[blimey]

The index of the saved .flv file can be off. This may cause playability issues with some .flv players.

You can remux the file into a .mp4 file quickly without any transcoding, and the index will be correct.

Get FLV Extract and mp4box.

Using FLV Extract, drag the saved .flv file from getflv to the FLV Extract window. It will demux into video and audio files, ending in .264 and .aac

Then, use mp4box to remux those files into an .mp4, like this:

mp4box.exe -add "filename.264:fps=23.976" -add "filename.aac" "filename_output.mp4"

Where "filename" is the name of the .264 and .acc files. The output .mp4 will play properly and have the correct time length.

[blimey]

Those are working for me. Check the command line carefully and also watch the text displayed by mp4box to be sure it is using your input framerate (it defaults to 25). Also check the output video file to be sure the framerate is the same as what you had on the command line.