diff --git a/src/debug.cpp b/src/debug.cpp
index 079a554a0..d440efc7a 100644
--- a/src/debug.cpp
+++ b/src/debug.cpp
@@ -140,12 +140,15 @@ void log_msg(int level, const char *format, ...) {
 
 }
 
-void log_msg_once(int level, uint32_t id, const char *msg) {
+void log_msg_once(int level, uint32_t id, const char *msg, ...) {
         if (Logger::oneshot_messages.count(id) > 0 || log_level < level) {
                 return;
         }
         Logger::oneshot_messages.insert(id);
-        Logger(level).Get() << msg;
+        va_list aq;
+        va_start(aq, msg);
+        log_vprintf(level, msg, aq);
+        va_end(aq);
 }
 
 /**
diff --git a/src/debug.h b/src/debug.h
index 60bf3774d..e944f9db9 100644
--- a/src/debug.h
+++ b/src/debug.h
@@ -96,7 +96,7 @@ void debug_file_dump(const char *key, void (*serialize)(const void *data, FILE *
 #define debug_msg(...) log_msg(LOG_LEVEL_DEBUG, __VA_ARGS__)
 void log_msg(int log_level, const char *format, ...) ATTRIBUTE(format (printf, 2, 3));
 int log_vprintf(int level, const char *format, va_list ap);
-void log_msg_once(int log_level, uint32_t id, const char *msg);
+void log_msg_once(int log_level, uint32_t id, const char *msg, ...) ATTRIBUTE(format (printf, 3, 4));;
 void log_perror(int log_level, const char *msg);
 
 bool parse_log_cfg(const char *conf_str,
@@ -303,7 +303,7 @@ private:
         int level;
         std::ostringstream oss;
 
-        friend void log_msg_once(int level, uint32_t id, const char *msg);
+        friend void log_msg_once(int level, uint32_t id, const char *msg, ...);
         static thread_local std::set<uint32_t> oneshot_messages;
 };
 
diff --git a/src/video_display/gl.cpp b/src/video_display/gl.cpp
index 3fcdf9bca..b741ad822 100644
--- a/src/video_display/gl.cpp
+++ b/src/video_display/gl.cpp
@@ -958,7 +958,7 @@ static void gl_render(struct state_gl *s, char *data)
                                         (unsigned char *) data, vc_get_linesize(s->current_display_desc.width, s->current_display_desc.color_spec),
                                         (unsigned char *) data, vc_get_linesize(s->current_display_desc.width, s->current_display_desc.color_spec),
                                         s->current_display_desc.height)) {
-                         log_msg_once(LOG_LEVEL_ERROR, GL_DEINTERLACE_IMPOSSIBLE_MSG_ID, MOD_NAME "Cannot deinterlace, unsupported pixel format!\n");
+                         log_msg_once(LOG_LEVEL_ERROR, GL_DEINTERLACE_IMPOSSIBLE_MSG_ID, MOD_NAME "Cannot deinterlace, unsupported pixel format '%s'!\n", get_codec_name(s->current_display_desc.color_spec));
                 }
         }
 
diff --git a/src/video_display/sdl2.cpp b/src/video_display/sdl2.cpp
index be13def77..be69b2524 100644
--- a/src/video_display/sdl2.cpp
+++ b/src/video_display/sdl2.cpp
@@ -182,7 +182,7 @@ static void display_frame(struct state_sdl2 *s, struct video_frame *frame)
                 int pitch;
                 SDL_LockTexture(s->texture, NULL, (void **) &pixels, &pitch);
                 if (!vc_deinterlace_ex(frame->color_spec, (unsigned char *) frame->tiles[0].data, vc_get_linesize(frame->tiles[0].width, frame->color_spec), pixels, pitch, frame->tiles[0].height)) {
-                         log_msg_once(LOG_LEVEL_ERROR, SDL2_DEINTERLACE_IMPOSSIBLE_MSG_ID, MOD_NAME "Cannot deinterlace, unsupported pixel format!\n");
+                         log_msg_once(LOG_LEVEL_ERROR, SDL2_DEINTERLACE_IMPOSSIBLE_MSG_ID, MOD_NAME "Cannot deinterlace, unsupported pixel format '%s'!\n", get_codec_name(frame->color_spec));
                 }
                 SDL_UnlockTexture(s->texture);
         }
diff --git a/src/vo_postprocess/deinterlace.c b/src/vo_postprocess/deinterlace.c
index f43eb2173..e11166105 100644
--- a/src/vo_postprocess/deinterlace.c
+++ b/src/vo_postprocess/deinterlace.c
@@ -51,6 +51,8 @@
 #include "video_display.h"
 #include "vo_postprocess.h"
 
+#define MOD_NAME "[deinterlace] "
+
 struct state_deinterlace {
         struct video_frame *out; ///< for postprocess only
 };
@@ -120,9 +122,11 @@ static bool deinterlace_postprocess(void *state, struct video_frame *in, struct
         assert (in->tiles[0].data_len <= vc_get_linesize(in->tiles[0].width, in->color_spec) * in->tiles[0].height);
         assert (out->tiles[0].data_len <= vc_get_linesize(in->tiles[0].width, in->color_spec) * in->tiles[0].height);
 
-        vc_deinterlace_ex(in->color_spec, (unsigned char *) in->tiles[0].data, vc_get_linesize(in->tiles[0].width, in->color_spec),
+        if (!vc_deinterlace_ex(in->color_spec, (unsigned char *) in->tiles[0].data, vc_get_linesize(in->tiles[0].width, in->color_spec),
                                 (unsigned char *) out->tiles[0].data, vc_get_linesize(out->tiles[0].width, in->color_spec),
-                                in->tiles[0].height);
+                                in->tiles[0].height)) {
+                log_msg(LOG_LEVEL_ERROR, MOD_NAME "Cannot deinterlace, unsupported pixel format '%s'!\n", get_codec_name(in->color_spec));
+        }
         memcpy(out->tiles[0].data, in->tiles[0].data, in->tiles[0].data_len);
 
         return true;
diff --git a/src/vo_postprocess/double-framerate.cpp b/src/vo_postprocess/double-framerate.cpp
index 65a17e0e8..2611076ea 100644
--- a/src/vo_postprocess/double-framerate.cpp
+++ b/src/vo_postprocess/double-framerate.cpp
@@ -189,7 +189,7 @@ static bool df_postprocess(void *state, struct video_frame *in, struct video_fra
                                 (unsigned char *) out->tiles[0].data, vc_get_linesize(out->tiles[0].width, out->color_spec),
                                 (unsigned char *) out->tiles[0].data, vc_get_linesize(out->tiles[0].width, out->color_spec),
                                 out->tiles[0].height)) {
-                         log_msg_once(LOG_LEVEL_ERROR, DFR_DEINTERLACE_IMPOSSIBLE_MSG_ID, MOD_NAME "Cannot deinterlace, unsupported pixel format!\n");
+                         log_msg_once(LOG_LEVEL_ERROR, DFR_DEINTERLACE_IMPOSSIBLE_MSG_ID, MOD_NAME "Cannot deinterlace, unsupported pixel format '%s'!\n", get_codec_name(in->color_spec));
                 }
         }