diff --git a/media/libstagefright/CameraSource.cpp b/media/libstagefright/CameraSource.cpp
index 3e31d61..89cb135 100644
--- a/media/libstagefright/CameraSource.cpp
+++ b/media/libstagefright/CameraSource.cpp
@@ -93,6 +93,9 @@
        return OMX_COLOR_Format16bitRGB565;
     }
 
+    LOGE("Uknown color format (%s), please add it to "
+         "CameraSource::getColorFormat", colorFormat);
+
     CHECK_EQ(0, "Unknown color format");
 }
 
diff --git a/media/libstagefright/MPEG4Writer.cpp b/media/libstagefright/MPEG4Writer.cpp
index de4233d..f0d8943 100644
--- a/media/libstagefright/MPEG4Writer.cpp
+++ b/media/libstagefright/MPEG4Writer.cpp
@@ -1675,9 +1675,9 @@
 
     }
 
-    if (mSampleSizes.empty()) {
-        err = ERROR_MALFORMED;
-    } else if (OK != checkCodecSpecificData()) {
+    if (mSampleSizes.empty() ||                      // no samples written
+        (!mIsAudio && mNumStssTableEntries == 0) ||  // no sync frames for video
+        (OK != checkCodecSpecificData())) {          // no codec specific data
         err = ERROR_MALFORMED;
     }
     mOwner->trackProgressStatus(this, -1, err);
@@ -1794,13 +1794,13 @@
         !strcasecmp(MEDIA_MIMETYPE_VIDEO_AVC, mime)) {
         if (!mCodecSpecificData ||
             mCodecSpecificDataSize <= 0) {
-            // Missing codec specific data
+            LOGE("Missing codec specific data");
             return ERROR_MALFORMED;
         }
     } else {
         if (mCodecSpecificData ||
             mCodecSpecificDataSize > 0) {
-            // Unexepected codec specific data found
+            LOGE("Unexepected codec specific data found");
             return ERROR_MALFORMED;
         }
     }
diff --git a/media/libstagefright/OMXCodec.cpp b/media/libstagefright/OMXCodec.cpp
index 165cec9..fd23b61 100644
--- a/media/libstagefright/OMXCodec.cpp
+++ b/media/libstagefright/OMXCodec.cpp
@@ -811,8 +811,7 @@
         if (OMX_ErrorNone != mOMX->getParameter(
                 mNode, OMX_IndexParamVideoPortFormat,
                 &portFormat, sizeof(portFormat))) {
-
-            return UNKNOWN_ERROR;
+            break;
         }
         // Make sure that omx component does not overwrite
         // the incremented index (bug 2897413).
@@ -832,6 +831,8 @@
             break;
         }
     }
+
+    LOGE("color format %d is not supported", colorFormat);
     return UNKNOWN_ERROR;
 }