[FFmpeg-user] extracting images from video: please help me understand output

[lovelove]

lovelove wrote:
> 
> Hi. I am trying to extract 1 image from a video every 10 seconds.
> 
> My command is: ffmpeg.exe -i inputfile.flv -r 0.1 -f image2
> output-%03d.jpeg
> 
> The jpeg output files are as expected. Nevertheless I am wondering if
> everything works correctly, because extraction is slow and in the ffmpeg
> output each timecode (e.g. 00:00:20) is repeated ~5 times before going to
> the next time code (e.g. 00:00:30). Thank you for any remarks/comments.
> 
> ffmpeg output:
> 
> frame=    2 fps=  0 q=2.7 size=      -0kB time=00:00:20.00 bitrate= 
> -0.0kbits/s
> frame=    2 fps=  0 q=2.7 size=      -0kB time=00:00:20.00 bitrate= 
> -0.0kbits/s
> frame=    2 fps=  1 q=2.7 size=      -0kB time=00:00:20.00 bitrate= 
> -0.0kbits/s
> frame=    2 fps=  1 q=2.7 size=      -0kB time=00:00:20.00 bitrate= 
> -0.0kbits/s
> frame=    3 fps=  1 q=1.6 size=      -0kB time=00:00:30.00 bitrate= 
> -0.0kbits/s
> frame=    3 fps=  1 q=1.6 size=      -0kB time=00:00:30.00 bitrate= 
> -0.0kbits/s
> frame=    3 fps=  1 q=1.6 size=      -0kB time=00:00:30.00 bitrate= 
> -0.0kbits/s
> frame=    3 fps=  1 q=1.6 size=      -0kB time=00:00:30.00 bitrate= 
> -0.0kbits/s
> frame=    3 fps=  1 q=1.6 size=      -0kB time=00:00:30.00 bitrate= 
> -0.0kbits/s
> frame=    3 fps=  1 q=1.6 size=      -0kB time=00:00:30.00 bitrate= 
> -0.0kbits/s
> frame=    4 fps=  1 q=1.6 size=      -0kB time=00:00:40.00 bitrate= 
> -0.0kbits/s
> frame=    4 fps=  1 q=1.6 size=      -0kB time=00:00:40.00 bitrate= 
> -0.0kbits/s
> frame=    4 fps=  1 q=1.6 size=      -0kB time=00:00:40.00 bitrate= 
> -0.0kbits/s
> frame=    4 fps=  1 q=1.6 size=      -0kB time=00:00:40.00 bitrate= 
> -0.0kbits/s
> frame=    4 fps=  1 q=1.6 size=      -0kB time=00:00:40.00 bitrate= 
> -0.0kbits/s
> frame=    4 fps=  0 q=1.6 size=      -0kB time=00:00:40.00 bitrate= 
> -0.0kbits/s
> [...]
> 

Any idea why the lines are repeated (same timecode, same frame)? 
Does that mean the output image is overwritten 5 times and thus the process
could be 5 times faster if done right?
Where can I find a explanation/documentation on what FFmpeg output (like
this one) means?

thank you.


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