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Improve mixing
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Matthew Clark
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@ -7,6 +7,7 @@ This series of docs provides a cheat sheet for Gstreamer on the command-line.
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* [Test streams](test_streams.md)
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* [Basics](basics.md)
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* [RTMP](rtmp.md)
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* [Mixing video](mixing.md)
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## Sources and references
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89
basics.md
89
basics.md
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@ -2,55 +2,66 @@
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## Playing content
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For these,set `SRC` to be e.g. an mp4 file., e.g.
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```
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export SRC=/home/me/videos/test.mp4
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```
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### Play a video (with audio)
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```
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gst-launch-1.0 -v playbin uri=file:///Users/clarkm22/workspace/silver/assets/20160920-184500-danger-mouse-h264lg.mp4
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gst-launch-1.0 -v playbin uri=file://$SRC
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```
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or another way
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or, if you'd rather have more control of the pipeline:
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```
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gst-launch-1.0 filesrc location=/Users/clarkm22/workspace/silver/assets/20160920-184500-danger-mouse-h264lg.mp4 ! qtdemux name=demux demux.audio_0 ! queue ! decodebin ! audioconvert ! audioresample ! autoaudiosink demux.video_0 ! queue ! decodebin ! videoconvert ! videoscale ! autovideosink
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gst-launch-1.0 filesrc location=$SRC ! \
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qtdemux name=demux demux.audio_0 ! queue ! decodebin ! audioconvert ! audioresample ! \
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autoaudiosink \
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demux.video_0 ! queue ! \
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decodebin ! videoconvert ! videoscale ! autovideosink
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```
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### Play a video (no audio)
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```
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gst-launch-1.0 -v uridecodebin uri="file:///Users/clarkm22/workspace/silver/assets/20160920-184500-danger-mouse-h264lg.mp4" ! autovideosink
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gst-launch-1.0 -v uridecodebin uri="file://$SRC" ! autovideosink
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```
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which could also have been done as:
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```
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gst-launch-1.0 -v filesrc location="/Users/clarkm22/workspace/silver/assets/20160920-184500-danger-mouse-h264lg.mp4" ! decodebin ! autovideosink
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gst-launch-1.0 -v filesrc location="$SRC" ! decodebin ! autovideosink
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```
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To play a video (just audio, no video):
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### Play just the audio from a video
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```
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gst-launch-1.0 -v uridecodebin uri="file:///Users/clarkm22/workspace/silver/assets/20160920-184500-danger-mouse-h264lg.mp4" ! autoaudiosink
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gst-launch-1.0 -v uridecodebin uri="file://$SRC" ! autoaudiosink
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```
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Audio visualisation:
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### Visualise the audio:
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```
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gst-launch-1.0 filesrc location=/Users/clarkm22/workspace/silver/assets/20160920-184500-danger-mouse-h264lg.mp4 ! qtdemux name=demux demux.audio_0 ! queue ! decodebin ! audioconvert ! wavescope ! autovideosink
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gst-launch-1.0 filesrc location=$SRC ! qtdemux name=demux demux.audio_0 ! queue ! decodebin ! audioconvert ! wavescope ! autovideosink
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```
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(or replace ‘wavescope’ with ‘spectrascope’ or ‘synaescope’ or ‘spacescope’)
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(or replace `‘wavescope` with `spectrascope` or `synaescope` or `spacescope`)
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Or even better visualisation:
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```
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gst-launch-1.0 filesrc location=/Users/clarkm22/workspace/silver/assets/20160920-184500-danger-mouse-h264lg.mp4 ! decodebin ! tee name=t ! queue ! audioconvert ! wavescope style=color-lines shade-amount=0x00080402 ! alpha alpha=0.5 ! videomixer name=m background=black ! videoconvert ! vertigotv ! autovideosink t. ! queue ! audioconvert ! spacescope style=color-lines shade-amount=0x00080402 ! alpha alpha=0.5 ! m. t. ! queue ! autoaudiosink
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gst-launch-1.0 filesrc location=$SRC ! decodebin ! tee name=t ! queue ! audioconvert ! wavescope style=color-lines shade-amount=0x00080402 ! alpha alpha=0.5 ! videomixer name=m background=black ! videoconvert ! vertigotv ! autovideosink t. ! queue ! audioconvert ! spacescope style=color-lines shade-amount=0x00080402 ! alpha alpha=0.5 ! m. t. ! queue ! autoaudiosink
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```
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### Add filters
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Go slightly mad:
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```
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gst-launch-1.0 -v filesrc location="/Users/clarkm22/workspace/silver/assets/20160920-184500-danger-mouse-h264lg.mp4" ! decodebin ! videoconvert ! vertigotv ! autovideosink
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gst-launch-1.0 -v filesrc location="$SRC" ! decodebin ! videoconvert ! vertigotv ! autovideosink
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```
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Try also ‘rippletv’, ‘streaktv’, ‘radioactv’, ‘optv’, ‘quarktv’, ‘revtv’, ‘shagadelictv’, ‘warptv’ (I like), ‘dicetv’, ‘agingtv’ (great), ‘edgetv’ (could be great on real stuff)
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@ -58,66 +69,20 @@ Try also ‘rippletv’, ‘streaktv’, ‘radioactv’, ‘optv’, ‘quarktv
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### Resize video
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```
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gst-launch-1.0 -v filesrc location="/Users/clarkm22/workspace/silver/assets/20160920-184500-danger-mouse-h264lg.mp4" ! decodebin ! videoconvert ! videoscale ! video/x-raw,width=100 ! autovideosink
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gst-launch-1.0 -v filesrc location="$SRC" ! decodebin ! videoconvert ! videoscale ! video/x-raw,width=100 ! autovideosink
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```
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### Change framerate
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```
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gst-launch-1.0 -v filesrc location="/Users/clarkm22/workspace/silver/assets/20160920-184500-danger-mouse-h264lg.mp4" ! decodebin ! videoconvert ! videorate ! video/x-raw,framerate=5/1 ! autovideosink
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gst-launch-1.0 -v filesrc location="$SRC" ! decodebin ! videoconvert ! videorate ! video/x-raw,framerate=5/1 ! autovideosink
