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Move to compositor and add audio example

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Matthew Clark 2018-02-23 08:07:36 +00:00
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mixing.md
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@ -1,5 +1,9 @@
# Mixing video (GStreamer command-line cheat sheet)
The element `compositor` allows video to be mixed (overlayed, put side-by-side, etc).
The older `videomixer` element can be used instead, and takes the same arguments as `compositor` so it's easy to swap between them. However, `videomixer` is apparently inferior in some situations, such as for live streams.
### Picture in picture
Here we have two source (mp4) files, which should be set as environment variables `$SRC` and `$SRC2`
@ -9,7 +13,7 @@ gst-launch-1.0 \
filesrc location="$SRC2" ! \
decodebin ! videoconvert ! \
videoscale ! video/x-raw,width=640,height=360 ! \
videomixer name=mix sink_0::alpha=1 sink_1::alpha=1 ! \
compositor name=mix sink_0::alpha=1 sink_1::alpha=1 ! \
videoconvert ! autovideosink \
filesrc location="$SRC" ! \
decodebin ! videoconvert ! \
@ -24,7 +28,7 @@ gst-launch-1.0 \
filesrc location="$SRC2" ! \
decodebin ! videoconvert ! \
videoscale ! video/x-raw,width=640,height=360 ! \
videomixer name=mix sink_0::alpha=1 sink_1::alpha=1 ! \
compositor name=mix sink_0::alpha=1 sink_1::alpha=1 ! \
videoconvert ! autovideosink \
filesrc location="$SRC" ! \
decodebin ! videoconvert ! \
@ -40,7 +44,7 @@ gst-launch-1.0 \
filesrc location="$SRC2" ! \
decodebin ! videoconvert ! \
videoscale ! video/x-raw,width=640,height=360 ! \
videomixer name=mix sink_0::alpha=1 sink_1::alpha=1 sink_1::xpos=50 sink_1::ypos=50 ! \
compositor name=mix sink_0::alpha=1 sink_1::alpha=1 sink_1::xpos=50 sink_1::ypos=50 ! \
videoconvert ! autovideosink \
filesrc location="$SRC" ! \
decodebin ! videoconvert ! \
@ -48,3 +52,25 @@ gst-launch-1.0 \
mix.
```
---
Add audio by demuxing the inputs so it can be handled separately. This example does so on the first source (rather than mixing the two together):
```
gst-launch-1.0 \
filesrc location="$SRC" ! \
qtdemux name=demux demux.audio_0 ! queue ! decodebin ! audioconvert ! audioresample ! \
autoaudiosink \
demux.video_0 ! queue ! \
decodebin ! videoconvert ! \
videoscale ! video/x-raw,width=640,height=360 ! \
compositor name=mix sink_0::alpha=1 sink_1::alpha=1 sink_1::xpos=50 sink_1::ypos=50 ! \
videoconvert ! autovideosink \
filesrc location="$SRC2" ! \
decodebin ! videoconvert ! \
videoscale ! video/x-raw,width=320,height=180! \
mix.
```