diff --git a/hmmlconv/hmmlconv.c b/hmmlconv/hmmlconv.c
index c933bff..47fb0a8 100644
--- a/hmmlconv/hmmlconv.c
+++ b/hmmlconv/hmmlconv.c
@@ -11,7 +11,6 @@ exit
 #include <fcntl.h>     // open
 #include <sys/types.h> // open, mkdir
 #include <sys/stat.h>  // open, mkdir
-#include <assert.h>
 
 typedef struct
 {
@@ -143,21 +142,70 @@ Resource *LookupResource(char *Tag, char *Line)
     return Res;
 }
 
-void ProcessAnnotation(char *Line, FILE *OutFile)
+int
+ValidateTimecode(char *Timecode)
+{
+    int HMS[3] = { 0, 0, 0 }; // 0 == Seconds; 1 == Minutes; 2 == Hours
+    int Colons = 0;
+    while(*Timecode)
+    {
+        if(!(*Timecode >= '0' && *Timecode <= '9') && *Timecode != ':') { return 1; }
+
+        if(*Timecode == ':')
+        {
+            ++Colons;
+            if(Colons > 2) { return 2; }
+            for(int i = 0; i < Colons; ++i)
+            {
+                HMS[Colons - i] = HMS[Colons - (i + 1)];
+            }
+            HMS[0] = 0;
+        }
+        else
+        {
+            HMS[0] = HMS[0] * 10 + *Timecode - '0';
+        }
+
+        ++Timecode;
+    }
+
+    if(HMS[0] > 59 || HMS[1] > 59 || Timecode[-1] == ':') { return 3; }
+
+    return 0;
+}
+
+void ProcessAnnotation(char *Line, int LineNumber, FILE *OutFile)
 {
     SkipWhitespace(&Line);
-    assert(*Line == '"');
+    if(*Line != '"') { fprintf(stderr, " l.%d: Syntax error, line must begin with a \": %.*s...\n", LineNumber, 8, Line); exit(1); }
 
     fputc('[', OutFile);
-    while(*++Line != '"')
+    char Timecode[9];
+    char *Ptr = Timecode;
+    while(*++Line != '"' && *Line != '\n')
     {
-        fputc(*Line, OutFile);
+        *Ptr++ = *Line;
     }
+    *Ptr = '\0';
+
+    switch(ValidateTimecode(Timecode))
+    {
+        case 0: break;
+        case 1: fprintf(stderr, " l.%d: Invalid timecode, not a number: %s\n", LineNumber, Timecode); exit(1);
+        case 2: fprintf(stderr, " l.%d: Invalid timecode, too many colons: %s\n", LineNumber, Timecode); exit(1);
+        case 3: fprintf(stderr, " l.%d: Invalid timecode, not 0-59: %s\n", LineNumber, Timecode); exit(1);
+    }
+
+    fputs(Timecode, OutFile);
     fputc(']', OutFile);
 
-    assert(*++Line == ':');
-    assert(*++Line == ' ');
-    assert(*++Line == '"');
+    if(*++Line != ':') { fprintf(stderr, " l.%d: Syntax error, missing : before: %.*s...\n", LineNumber, 8, Line); exit(1); }
+    if(*++Line != ' ') { fprintf(stderr, " l.%d: Syntax error, missing space before: %.*s...\n", LineNumber, 8, Line); exit(1); }
+    if(*++Line != '"') { fprintf(stderr, " l.%d: Syntax error, missing \" before: %.*s...\n", LineNumber, 8, Line); exit(1); }
+
+    char *LinePtr = Line;
+    while(*LinePtr) { ++LinePtr; }
+    if(LinePtr[-1] != '"') { fprintf(stderr, " l.%d: Syntax error, missing closing \": %.*s\n", LineNumber, LinePtr-Line, Line); exit(1); }
 
     Line = InPlaceUnescape(Line);
 
@@ -165,7 +213,7 @@ void ProcessAnnotation(char *Line, FILE *OutFile)
     if(Line[0] == '@')
     {
         char *P = strchr(Line, ' ');
-        assert(P);
+        if(!P) { fprintf(stderr, " l.%d: Invalid annotation, cannot contain only a member: %.*s...\n", LineNumber, 8, Line); exit(1); }
 
         if(P[-1] == ':')
         {
@@ -177,7 +225,6 @@ void ProcessAnnotation(char *Line, FILE *OutFile)
     }
 
     char RefBuf[256];
-    char *LinePtr;
     char *RunStart = Line;
     char *FirstSpace = NULL;
     int ConsiderQuote = 0;
@@ -192,6 +239,8 @@ void ProcessAnnotation(char *Line, FILE *OutFile)
         int TmpQuoteID;
         
         // convert Resource -> ref
+        // TODO(matt): Gather the whole Resources section, and prompt if we match more than one resource
+        // TODO(matt): (Maybe) Lookup individual words from the [see Resources] thing
         if(LinePtr[0] == ' ' && LinePtr[1] == '[' && sscanf(LinePtr+1, "[see Resources, %255[^]]]%n", RefBuf, &ScanBytes) == 1 && ScanBytes)
         {
             //printf("Find Resource [%s]\n", RefBuf);
@@ -211,7 +260,7 @@ void ProcessAnnotation(char *Line, FILE *OutFile)
             }
             else
             {
-                fprintf(stderr, "WARNING: can't find resource [%s] :(\n", RefBuf);
+                fprintf(stderr, " l.%d: WARNING: can't find resource: %s :(\n", LineNumber, RefBuf);
             }
         }
 
@@ -274,7 +323,10 @@ int ProcessFile(char *InFileName, FILE *InFile, FILE *OutFile)
     char *Contents = ReadWholeFile(InFile);
     char *Ptr;
 
-    printf("Processing [%s]...\n", InFileName);
+    if(!(getenv("HERO")))
+    {
+        printf("Processing [%s]...\n", InFileName);
+    }
 
     // Resources
     ResCount = 0;
@@ -348,7 +400,10 @@ int ProcessFile(char *InFileName, FILE *InFile, FILE *OutFile)
                 LinePtr = Separator + 1;
             }
             
-            printf("Add Res: %s\n", Resources[ResCount].Site);
+            if(!(getenv("HERO")))
+            {
+                printf("Add Res: %s\n", Resources[ResCount].Site);
+            }
 
             ++ResCount;
         }
@@ -362,7 +417,7 @@ int ProcessFile(char *InFileName, FILE *InFile, FILE *OutFile)
         STATE_MARKERS,
     } State = STATE_METADATA;
 
-    int LineNumber = 0;
+    int LineNumber = 1;
     char *LineState;
     char *LinePtr = strtok_r(Contents, "\r\n", &LineState);
 
@@ -390,7 +445,7 @@ int ProcessFile(char *InFileName, FILE *InFile, FILE *OutFile)
                 if(strncmp(LinePtr, "---", 3) == 0){
                     goto Done;
                 } else {
-                    ProcessAnnotation(LinePtr, OutFile);
+                    ProcessAnnotation(LinePtr, LineNumber, OutFile);
                 }
             } break;
         }
@@ -438,6 +493,10 @@ int main(int ArgC, char **Args)
 
     int Errors = 0;
     int AlwaysOverwrite = 0;
+    if(getenv("HERO"))
+    {
+        AlwaysOverwrite = 1;
+    }
 
     for(int i = 1; i < ArgC-1; ++i)
     {