fixed granularity of video quality when encoding with theora codec

The floating point version of av_clip has to be used when converting the quality level.
Signed-off-by: Maximilian Seesslen <mes@seesslen.net>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/libtheoraenc.c

@@ -212,7 +212,7 @@ static av_cold int encode_init(AVCodecContext* avc_context)
                 * 0 <= p <=63
                 * an int value
          */
-        t_info.quality        = av_clip(avc_context->global_quality / (float)FF_QP2LAMBDA, 0, 10) * 6.3;
+        t_info.quality        = av_clipf(avc_context->global_quality / (float)FF_QP2LAMBDA, 0, 10) * 6.3;
         t_info.target_bitrate = 0;
     } else {
         t_info.target_bitrate = avc_context->bit_rate;