+ if( av_q2d(codec->time_base) < 0.001 && video_sync_method
+ && (video_sync_method==1 || (video_sync_method<0 && !(os->oformat->flags & AVFMT_VARIABLE_FPS)))){
+ av_log(os, AV_LOG_WARNING, "Frame rate very high for a muxer not effciciently supporting it.\n"
+ "Please consider specifiying a lower framerate, a different muxer or -vsync 2\n");
+ }