In the crop filter, put under ifdef DEBUG the trace logs for the

evaluated crop area coordinates.

Prevent debug log spamming, define the DEBUG symbol for enabling them.

Originally committed as revision 26110 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavfilter/vf_crop.c

@@ -23,6 +23,8 @@
  * video crop filter
  */
 
+/* #define DEBUG */
+
 #include "avfilter.h"
 #include "libavutil/eval.h"
 #include "libavutil/avstring.h"
@@ -262,9 +264,11 @@ static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
     crop->x &= ~((1 << crop->hsub) - 1);
     crop->y &= ~((1 << crop->vsub) - 1);
 
+#ifdef DEBUG
     av_log(ctx, AV_LOG_DEBUG,
            "n:%d t:%f x:%d y:%d x+w:%d y+h:%d\n",
            (int)crop->var_values[VAR_N], crop->var_values[VAR_T], crop->x, crop->y, crop->x+crop->w, crop->y+crop->h);
+#endif
 
     ref2->data[0] += crop->y * ref2->linesize[0];
     ref2->data[0] += crop->x * crop->max_step[0];