Creating a log file for my ffmpeg output

Question

I am trying to find out why my rtsp dos command using FFMPEG is 'freezing'. Ihave been told I would have more luck on SuperUser but I have been told to produce a log file 1st.

I have looked and I have tried several things to produce this log file.

My original command line was this:

ffmpeg.exe  -i rtsp://admin:[email protected]:554/video_1 -an -f image2pipe -vf fps=fps=6 -qscale 0 -

and changed it to this:

ffmpeg.exe  -i rtsp://admin:[email protected]:554/video_1 -an -f image2pipe -vf fps=fps=6 -qscale 0 - > log.txt

But the DOS does not get beyond this:

and the log file is empty.

Please can someone advise?

Thanks

Solution

ffmpeg logs to stderr, so you have to check that. Since you're already outputting to stdout, you have to redirect stderr to a file, for example:

ffmpeg … 2> log.txt

Comments

[slhck]

ffmpeg logs to stderr, so you have to check that. Redirect 2> to a file.

[Andrew Simpson]

I am sure I tried that already but will give it another go when I am back. Thanks

[slhck]

Well, I guess it worked.

[slhck]

No problem :) I just wasn't sure as I didn't have a Windows instance to test.

[user25]

what about android?