diff --git a/doc/APIchanges b/doc/APIchanges
index 7e3c592d75..b4fa99f2d4 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -15,6 +15,9 @@ libavutil:     2012-10-22
 
 API changes, most recent first:
 
+2014-05-xx - xxxxxxx - lavu 52.81.0 - opt.h
+  Add av_opt_set_dict2() function.
+
 2014-04-xx - xxxxxxx - lavc 55.50.3 - avcodec.h
   Deprecate CODEC_FLAG_MV0. It is replaced by the flag "mv0" in the
   "mpv_flags" private option of the mpegvideo encoders.
diff --git a/doc/outdevs.texi b/doc/outdevs.texi
index a1d89eb801..1104133c61 100644
--- a/doc/outdevs.texi
+++ b/doc/outdevs.texi
@@ -237,6 +237,10 @@ Application must provide OpenGL context and both @code{window_size_cb} and @code
 @item window_title
 Set the SDL window title, if not specified default to the filename specified for the output device.
 Ignored when @option{no_window} is set.
+@item window_size
+Set preferred window size, can be a string of the form widthxheight or a video size abbreviation.
+If not specified it defaults to the size of the input video, downscaled according to the aspect ratio.
+Mostly usable when @option{no_window} is not set.
 
 @end table
 
diff --git a/libavdevice/opengl_enc.c b/libavdevice/opengl_enc.c
index 5f9748dd6f..28a01181a0 100644
--- a/libavdevice/opengl_enc.c
+++ b/libavdevice/opengl_enc.c
@@ -178,6 +178,7 @@ typedef struct OpenGLContext {
 #endif
     FFOpenGLFunctions glprocs;
 
+    int inited;                        ///< Set to 1 when write_header was successfully called.
     uint8_t background[4];             ///< Background color
     int no_window;                     ///< 0 for create default window
     char *window_title;                ///< Title of the window
@@ -309,8 +310,7 @@ static int opengl_resize(AVFormatContext *h, int width, int height)
     OpenGLContext *opengl = h->priv_data;
     opengl->window_width = width;
     opengl->window_height = height;
-    /* max_viewport_width == 0 means write_header was not called yet. */
-    if (opengl->max_viewport_width) {
+    if (opengl->inited) {
         if (opengl->no_window &&
             (ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER, NULL , 0)) < 0) {
             av_log(opengl, AV_LOG_ERROR, "Application failed to prepare window buffer.\n");
@@ -407,7 +407,8 @@ static int av_cold opengl_sdl_create_window(AVFormatContext *h)
         av_log(opengl, AV_LOG_ERROR, "Unable to initialize SDL: %s\n", SDL_GetError());
         return AVERROR_EXTERNAL;
     }
-    if ((ret = opengl_sdl_recreate_window(opengl, opengl->width, opengl->height)) < 0)
+    if ((ret = opengl_sdl_recreate_window(opengl, opengl->window_width,
+                                          opengl->window_height)) < 0)
         return ret;
     av_log(opengl, AV_LOG_INFO, "SDL driver: '%s'.\n", SDL_VideoDriverName(buffer, sizeof(buffer)));
     message.width = opengl->surface->w;
@@ -871,8 +872,8 @@ static av_cold int opengl_prepare_vertex(AVFormatContext *s)
     int tex_w, tex_h;
 
