GES-Selecting Audio Stream

[Thibault Saunier]

Hello,

What you are doing is correct, and it used to be broken but should work
just fine in 1.18 thanks to:

https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/commit/09cc8dde0036420932704631f59531a1d84de018

What version of GStreamer are you using?

Regards,

- Thibault


On Wed, Dec 2, 2020 at 9:40 PM Chris Wine <chriswine at gmail.com> wrote:

> Hi, I'm having a problem with selecting the correct audio stream from an
> input file that I'm using with GES. The input file has 1 video stream and 4
> identical (as far as the CAPS are concerned) audio streams. I am currently
> using GStreamer/GES mingw x64 1.18.1 on the Windows platform.
>
> As the documentation suggested, I wrote a signal handler for the
> GESTimeline's "select-tracks-for-object" signal, and I've verified that it
> is working as expected with returning a NULL for GESTrackElements that are
> not the audio stream I want, while returning a GPtrArray with the
> timeline's audio track when it is the audio stream I want.
>
> The problem though is that only the 1st audio stream of the input file is
> ever chosen for the output. I've been looking through the GES source code,
> and it appears that when ges_source_create_topbin in GESSource is called
> for the audio, it will always just look for the first pad created when the
> "pad-added" signal is on uridecodebin is called; this made me wonder if
> something in the creation of uridecodebin itself was supposed to be
> responsible for selecting the correct audio stream. However, the only thing
> I can find there is the "caps" property which does restrict the streams,
> but since my 4 audio streams all have identical CAPS, this doesn't end up
> being a restriction.
>
> My question is first, am I missing something obvious that would make this
> work as expected? If not, aside from code changes to
> GESSource/UriSource/AudioUriSource, is there something tricky I can do like
> finding the uridecodebin, intercepting the pad-added signal before it gets
> to the GESSource, and only letting it through when getting to the pad that
> I want to be connected?
>
> Thank you, responses are much appreciated.
> --Chris
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>


-- 
Thibault Saunier, Igalia - www.igalia.com <http://www.centricular.com>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/gstreamer-devel/attachments/20201203/ad5979f1/attachment.htm>