user4658: I recorded a video chat session with recordmydesktop in linux, but it is somehow defective. I give more details in a (big) footnote down here. I badly need to repair and play that video.
Please put me in the right direction, what should I learn about, which internet sites provide that information, and any clue on what you should thing the problem could be. I don't shy away from doing any learning efforts, but the question of Video Production is just too wide. Any help on narrowing the search for the probable cause would be very helpful.

This is the capture of the konsole during the recording:

inma:~> recordmydesktop
Initial recording window is set to:
X:0   Y:0    Width:1366    Height:768
Adjusted recording window is set to:
X:6   Y:0    Width:1354    Height:768
Your window manager appears to be KWin
Initializing...
Buffer size adjusted to 4096 from 4096 frames.
Opened PCM device default
Recording on device default is set to:
1 channels at 22050Hz
Capturing!
^CShutting down.

Cached 72482 MB, from 215345 MB that were received.
Average cache compression ratio: 66.3 %

Saved 54287 frames in a total of 54245 requests
....
STATE:ENCODING
Encoding started!
This may take several minutes.
Pressing Ctrl-C will cancel the procedure (resuming will not be
  possible, but any portion of the video, which is already encoded won't
  be deleted).
Please wait...
Output file: out.ogv
[89%]   [Cache File 141]
Encoding finished!
Wait a moment please...
Done.
Written 921301705 bytes
(885658169 of which were video data and 35643536 audio data)
Cleanning up cache...
Done!!!
Goodbye!

But now I try to play the file:

inma:~> mplayer out.ogv 
MPlayer svn r34540 (Ubuntu), built with gcc-4.6 (C) 2000-2012 MPlayer
  Team
mplayer: could not connect to socket
mplayer: No such file or directory
Failed to open LIRC support. You will not be able to use your remote
  control.
Playing out.ogv.                                                      
libavformat version 53.21.1 (external)
Mismatching header version 53.19.0
libavformat file format detected.
[ogg @ 0x2b4a70f82940]Codec not found
[ogg @ 0x2b4a70f82940]Codec not found
LAVF_header: av_open_input_stream() failed
Ogg : Warning found none bos page from unknown stream 1091944242
libavformat file format detected.
[ogg @ 0x2b4a70f82940]Codec not found
[ogg @ 0x2b4a70f82940]Codec not found
LAVF_header: av_open_input_stream() failed
Exiting... (End of file)

What is happeing with this recording? Will

user2836: It appears you do not have the necessary codec to play the video in mplayer. You will need to find a codec that can decode it. I can't tell from the posted information what codec it is.

4658: <p>I recorded a video chat session with recordmydesktop in linux, but it is somehow defective. I give more details in a (big) footnote down here. I badly need to repair and play that video.</p>

<p>Please put me in the right direction, what should I learn about, which internet sites provide that information, and any clue on what you should thing the problem could be. I don't shy away from doing any learning efforts, but the question of Video Production is just too wide. Any help on narrowing the search for the probable cause would be very helpful.</p>

<hr>

<p>This is the capture of the konsole during the recording:</p>

<blockquote>
  <p>inma:~> recordmydesktop</p>
  
  <p>Initial recording window is set to:</p>
  
  <p>X:0   Y:0    Width:1366    Height:768</p>
  
  <p>Adjusted recording window is set to:</p>
  
  <p>X:6   Y:0    Width:1354    Height:768</p>
  
  <p>Your window manager appears to be KWin</p>
  
  <p>Initializing...</p>
  
  <p>Buffer size adjusted to 4096 from 4096 frames.</p>
  
  <p>Opened PCM device default</p>
  
  <p>Recording on device default is set to:</p>
  
  <p>1 channels at 22050Hz</p>
  
  <p>Capturing!</p>
  
  <p>^CShutting down.</p>
  
  <hr>
  
  <p>Cached 72482 MB, from 215345 MB that were received.</p>
  
  <p>Average cache compression ratio: 66.3 %</p>
  
  <hr>
  
  <p>Saved 54287 frames in a total of 54245 requests</p>
  
  <p>....</p>
  
  <p>STATE:ENCODING</p>
  
  <p>Encoding started!</p>
  
  <p>This may take several minutes.</p>
  
  <p>Pressing Ctrl-C will cancel the procedure (resuming will not be
  possible, but any portion of the video, which is already encoded won't
  be deleted).</p>
  
  <p>Please wait...</p>
  
  <p>Output file: out.ogv</p>
  
  <p>[89%]   [Cache File 141]</p>
  
  <p>Encoding finished!</p>
  
  <p>Wait a moment please...</p>
  
  <p>Done.</p>
  
  <p>Written 921301705 bytes</p>
  
  <p>(885658169 of which were video data and 35643536 audio data)</p>
  
  <p>Cleanning up cache...</p>
  
  <p>Done!!!</p>
  
  <p>Goodbye!</p>
</blockquote>

<p>But now I try to play the file:</p>

<blockquote>
  <p>inma:~> mplayer out.ogv </p>
  
  <p>MPlayer svn r34540 (Ubuntu), built with gcc-4.6 (C) 2000-2012 MPlayer
  Team</p>
  
  <p>mplayer: could not connect to socket</p>
  
  <p>mplayer: No such file or directory</p>
  
  <p>Failed to open LIRC support. You will not be able to use your remote
  control.</p>
  
  <p>Playing out.ogv.                                                      </p>
  
  <p>libavformat version 53.21.1 (external)</p>
  
  <p>Mismatching header version 53.19.0</p>
  
  <p>libavformat file format detected.</p>
  
  <p>[ogg @ 0x2b4a70f82940]Codec not found</p>
  
  <p>[ogg @ 0x2b4a70f82940]Codec not found</p>
  
  <p>LAVF_header: av_open_input_stream() failed</p>
  
  <p>Ogg : Warning found none bos page from unknown stream 1091944242</p>
  
  <p>libavformat file format detected.</p>
  
  <p>[ogg @ 0x2b4a70f82940]Codec not found</p>
  
  <p>[ogg @ 0x2b4a70f82940]Codec not found</p>
  
  <p>LAVF_header: av_open_input_stream() failed</p>
  
  <p>Exiting... (End of file)</p>
</blockquote>

<p>What is happeing with this recording? Will</p>
 2836: <p>It appears you do not have the necessary codec to play the video in mplayer. You will need to find a codec that can decode it. I can't tell from the posted information what codec it is.</p>