     if (opengl->window_width > opengl->max_viewport_width || opengl->window_height > opengl->max_viewport_height) {
-        opengl->window_width = FFMAX(opengl->window_width, opengl->max_viewport_width);
-        opengl->window_height = FFMAX(opengl->window_height, opengl->max_viewport_height);
+        opengl->window_width = FFMIN(opengl->window_width, opengl->max_viewport_width);
+        opengl->window_height = FFMIN(opengl->window_height, opengl->max_viewport_height);
         av_log(opengl, AV_LOG_WARNING, "Too big viewport requested, limited to %dx%d", opengl->window_width, opengl->window_height);
     }
     glViewport(0, 0, opengl->window_width, opengl->window_height);
@@ -951,7 +952,12 @@ static int opengl_create_window(AVFormatContext *h)
         return AVERROR(ENOSYS);
 #endif
     } else {
-        if ((ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_CREATE_WINDOW_BUFFER, NULL , 0)) < 0) {
+        AVDeviceRect message;
+        message.x = message.y = 0;
+        message.width = opengl->window_width;
+        message.height = opengl->window_height;
+        if ((ret = avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_CREATE_WINDOW_BUFFER,
+                                                       &message , sizeof(message))) < 0) {
             av_log(opengl, AV_LOG_ERROR, "Application failed to create window buffer.\n");
             return ret;
         }
@@ -1067,6 +1073,10 @@ static av_cold int opengl_write_header(AVFormatContext *h)
     opengl->width = st->codec->width;
     opengl->height = st->codec->height;
     opengl->pix_fmt = st->codec->pix_fmt;
+    if (!opengl->window_width)
+        opengl->window_width = opengl->width;
+    if (!opengl->window_height)
+        opengl->window_height = opengl->height;
 
     if (!opengl->window_title && !opengl->no_window)
         opengl->window_title = av_strdup(h->filename);
@@ -1110,6 +1120,8 @@ static av_cold int opengl_write_header(AVFormatContext *h)
 
     ret = AVERROR_EXTERNAL;
     OPENGL_ERROR_CHECK(opengl);
+
+    opengl->inited = 1;
     return 0;
 
   fail:
@@ -1266,6 +1278,7 @@ static const AVOption options[] = {
     { "background",   "set background color",   OFFSET(background),   AV_OPT_TYPE_COLOR,  {.str = "black"}, CHAR_MIN, CHAR_MAX, ENC },
     { "no_window",    "disable default window", OFFSET(no_window),    AV_OPT_TYPE_INT,    {.i64 = 0}, INT_MIN, INT_MAX, ENC },
     { "window_title", "set window title",       OFFSET(window_title), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, ENC },
+    { "window_size",  "set window size",        OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, ENC },
     { NULL }
 };
 
diff --git a/libavdevice/version.h b/libavdevice/version.h
index 4267872042..163a4c63c2 100644
--- a/libavdevice/version.h
+++ b/libavdevice/version.h
@@ -29,7 +29,7 @@
 
 #define LIBAVDEVICE_VERSION_MAJOR  55
 #define LIBAVDEVICE_VERSION_MINOR  13
-#define LIBAVDEVICE_VERSION_MICRO 100
+#define LIBAVDEVICE_VERSION_MICRO 101
 
 #define LIBAVDEVICE_VERSION_INT AV_VERSION_INT(LIBAVDEVICE_VERSION_MAJOR, \
                                                LIBAVDEVICE_VERSION_MINOR, \
diff --git a/libavdevice/xv.c b/libavdevice/xv.c
index 7353310892..d1f8907d99 100644
--- a/libavdevice/xv.c
+++ b/libavdevice/xv.c
@@ -145,19 +145,18 @@ static int xv_write_header(AVFormatContext *s)
         }
     }
     if (!xv->window_id) {
-    //TODO: reident
-    xv->window = XCreateSimpleWindow(xv->display, DefaultRootWindow(xv->display),
-                                     xv->window_x, xv->window_y,
-                                     xv->window_width, xv->window_height,
-                                     0, 0, 0);
-    if (!xv->window_title) {
-        if (!(xv->window_title = av_strdup(s->filename))) {
-            ret = AVERROR(ENOMEM);
-            goto fail;
+        xv->window = XCreateSimpleWindow(xv->display, DefaultRootWindow(xv->display),
+                                         xv->window_x, xv->window_y,
+                                         xv->window_width, xv->window_height,
+                                         0, 0, 0);
+        if (!xv->window_title) {
+            if (!(xv->window_title = av_strdup(s->filename))) {
+                ret = AVERROR(ENOMEM);
+                goto fail;
+            }
         }
-    }
-    XStoreName(xv->display, xv->window, xv->window_title);
-    XMapWindow(xv->display, xv->window);
+        XStoreName(xv->display, xv->window, xv->window_title);
+        XMapWindow(xv->display, xv->window);
     } else
         xv->window = xv->window_id;
 
