Re: gstreamer + pygobject problem

[Christoph Reiter <reiter christoph gmail com>]

On Fri, Jul 7, 2017 at 2:01 AM, Damon Lynch <damonlynch gmail com> wrote:
> Hello,
>
> This code to extract a frame of video works some of the time, but certainly
> not all the time:
>
> https://gist.github.com/damonlynch/630224ac1c472cb73bc17b260e3cc5fb
>
> On a large number of versions of several mainstream Linux distributions, it
> always fails at line 31, the seek operation. I've done some testing with
> various distributions, and what I find puzzling is that the success /
> failure is not necessarily tied to the version of Gstreamer / PyGObject:

I remember that there were problems with the Gst.CLOCK_TIME_NONE
constant and how that's handled with get_state some time ago, not sure
if that's still the case. Try passing "Gst.SECOND * 10" or something
instead.

> Ubuntu 16.04: Gstreamer 1.8.3 PyGObject 3.20.0 success
> Ubuntu 16.10: Gstreamer 1.8.3 PyGObject 3.22.0. failure
> Ubuntu 17.04: Gstreamer: 1.10.4 PyGObject: 3.22.0 failure
> Ubuntu 17.10: Gstreamer: 1.12.1 PyGObject: 3.24.1 success
> Fedora 24: Gstreamer: 1.8.3 PyGObject: 3.20.1 failure
> Fedora 25: Gstreamer: 1.10.4 PyGObject: 3.22.0 failure
> Korora 25 (Fedora derivative) Gstreamer: 1.10.4 PyGObject: 3.22.0 success
> LinuxMint 18.0 Gstreamer: 1.8.3 PyGObject: 3.20.0 failure
> LinuxMint 18.1: Gstreamer: 1.8.3 PyGObject: 3.20.0 failure
> LinuxMint 18.2: Gstreamer: 1.8.3 PyGObject: 3.20.0 failure
> openSUSE 42.2: Gstreamer: 1.8.3 PyGObject: 3.20.1 failure
> openSUSE Tumbleweed: Gstreamer: 1.12.0 PyGObject: 3.24.1 failure
> Debian 9: Gstreamer: 1.10.4 PyGObject: 3.22.0 success
>
> What's going on here? Can the python function be modified so that it works
> all the time?
>
> Thanks.
>
> Damon
>
> --
> http://www.damonlynch.net
>
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