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```
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And of course you can resize the video and change the framerate:
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```
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gst-launch-1.0 -v \
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filesrc location="/Users/clarkm22/workspace/silver/assets/20160920-184500-danger-mouse-h264lg.mp4” ! \
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filesrc location="$SRC” ! \
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decodebin ! videoconvert ! videoscale ! video/x-raw,width=100 ! videorate ! video/x-raw,framerate=5/1 ! \
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autovideosink
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```
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### Picture in picture
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```
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gst-launch-1.0 \
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filesrc location="/Users/clarkm22/workspace/silver/assets/20161017-224500-match-of-the-day-2-h264lg.mp4" ! \
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decodebin ! videoconvert ! \
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videoscale ! video/x-raw,width=640,height=360 ! \
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videomixer name=mix sink_0::alpha=1 sink_1::alpha=1 ! \
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videoconvert ! autovideosink \
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filesrc location="/Users/clarkm22/workspace/silver/assets/20160920-184500-danger-mouse-h264lg.mp4" ! \
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decodebin ! videoconvert ! \
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videoscale ! video/x-raw,width=320,height=180! \
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mix.
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```
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Put a box around the in-picture using ‘videobox’ e.g.
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```
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gst-launch-1.0 \
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filesrc location="/Users/clarkm22/workspace/silver/assets/20161017-224500-match-of-the-day-2-h264lg.mp4" ! \
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decodebin ! videoconvert ! \
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videoscale ! video/x-raw,width=640,height=360 ! \
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videomixer name=mix sink_0::alpha=1 sink_1::alpha=1 ! \
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videoconvert ! autovideosink \
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filesrc location="/Users/clarkm22/workspace/silver/assets/20160920-184500-danger-mouse-h264lg.mp4" ! \
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decodebin ! videoconvert ! \
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videoscale ! video/x-raw,width=320,height=180! \
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videobox border-alpha=0 top=-10 bottom=-10 right=-10 left=-10 ! \
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mix.
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```
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Choose where the in-picture goes with the ‘xpos’ and ‘ypos’ attributes of videomixer, e.g.
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```
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gst-launch-1.0 \
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filesrc location="/Users/clarkm22/workspace/silver/assets/20161017-224500-match-of-the-day-2-h264lg.mp4" ! \
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decodebin ! videoconvert ! \
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videoscale ! video/x-raw,width=640,height=360 ! \
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videomixer name=mix sink_0::alpha=1 sink_1::alpha=1 sink_1::xpos=50 sink_1::ypos=50 ! \
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videoconvert ! autovideosink \
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filesrc location="/Users/clarkm22/workspace/silver/assets/20160920-184500-danger-mouse-h264lg.mp4" ! \
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decodebin ! videoconvert ! \
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videoscale ! video/x-raw,width=320,height=180! \
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mix.
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```
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50
mixing.md
Normal file
50
mixing.md
Normal file
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@ -0,0 +1,50 @@
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# Mixing video (GStreamer command-line cheat sheet)
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### Picture in picture
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Here we have two source (mp4) files, which should be set as environment variables `$SRC` and `$SRC2`
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```
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gst-launch-1.0 \
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filesrc location="$SRC2" ! \
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decodebin ! videoconvert ! \
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videoscale ! video/x-raw,width=640,height=360 ! \
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videomixer name=mix sink_0::alpha=1 sink_1::alpha=1 ! \
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videoconvert ! autovideosink \
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filesrc location="$SRC" ! \
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decodebin ! videoconvert ! \
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videoscale ! video/x-raw,width=320,height=180! \
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mix.
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```
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Put a box around the in-picture using ‘videobox’ e.g.
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```
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gst-launch-1.0 \
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filesrc location="$SRC2" ! \
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decodebin ! videoconvert ! \
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videoscale ! video/x-raw,width=640,height=360 ! \
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videomixer name=mix sink_0::alpha=1 sink_1::alpha=1 ! \
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videoconvert ! autovideosink \
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filesrc location="$SRC" ! \
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decodebin ! videoconvert ! \
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videoscale ! video/x-raw,width=320,height=180! \
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videobox border-alpha=0 top=-10 bottom=-10 right=-10 left=-10 ! \
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mix.
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```
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Choose where the in-picture goes with the ‘xpos’ and ‘ypos’ attributes of videomixer, e.g.
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```
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gst-launch-1.0 \
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filesrc location="$SRC2" ! \
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decodebin ! videoconvert ! \
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videoscale ! video/x-raw,width=640,height=360 ! \
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videomixer name=mix sink_0::alpha=1 sink_1::alpha=1 sink_1::xpos=50 sink_1::ypos=50 ! \
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videoconvert ! autovideosink \
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filesrc location="$SRC" ! \
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decodebin ! videoconvert ! \
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videoscale ! video/x-raw,width=320,height=180! \
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mix.
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```
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