diff --git a/libavformat/mux.c b/libavformat/mux.c
index 6847ec342b..7b4f7c77d3 100644
--- a/libavformat/mux.c
+++ b/libavformat/mux.c
@@ -334,7 +334,7 @@ static int init_muxer(AVFormatContext *s, AVDictionary **options)
         if (of->priv_class) {
             *(const AVClass **)s->priv_data = of->priv_class;
             av_opt_set_defaults(s->priv_data);
-            if ((ret = av_opt_set_dict(s->priv_data, &tmp)) < 0)
+            if ((ret = av_opt_set_dict2(s->priv_data, &tmp, AV_OPT_SEARCH_CHILDREN)) < 0)
                 goto fail;
         }
     }
diff --git a/libavutil/opt.c b/libavutil/opt.c
index 33ebe52749..199eadbc05 100644
--- a/libavutil/opt.c
+++ b/libavutil/opt.c
@@ -1415,7 +1415,7 @@ void av_opt_free(void *obj)
             av_freep((uint8_t *)obj + o->offset);
 }
 
-int av_opt_set_dict(void *obj, AVDictionary **options)
+int av_opt_set_dict2(void *obj, AVDictionary **options, int search_flags)
 {
     AVDictionaryEntry *t = NULL;
     AVDictionary    *tmp = NULL;
@@ -1425,7 +1425,7 @@ int av_opt_set_dict(void *obj, AVDictionary **options)
         return 0;
 
     while ((t = av_dict_get(*options, "", t, AV_DICT_IGNORE_SUFFIX))) {
-        ret = av_opt_set(obj, t->key, t->value, 0);
+        ret = av_opt_set(obj, t->key, t->value, search_flags);
         if (ret == AVERROR_OPTION_NOT_FOUND)
             av_dict_set(&tmp, t->key, t->value, 0);
         else if (ret < 0) {
@@ -1439,6 +1439,11 @@ int av_opt_set_dict(void *obj, AVDictionary **options)
     return ret;
 }
 
+int av_opt_set_dict(void *obj, AVDictionary **options)
+{
+    return av_opt_set_dict2(obj, options, 0);
+}
+
 const AVOption *av_opt_find(void *obj, const char *name, const char *unit,
                             int opt_flags, int search_flags)
 {
diff --git a/libavutil/opt.h b/libavutil/opt.h
index 6a1ae4354a..1e1dd69b30 100644
--- a/libavutil/opt.h
+++ b/libavutil/opt.h
@@ -541,6 +541,24 @@ int av_opt_flag_is_set(void *obj, const char *field_name, const char *flag_name)
  */
 int av_opt_set_dict(void *obj, struct AVDictionary **options);
 
+
+/**
+ * Set all the options from a given dictionary on an object.
+ *
+ * @param obj a struct whose first element is a pointer to AVClass
+ * @param options options to process. This dictionary will be freed and replaced
+ *                by a new one containing all options not found in obj.
+ *                Of course this new dictionary needs to be freed by caller
+ *                with av_dict_free().
+ * @param search_flags A combination of AV_OPT_SEARCH_*.
+ *
+ * @return 0 on success, a negative AVERROR if some option was found in obj,
+ *         but could not be set.
+ *
+ * @see av_dict_copy()
+ */
+int av_opt_set_dict2(void *obj, struct AVDictionary **options, int search_flags);
+
 /**
  * Extract a key-value pair from the beginning of a string.
  *
diff --git a/libavutil/version.h b/libavutil/version.h
index a17cb506de..3cb5b66666 100644
--- a/libavutil/version.h
+++ b/libavutil/version.h
@@ -56,7 +56,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  52
-#define LIBAVUTIL_VERSION_MINOR  80
+#define LIBAVUTIL_VERSION_MINOR  81
 #define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \