Hi * while reading some code, I came accross these lines: ffmpeg/libavcodec/oggtheora.c -> line 115-116 ctx->time_base.num = thc->info.fps_denominator; ctx->time_base.den = thc->info.fps_numerator; actually I didn't use theora (ffmpeg -i file.mpg file.ogg does not find the codec), so I can not verify wether the coder is ok or not. Tom