Video processing - Revision history

Leo: /* Webcam parameters */

2016-04-18T05:26:21Z

‎Webcam parameters

2016-04-10T00:24:37Z

‎Screencast: Screen recording on Linux

2016-04-07T05:03:45Z

‎Screencast: Screen recording on Linux

2016-04-07T05:02:37Z

‎Recordmydesktop

2016-04-07T04:59:30Z

‎OBS - Open Broadcast

2016-04-07T04:57:37Z

‎Screencast: Screen recording on Linux

2016-04-05T03:22:14Z

2016-04-01T02:54:05Z

‎Recordmydesktop

2016-04-01T02:52:24Z

‎Command line: avconv

2016-04-01T02:50:20Z

@@ Line 18: / Line 18: @@
  v4l2ucp
+==== c920 and h264 stream ====
+There is a trick to use the native h264 stream from Logitec c920 webcam.
+Here is [https://wiki.matthiasbock.net/index.php/Logitech_C920,_streaming_H.264 the wiki that talks about that].
+Here is an example from command line:
+# Set camera pixel format
+# Test the output with VLC, without resetting the settings
+# Test the output with VLC, with resetting the settings
+# Stream the video
+ v4l2-ctl --device=/dev/video0 --set-fmt-video=width=800,height=600,pixelformat=1
+ cvlc v4l2:///dev/video1 --demux h264
+ cvlc v4l2:///dev/video1:chroma=h264
+ cvlc v4l2:///dev/video1:chroma=h264:width=800:height=600 --sout '#standard{access=http,mux=ts,dst=localhost:8080,name=stream,mime=video/ts}' -vvv
 = Screencast: Screen recording on Linux =

@@ Line 11: / Line 11: @@
 * [[Leo:Blender | Blender]] - Excellent tool that also has video sequence editor with all sorts of tricks. [[Leo:Blender | My notes here]]
+= Webcam parameters =
+Video for Linux has a command line tool with many parameters, but also a GUI frontend that allows for adjusting the webcam parameters before the capture or streaming:
+ v4l2ucp

@@ Line 20: / Line 20: @@
 [https://obsproject.com/ Website here] - a fairly sophisticated tool that allows recording and streaming a mix of multiple streams. Has a studio window where one can move, zoom, and arrange order for overlaying video sources, and mix in one or several audio. Uses ffmpg under the hood, so that will have to be installed. Multiplatform.
+=== Kazam ===
+A simple and minimal video capture software. Can mix audio sources. Does the job for me.
 === avconv ===
@@ Line 39: / Line 43: @@
 === gtk-recordmydesktop ===
-This is a GUI frontend for recordmydektop
+This is a GUI frontend for recordmydektop (discontinued, although still available from repos)
-=== Kazam ===
-A simple and minimal video capture software. Can mix audio sources. Does the job for me.
 === Other options ===

@@ Line 34: / Line 34: @@
 === Recordmydesktop ===
+Discontinued (since 2009)?
 A nice command line tool. However, it cannot easily mix audio sources. Sample command here:
  recordmydesktop --width 1920 --height 1200 --full-shots --fps 15 --channels 1 --device hw:1,0 --delay 10

@@ Line 17: / Line 17: @@
 Several tools can do that. Here is the list and my comments:
-=== OBS - Open Broadcast ===
+=== OBS - Open Broadcaster Software ===
-[https://obsproject.com/ Website here] - a fairly sophisticated tool that allows recording and streaming a mix of multiple streams. Has a studio window where one can move, zoom, and arrange order for overlaying video sources, and mix in one or several audio. Uses ffmpg under the hood, so that will have to be installed. Multi platform.
+[https://obsproject.com/ Website here] - a fairly sophisticated tool that allows recording and streaming a mix of multiple streams. Has a studio window where one can move, zoom, and arrange order for overlaying video sources, and mix in one or several audio. Uses ffmpg under the hood, so that will have to be installed. Multiplatform.
 === avconv ===

@@ Line 16: / Line 16: @@
 Several tools can do that. Here is the list and my comments:
+=== OBS - Open Broadcast ===
+[https://obsproject.com/ Website here] - a fairly sophisticated tool that allows recording and streaming a mix of multiple streams. Has a studio window where one can move, zoom, and arrange order for overlaying video sources, and mix in one or several audio. Uses ffmpg under the hood, so that will have to be installed. Multi platform.
 === avconv ===
@@ Line 43: / Line 49: @@
 * Camtasia
 * Screenflow
 = Webcam =

@@ Line 1: / Line 1: @@
 {{TocRight}}
 Notes about recording and post-processing video on Linux.
+= Video editors =
+* avidemux - tool for processing video streams. Plenty of filters of all kinds. A bit outdated for newer formats.
+* Handbrake - multiplatform video converter simple to use and quite reliable.
+* Openshot - included with ubuntu, fairly basic and simple video sequence editor.
+* [[Leo:Blender | Blender]] - Excellent tool that also has video sequence editor with all sorts of tricks. [[Leo:Blender | My notes here]]
 = Screencast: Screen recording on Linux =
@@ Line 40: / Line 51: @@
  mplayer -tv driver=v4l2:width=320:height=240:device=/dev/video0 -vo xv tv:// -geometry "99%:90%" -noborder -ontop
+Another example, HD size video, with window handle so it can me moved:
+ mplayer -tv driver=v4l2:width=1280:height=720:device=/dev/video0 -vo xv tv:// -geometry "45%:1%" -ontop
+===Cheese===
+A very simple and limited webcam image and video preview and capture tool.

@@ Line 5: / Line 5: @@
 Several tools can do that. Here is the list and my comments:
-=== Command line: avconv ===
+=== avconv ===
-This works OK, except I am sometimes getting chopped audio. Must be synchronization issue.
+This is a versatile command line tool. It works OK, except I am sometimes getting chopped audio. Must be synchronization issue.
- /usr/bin/avconv -f alsa -ac 2 -i default -f x11grab -r 15 -s 854x508 -i :0.0+144,24 -vcodec libx264 -preset ultrafast -crf 0 -threads 0 -acodec pcm_s16le cap6.mkv
+ avconv -f alsa -ac 2 -i default -f x11grab -r 30 -s 854x508 -i :0.0+144,24 -vcodec libx264 -preset ultrafast -crf 0 -threads 0 -acodec pcm_s16le cap6.mkv
+BTW, before avconv there was ffmpeg used for this. Most options compatible.
 === Vokoscreen ===