diff --git a/ch7/input_uvc_patch b/ch7/input_uvc_patch
new file mode 100644
index 0000000..2905456
--- /dev/null
+++ b/ch7/input_uvc_patch
@@ -0,0 +1,52 @@
+--- plugins/input_uvc/input_uvc.c       (revision 182)
++++ plugins/input_uvc/input_uvc.c       (working copy)
+@@ -407,7 +407,7 @@
+             pglobal->in[pcontext->id].size = compress_yuyv_to_jpeg(pcontext->videoIn, pglobal->in[pcontext->id].buf, pcontext->videoIn->framesizeIn, gquality);
+         } else {
+             DBG("copying frame from input: %d\n", (int)pcontext->id);
+-            pglobal->in[pcontext->id].size = memcpy_picture(pglobal->in[pcontext->id].buf, pcontext->videoIn->tmpbuffer, pcontext->videoIn->buf.bytesused);
++            pglobal->in[pcontext->id].size = memcpy_picture(pglobal->in[pcontext->id].buf, pcontext->videoIn->tmpbuffer, pcontext->videoIn->tmpbytesused);
+         }
+ 
+ #if 0
+@@ -419,7 +419,7 @@
+ #endif
+ 
+         /* copy this frame's timestamp to user space */
+-        pglobal->in[pcontext->id].timestamp = pcontext->videoIn->buf.timestamp;
++        pglobal->in[pcontext->id].timestamp = pcontext->videoIn->tmptimestamp;
+ 
+         /* signal fresh_frame */
+         pthread_cond_broadcast(&pglobal->in[pcontext->id].db_update);
+===================================================================
+--- plugins/input_uvc/v4l2uvc.c (revision 182)
++++ plugins/input_uvc/v4l2uvc.c (working copy)
+@@ -450,6 +450,8 @@
+         */
+ 
+         memcpy(vd->tmpbuffer, vd->mem[vd->buf.index], vd->buf.bytesused);
++        vd->tmpbytesused = vd->buf.bytesused;
++        vd->tmptimestamp = vd->buf.timestamp;
+ 
+         if(debug)
+             fprintf(stderr, "bytes in used %d \n", vd->buf.bytesused);
+===================================================================
+--- plugins/input_uvc/v4l2uvc.h (revision 182)
++++ plugins/input_uvc/v4l2uvc.h (working copy)
+@@ -28,6 +28,7 @@
+ 
+ 
+ #include <stdio.h>
++#include <stdint.h>
+ #include <string.h>
+ #include <fcntl.h>
+ #include <unistd.h>
+@@ -105,6 +106,8 @@
+     int framecount;
+     int recordstart;
+     int recordtime;
++    uint32_t tmpbytesused;
++    struct timeval tmptimestamp;
+ };
+ 
+ /* context of each camera thread */