Problems with recording video

[Ian Davidson]

I missed a 'done' in my transcription of the script.  I have corrected 
the script below.

On 12/12/2012 16:13, Ian Davidson wrote:
> I am trying to record video.  The recording time can be over an hour 
> and if I try to record to a single file, the file can get too large.
>
> I wrote a script to attempt to record a series of shorter videos - and 
> then use Ctrl-C to stop recording when I wanted to finish. Below is a 
> simplified version of the script.
> #!/bin/bash
> fileNamePart="${HOME}/video"
> v4l2-ctl -i 1
> counter=0
> while [ $counter -lt 100 ]; do
>     let counter=counter+1
>     fullFileName="${fileNamePart}-${counter}.avi"
>     `gst-launch-1.0 v4l2src norm=PAL num-buffers=100 ! 
> 'video/x-raw,format=(string)I420,width=352,height=288,framerate=(fraction)25/1' 
> ! queue ! mux. alsasrc num-buffers=440 ! audioconvert ! 
> 'audio/x-raw,rate=44100,channels=2' ! queue ! mux. avimux name=mux ! 
> filesink location="$fullFileName"`
done
>
> Note that this test version has the num-buffers set to 100 for the 
> video source.  When I run this script for a short while, I get the 
> following on the console
> [ian at localhost ~]$ ./testScript
> Video input set to 1 (Composite1: ok)
> ./testScript: line 8: Setting: command not found
> ./testScript: line 8: Setting: command not found
> ^C
> [ian at localhost ~]$
>
> The first video records without any comment, the second and subsequent 
> attempts get that 'Setting: command not found' message.
>
> The final video - the one that is terminated by the Ctrl-C - does not 
> seem to have recorded the video properly.  When I try to view the 
> videos, that final video does not display the actual material, just a 
> 'filmstrip'.  If I carry the videos from my Linux box to a Windows 
> machine, editors fail to open the final AVI file.
>
> Thus far, two questions.
> 1) What is the meaning of that 'command not found'?
> 2) Why does the final video, terminated by Ctrl-C not work?
>
> I then noticed that I have num-buffers on both the video and audio 
> sources - so I removed the 'num-buffers=440' - but now the first video 
> did not come to a natural end but waited until the Ctrl-C.
>
> Third question. Do I need to have num-buffers on both sources?
>
> Your help is appreciated.
>
> Ian
> -- 
> --
> Ian Davidson
> /239 Streetsbrook Road, Solihull, West Midlands, B91 1HE/
> --
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> resulting from memorisation and subsequent use.
>
>
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-- 
--
Ian Davidson
/239 Streetsbrook Road, Solihull, West Midlands, B91 1HE/
--
Facts used in this message may or may not reflect an underlying 
objective reality. Facts are supplied for personal use only.
Recipients quoting supplied information do so at their own risk. Facts 
supplied may vary in whole or part from widely accepted standards.
While painstakingly researched, facts may or may not be indicative of 
actually occurring events or natural phenomena.
The author accepts no responsibility for personal loss or injury 
resulting from memorisation and subsequent use.
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