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-rw-r--r--lib/dtas/source/av_ff_common.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/dtas/source/av_ff_common.rb b/lib/dtas/source/av_ff_common.rb
index 0fb3ace..58d9f54 100644
--- a/lib/dtas/source/av_ff_common.rb
+++ b/lib/dtas/source/av_ff_common.rb
@@ -19,6 +19,7 @@ module DTAS::Source::AvFfCommon # :nodoc:
 
   attr_reader :precision # always 32
   attr_reader :format
+  attr_reader :duration
 
   def try(infile, offset = nil, trim = nil)
     rv = source_file_dup(infile, offset, trim)