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mplayer snapshot commands not working

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Special Forums UNIX and Linux Applications mplayer snapshot commands not working
# 1  
Old 04-30-2012
mplayer snapshot commands not working
About 8-12 months ago I wrote a script that pulled together several mplayer commands to perform various activities. One allowed me to press the s-key to take snapshots with my webcam. Useful for recording the sensors I build.
Now it:
Code:
vd=0
bash-4.1$ TV1="-tv driver=v4l2:device=/dev/video${vd}:width=320:height=240"
bash-4.1$ TV2="norm=NTSC:chanlist=us-cable:input=0:noaudio:outfmt=i420"
bash-4.1$ OUT="-fps 30 -cache 128"
bash-4.1$ PIC="-hue 0  -brightness 0  -contrast 0  -saturation 0 -aspect 4:3"
bash-4.1$ mplayer tv:// $TV1:$TV2 $OUT $PIC -vf screenshot -vo xv,x11

no longer works under Slackware 13.37 and mplayer (phonon-mplayer-20101213-i486-1).

I scanned the web for working commands and what I found also does not work:
Code:
1) mplayer tv:// -tv driver=v4l2:width=640:height=480:outfmt=rgb24:device=/dev/video0 -fps 15 -vo png
2) mplayer tv:// -tv driver=v4l2:device=/dev/video0 -vo png:z=9 -frames 1
3) mplayer -vo png -frames 1 tv://
4) mplayer tv:// -vf-pre pp=hb:a/vb:a/dr:a/al:a,hqdn3d -tv   driver=v4l2:device=/dev/video0:width=640:height=480:noaudio

Most yielded:
Code:
tv.c: norm_from_string(pal): Bogus norm parameter, setting default.
v4l2: ioctl enum norm failed: Invalid argument
Error: Cannot set norm!
Selected input hasn't got a tuner!
v4l2: Cannot get fps
v4l2: ioctl set mute failed: Invalid argument
v4l2: ioctl query control failed: Invalid argument
Cannot find codec matching selected -vo and video format 0x31384142.

My initial command produces:
Code:
v4l2: your device driver does not support VIDIOC_G_STD ioctl, VIDIOC_G_PARM was used instead.
Selected device: SN9C1xx PC Camera
 Capabilities:  video capture  read/write  streaming
 supported norms:
 inputs: 0 = Camera;
 Current input: 0
 Current format: unknown (0x31384142)
tv.c: norm_from_string(NTSC): Bogus norm parameter, setting default.
v4l2: ioctl enum norm failed: Invalid argument
Error: Cannot set norm!
Selected input hasn't got a tuner!
v4l2: Cannot get fps
v4l2: ioctl set mute failed: Invalid argument
v4l2: ioctl query control failed: Invalid argument
v4l2: ioctl query control failed: Invalid argument
v4l2: ioctl query control failed: Invalid argument
v4l2: ioctl query control failed: Invalid argument
Opening video filter: [screenshot]
==========================================================================
 Cannot find codec matching selected -vo and video format 0x31384142.
==========================================================================

v4l2: select timeout
v4l2: ioctl set mute failed: Invalid argument
v4l2: 0 frames successfully processed, 1 frames dropped.

for vd=1 as well.
I am currently using Slackware 13.37. Under 13.0 there was a problem of /dev/video0 and /dev/video1 getting assignments exchanged on different boots. Since the webcam should not have a tuner that error is suspicious.
The video format 0x31384142 is not one which I have seen before. The inability to set norm to NTSC and getting fps is also questioned.
Anyone see a failing? Suggestions & comments welcomed.
Last edited by Corona688; 04-30-2012 at 12:49 PM..
# 2  
Old 06-20-2012
it also depend on the version and what sought of commands you are giving
This is what I don`t get. you installed Mplayer by ppa ,so all those packages marked with the red dot in theory Another point is my distro is not a normal 8.04 , it is built especially for the machine I`m using. mainframe application modernization I run a Reelbox which is a multimedia kinda pc and there are some extra packages added which a normal 8.04 wouldn`t have.
Last edited by timitiwinkle; 06-24-2012 at 10:57 AM..
# 3  
Old 06-22-2012
I won't attempt to understand how Reelbox is created/configured as I have enough with Slackware. I think we can both be confident that the respective boxes are properly built and configured. If we accept that I am curious what results U obtained from running any/all of the 5 Mplayer commands as I have been told each works and that the unnumbered one which I listed did work on my earlier version. I suspect the numbered versions were used with web cams and a filled out configuration file. I am running with no command options being available from the system directed /etc/mplayer/mplayer.conf nor users .mplayer/conf (except for alang, slang, (each is =en) and cache=8192 configuration files. Thanx
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