fix

prenc/prenc/MovieWriter.h

@@ -36,7 +36,7 @@
  * @param outFileName output file name
  * @return instance of MovieWriter, nil otherwise
  */
-- (id)initWithOutFile:(NSString *)outFileName;
+- (id)initWithOutFile:(NSString *)outFileName timescale:(CMTimeScale)ts;
 
 /**
  * Writes CMSampleBuffer with encoded data to QuickTime Movie file.

prenc/prenc/MovieWriter.m

@@ -28,6 +28,7 @@ @interface MovieWriter ()
 
 @property (strong, nonatomic) AVAssetWriter      *assetWriter;
 @property (strong, nonatomic) AVAssetWriterInput *assetInput;
+@property (assign, nonatomic) CMTimeScale timescale;
 
 @end
 
@@ -36,17 +37,19 @@ @implementation MovieWriter
 
 - (id)init
 {
-    return [self initWithOutFile:@"output.mov"];
+    return [self initWithOutFile:@"output.mov" timescale:600];
 }
 
-- (id)initWithOutFile:(NSString *)outFileName
+- (id)initWithOutFile:(NSString *)outFileName timescale:(CMTimeScale)ts
 {
     NSURL   *url = nil;
     NSError *error;
 
     if ((self = [super init]) == nil)
         return nil;
-
+
+    self.timescale = ts;
+
     url = [[NSURL alloc] initFileURLWithPath:outFileName];
     // remove if file already exists
     if (![[NSFileManager defaultManager] removeItemAtPath:[url path] error:&error])
@@ -72,6 +75,9 @@ - (id)initWithOutFile:(NSString *)outFileName
         return nil;
     }
 
+    self.assetWriter.movieTimeScale = self.timescale;
+    self.assetInput.mediaTimeScale = self.timescale;
+
     [self.assetWriter addInput:self.assetInput];
 
     if (![self.assetWriter startWriting])

prenc/prenc/prenc.m

@@ -303,7 +303,7 @@ int main(int argc, char *argv[])
 
     outFileName = argv[optind];
 
-    movieWriter = [[MovieWriter alloc] initWithOutFile:[NSString stringWithUTF8String:outFileName]];
+    movieWriter = [[MovieWriter alloc] initWithOutFile:[NSString stringWithUTF8String:outFileName] timescale:tsDen];
     if (movieWriter == nil)
         return EXIT_FAILURE;