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2.5 KiB
2.5 KiB
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 $SRC2
gst-launch-1.0 \
filesrc location="$SRC2" ! \
decodebin ! videoconvert ! \
videoscale ! video/x-raw,width=640,height=360 ! \
compositor name=mix sink_0::alpha=1 sink_1::alpha=1 ! \
videoconvert ! autovideosink \
filesrc location="$SRC" ! \
decodebin ! videoconvert ! \
videoscale ! video/x-raw,width=320,height=180! \
mix.
Put a box around the in-picture using ‘videobox’ e.g.
gst-launch-1.0 \
filesrc location="$SRC2" ! \
decodebin ! videoconvert ! \
videoscale ! video/x-raw,width=640,height=360 ! \
compositor name=mix sink_0::alpha=1 sink_1::alpha=1 ! \
videoconvert ! autovideosink \
filesrc location="$SRC" ! \
decodebin ! videoconvert ! \
videoscale ! video/x-raw,width=320,height=180! \
videobox border-alpha=0 top=-10 bottom=-10 right=-10 left=-10 ! \
mix.
Choose where the in-picture goes with the ‘xpos’ and ‘ypos’ attributes of videomixer, e.g.
gst-launch-1.0 \
filesrc location="$SRC2" ! \
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="$SRC" ! \
decodebin ! videoconvert ! \
videoscale ! video/x-raw,width=320,height=180! \
mix.
Add audio by demuxing the inputs so it can be handled separately. This example does so on the first source (rather than mixing the two together):
gst-launch-1.0 \
filesrc location="$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.