be the cause of
this strange behaviour and how to get rid of it?

Regards,
Aulia Khamil

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Julien Isorce

Re: possible glimagesink bug - not thread safe?

Hi,

Right now I can't test your exact example on linux I guess ?

But I have tested this one on Windows with no problems:

--------------------------------
import gobject
import pygst
pygst.require("0.10")
print dir(pygst)
import gst

players = []
for i in range(10):
players.append(gst.parse_launch("videotestsrc ! glimagesink"))

for player in players:
player.set_state(gst.STATE_PLAYING)

gobject.MainLoop().run()
--------------------------------

What's the exact version of your gstreamer (core/base/gl/python) ? Are you building it from git or ?

Julien

2010/7/24 Aulia Khamil <[hidden email]>

Hello,

Consider following Python code, which creates four simple pipelines at
the same time:

import wx
import pygst
pygst.require("0.10")
import gst

players = []
for i in range(4):
players.append(gst.parse_launch("videotestsrc ! glimagesink"))

for player in players:
player.set_state(gst.STATE_PLAYING)

app = wx.App(redirect=False)
frame = wx.Frame(None)
frame.Show()
app.MainLoop()

This code crashes a lot with various errors:
- 0xc0000005 exceptions
- fatal flex scanner internal error--end of buffer missed
- (python.exe:2788): GstGLShader-WARNING **: Fragment Shader
compilation failed: ERROR: 0:1: 'float' : syntax error parse error

Sometimes, however, it runs OK.

To me it looks like some bug in glimagesink having something to do
with thread safety. Anyone have any ideas what might be the cause of
this strange behaviour and how to get rid of it?

Regards,
Aulia Khamil

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Speedy Gonzales-2

Re: possible glimagesink bug - not thread safe?

I was running it on Windows Vista using latest GStreamer WinBuilds
0.10.6 (gstreamer-0.10.28, gst-plugins-base-0.10.28,
gst-plugins-gl-0.10.1) and Python 2.6.4.

As a temporary fix I replaced glimagesink with dshowvideosink - works fine.

Regards,
Aulia Khamil

2010/7/24 Julien Isorce <[hidden email]>:

> Hi,
>
> Right now I can't test your exact example on linux I guess ?
>
> But I have tested this one on Windows with no problems:
>
> --------------------------------
> import gobject
> import pygst
> pygst.require("0.10")
> print dir(pygst)
> import gst
>
> players = []
> for i in range(10):
> players.append(gst.parse_launch("videotestsrc ! glimagesink"))
>
> for player in players:
> player.set_state(gst.STATE_PLAYING)
>
> gobject.MainLoop().run()
> --------------------------------
>
> What's the exact version of your gstreamer (core/base/gl/python) ? Are you
> building it from git or ?
>
> Julien
>
>
> 2010/7/24 Aulia Khamil <[hidden email]>
>>
>> Hello,
>>
>> Consider following Python code, which creates four simple pipelines at
>> the same time:
>>
>> import wx
>> import pygst
>> pygst.require("0.10")
>> import gst
>>
>> players = []
>> for i in range(4):
>> players.append(gst.parse_launch("videotestsrc ! glimagesink"))
>>
>> for player in players:
>> player.set_state(gst.STATE_PLAYING)
>>
>> app = wx.App(redirect=False)
>> frame = wx.Frame(None)
>> frame.Show()
>> app.MainLoop()
>>
>> This code crashes a lot with various errors:
>> - 0xc0000005 exceptions
>> - fatal flex scanner internal error--end of buffer missed
>> - (python.exe:2788): GstGLShader-WARNING **: Fragment Shader
>> compilation failed: ERROR: 0:1: 'float' : syntax error parse error
>>
>> Sometimes, however, it runs OK.
>>
>> To me it looks like some bug in glimagesink having something to do
>> with thread safety. Anyone have any ideas what might be the cause of
>> this strange behaviour and how to get rid of it?
>>
>> Regards,
>> Aulia Khamil

Julien Isorce

Re: possible glimagesink bug - not thread safe?

2010/7/25 Aulia Khamil <[hidden email]>

I was running it on Windows Vista using latest GStreamer WinBuilds
0.10.6 (gstreamer-0.10.28, gst-plugins-base-0.10.28,
gst-plugins-gl-0.10.1) and Python 2.6.4.

Same except for me this is winXP and gst-plugins-gl from git.
I am going to send you the binary file the latest gst-gl for testing, in a separate email.
Julien

As a temporary fix I replaced glimagesink with dshowvideosink - works fine.

Regards,
Aulia Khamil

2010/7/24 Julien Isorce <[hidden email]>:

> Hi,
>
> Right now I can't test your exact example on linux I guess ?
>
> But I have tested this one on Windows with no problems:
>
> --------------------------------
> import gobject
> import pygst
> pygst.require("0.10")
> print dir(pygst)
> import gst
>
> players = []
> for i in range(10):
> players.append(gst.parse_launch("videotestsrc ! glimagesink"))
>
> for player in players:
> player.set_state(gst.STATE_PLAYING)
>
> gobject.MainLoop().run()
> --------------------------------
>
> What's the exact version of your gstreamer (core/base/gl/python) ? Are you
> building it from git or ?
>
> Julien
>
>
> 2010/7/24 Aulia Khamil <[hidden email]>
>>
>> Hello,
>>
>> Consider following Python code, which creates four simple pipelines at
>> the same time:
>>
>> import wx
>> import pygst
>> pygst.require("0.10")
>> import gst
>>
>> players = []
>> for i in range(4):
>> players.append(gst.parse_launch("videotestsrc ! glimagesink"))
>>
>> for player in players:
>> player.set_state(gst.STATE_PLAYING)
>>
>> app = wx.App(redirect=False)
>> frame = wx.Frame(None)
>> frame.Show()
>> app.MainLoop()
>>
>> This code crashes a lot with various errors:
>> - 0xc0000005 exceptions
>> - fatal flex scanner internal error--end of buffer missed
>> - (python.exe:2788): GstGLShader-WARNING **: Fragment Shader
>> compilation failed: ERROR: 0:1: 'float' : syntax error parse error
>>
>> Sometimes, however, it runs OK.
>>
>> To me it looks like some bug in glimagesink having something to do
>> with thread safety. Anyone have any ideas what might be the cause of
>> this strange behaviour and how to get rid of it?
>>
>> Regards,
>> Aulia Khamil

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