wmv3 video track produced by GoToMeeting is transcoded to 1000 FPS h264
|Reported by:||almson||Owned by:|
|Blocking:||Reproduced by developer:||no|
|Analyzed by developer:||no|
Summary of the bug:
GoToMeeting produces screencaptures with wmv3 codec at a very low framerate (less than 1 fps). When transcoding to a different video format (like h264), ffmpeg makes a decision about what framerate to use for output. Unfortunately, instead of choosing something sane like 30 or 60, it chooses 1000. If the option -r 30 is added, transcoding works well.
This is a big issue at my company, because we try to accept videos in any format and transcode them to h264 while preserving their framerate. This codec comes up a significant percent of the time. If you know of a workaround that would preserve the framerate for other videos, please let us know!
How to reproduce:
% ffmpeg -i gotomeeting_screencapture.wmv -vcodec h264 -preset veryfast -acodec mp3 -f mp4 -y output.mp4 ffmpeg version 2.8.6-1ubuntu2 Copyright (c) 2000-2016 the FFmpeg developers built with gcc 5.3.1 (Ubuntu 5.3.1-11ubuntu1) 20160311 also affects ffmpeg version N-53104-g0910488-static http://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2016 the FFmpeg developers built with gcc 5.3.1 (Debian 5.3.1-8) 20160205
I've uploaded gotomeeting_screencapture.wmv to the FTP_