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Matthew Clark 2018-06-08 21:41:16 +01:00
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queues.md
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@ -21,6 +21,7 @@ gst-launch-1.0 videotestsrc ! queue ! autovideosink
Queues add latency, so the general advice is not to add them unless you need them.
## Queue2
Confusingly, `queue2` is not a replacement for `queue`. It's not obvious when to use one or the other.

36
sharing_and_splitting_pipelines.md
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@ -20,20 +20,20 @@ There are many elements that can achieve this, each with their own pros and cons
_As with the rest of this site, this is a rough guide, and is probably not complete or accurate!_
Name | Description | Points to note | Further reading
---- | ----------- | -------------- | ---------------
*shmsink and shmsrc* | Allows video to be read/written from shared memory | * Used to send/receive from Snowmix | See below
*appsrc/appsink* | Allows video data to leave/enter the pipeline from your own application | n/a | https://thiblahute.github.io/GStreamer-doc/app-1.0/index.html?gi-language=c
*fdsrc/fdsink* | Allows communication via a file descriptor | n/a | https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-plugins/html/gstreamer-plugins-fdsrc.html
*interpipe* | Allows simple communication between two or more independent pipelines. Very powerful. | * Not part of GStreamer (though it is open-source... I'm not sure why it's not been included) | * Well-documented at https://developer.ridgerun.com/wiki/index.php?title=GstInterpipe
* https://gstreamer.freedesktop.org/data/events/gstreamer-conference/2015/Melissa%20Montero%20-%20GST%20Daemon%20and%20Interpipes:%20A%20simpler%20way%20to%20get%20your%20applications%20done%20.pdf
*inter* (intervideosink, etc) | Send/receive AV between two pipelines in the same process | Only support raw audio or video, and drop events and queries at the boundary (source: [Nirbheek's blog](http://blog.nirbheek.in/2018/02/decoupling-gstreamer-pipelines.html)) | * https://thiblahute.github.io/GStreamer-doc/inter-1.0/index.html?gi-language=c
* Pros and cons discussed here: http://gstreamer-devel.966125.n4.nabble.com/How-to-connect-intervideosink-and-intervideosrc-for-IPC-pipelines-td4684567.html
*ipcpipeline* | Allows communication between pipelines *in different processes*. | * Arrived with GStreamer 1.14 (Spring 2018) | https://www.collabora.com/news-and-blog/blog/2017/11/17/ipcpipeline-splitting-a-gstreamer-pipeline-into-multiple-processes/
*gstproxy (proxysink and proxysrc)* | Send/receive AV between two pipelines in the same process. | * Arrived with GStreamer 1.14 (Spring 2018) | * See below
| Name | Description | Points to note | Further reading |
| ---- | ----------- | -------------- | --------------- |
| *shmsink and shmsrc* | Allows video to be read/written from shared memory | * Used to send/receive from Snowmix | See below |
| *appsrc/appsink* | Allows video data to leave/enter the pipeline from your own application | n/a | https://thiblahute.github.io/GStreamer-doc/app-1.0/index.html?gi-language=c |
| *fdsrc/fdsink* | Allows communication via a file descriptor | n/a | https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-plugins/html/gstreamer-plugins-fdsrc.html |
| *interpipe* | Allows simple communication between two or more independent pipelines. Very powerful. | * Not part of GStreamer (though it is open-source... I'm not sure why it's not been included) | * Well-documented at https://developer.ridgerun.com/wiki/index.php?title=GstInterpipe<br>
* https://gstreamer.freedesktop.org/data/events/gstreamer-conference/2015/Melissa%20Montero%20-%20GST%20Daemon%20and%20Interpipes:%20A%20simpler%20way%20to%20get%20your%20applications%20done%20.pdf |
| *inter* (intervideosink, etc) | Send/receive AV between two pipelines in the same process | Only support raw audio or video, and drop events and queries at the boundary (source: [Nirbheek's blog](http://blog.nirbheek.in/2018/02/decoupling-gstreamer-pipelines.html)) | * https://thiblahute.github.io/GStreamer-doc/inter-1.0/index.html?gi-language=c
* Pros and cons discussed here: http://gstreamer-devel.966125.n4.nabble.com/How-to-connect-intervideosink-and-intervideosrc-for-IPC-pipelines-td4684567.html |
| *ipcpipeline* | Allows communication between pipelines *in different processes*. | * Arrived with GStreamer 1.14 (Spring 2018) | https://www.collabora.com/news-and-blog/blog/2017/11/17/ipcpipeline-splitting-a-gstreamer-pipeline-into-multiple-processes/ |
| *gstproxy (proxysink and proxysrc)* | Send/receive AV between two pipelines in the same process. | * Arrived with GStreamer 1.14 (Spring 2018) | * See below
* Introduced by the blog mentioned above (http://blog.nirbheek.in/2018/02/decoupling-gstreamer-pipelines.html)
* Example code on proxysrc here: https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-bad-plugins/html/gst-plugins-bad-plugins-proxysrc.html
* Equivalent proxysink: https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-bad-plugins/html/gst-plugins-bad-plugins-proxysink.html
* Equivalent proxysink: https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-bad-plugins/html/gst-plugins-bad-plugins-proxysink.html |
## Sharing via memory - shmsink and shmsrc
@ -76,7 +76,7 @@ gst-launch-1.0 shmsrc socket-path=/tmp/tmpsock ! \
## gstproxy (proxysink and proxysrc)
I've used *proxysink* and *proxysrc* to split large pipelines into smaller ones. That way, if a part fails, the rest can continue.
I've used `proxysink` and `proxysrc` to split large pipelines into smaller ones. That way, if a part fails, the rest can continue.
It's not possible to use them via the command-line, because you connect them by having the receiver (`proxysrc`) reference the sender (`proxysink`).
@ -89,12 +89,12 @@ A very simple example would be:
This would achieve the same as `audiotestsrc | autoaudiosink`, but in two pipelines.
An Python example of this can be found at [python_examples/gstproxy_01_audiotestsrc/py](python_examples/gstproxy_01_audiotestsrc/py).
An Python example of this can be found at ['python_examples/gstproxy_01_audiotestsrc/py](/python_examples/gstproxy_01_audiotestsrc/py).
A slightly more interesting example can be found at
[python_examples/gstproxy_02_playbin/py](python_examples/gstproxy_02_playbin/py). This plays a video file (e.g. mp4). It shows:
[/python_examples/gstproxy_02_playbin/py](/python_examples/gstproxy_02_playbin/py). This plays a video file (e.g. mp4). It shows:
# that `proxysink` can work with [`playbin`](https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-plugins/html/gst-plugins-base-plugins-playbin.html)
# separate proxies for audio and video
# _TO BE CONFIRMED_ that when the video ends, the other pipelines continue.
* that `proxysink` can work with [`playbin`](https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-plugins/html/gst-plugins-base-plugins-playbin.html)
* separate proxies for audio and video
* that when the video ends, the other pipelines continue.