diff --git a/src/filter_graph.rs b/src/filter_graph.rs
index f27df7d..71f6770 100644
--- a/src/filter_graph.rs
+++ b/src/filter_graph.rs
@@ -1,5 +1,5 @@
 use crate::{
-  audio_decoder::AudioDecoder, filter::Filter, frame::Frame, order::*, stream::Stream, tools,
+  audio_decoder::AudioDecoder, filter::Filter, frame::Frame, order::*, tools,
   video_decoder::VideoDecoder,
 };
 use ffmpeg_sys_next::*;
@@ -51,7 +51,6 @@ impl FilterGraph {
     &mut self,
     label: &str,
     video_decoder: &VideoDecoder,
-    video_stream: Stream,
   ) -> Result<(), String> {
     let buffer = unsafe { Filter::new_with_label(self.graph, "buffer", label)? };
 
@@ -61,7 +60,12 @@ impl FilterGraph {
     let height = ParameterValue::Int64(i64::from(video_decoder.get_height()));
     height.set("height", buffer.context as *mut c_void)?;
 
-    let time_base = ParameterValue::Rational(video_stream.get_time_base());
+    let mut tbc = video_decoder.get_time_base();
+    if tbc.num == 0 {
+      tbc.num = 1;
+      tbc.den = 25;
+    }
+    let time_base = ParameterValue::Rational(tbc);
     time_base.set("time_base", buffer.context as *mut c_void)?;
 
     let pixel_aspect = ParameterValue::Rational(video_decoder.get_aspect_ratio());
diff --git a/src/order/decoder_format.rs b/src/order/decoder_format.rs
index e6b8fbf..c8011be 100644
--- a/src/order/decoder_format.rs
+++ b/src/order/decoder_format.rs
@@ -2,7 +2,6 @@ use crate::audio_decoder::AudioDecoder;
 use crate::filter_graph::FilterGraph;
 use crate::format_context::FormatContext;
 use crate::order::input::Input;
-use crate::stream::Stream;
 use crate::subtitle_decoder::SubtitleDecoder;
 use crate::tools;
 use crate::video_decoder::VideoDecoder;
@@ -32,7 +31,6 @@ impl DecoderFormat {
         let subtitle_decoders = vec![];
         let mut video_decoders = vec![];
         let mut context = FormatContext::new(path)?;
-        context.open_input()?;
         context.set_frames_addresses(frames);
 
         let identifier = if let Some(ref identifier) = label {
@@ -43,8 +41,7 @@ impl DecoderFormat {
 
         let video_decoder =
           VideoDecoder::new_with_codec(identifier.clone(), codec, *width, *height, 0)?;
-        let video_stream = Stream::new(context.get_stream(0))?;
-        graph.add_input_from_video_decoder(&identifier, &video_decoder, video_stream)?;
+        graph.add_input_from_video_decoder(&identifier, &video_decoder)?;
         video_decoders.push(video_decoder);
 
         Ok(DecoderFormat {
@@ -72,8 +69,7 @@ impl DecoderFormat {
             AVMediaType::AVMEDIA_TYPE_VIDEO => {
               let video_decoder =
                 VideoDecoder::new(identifier.clone(), &context, stream.index as isize)?;
-              let video_stream = Stream::new(context.get_stream(stream.index as isize))?;
-              graph.add_input_from_video_decoder(&identifier, &video_decoder, video_stream)?;
+              graph.add_input_from_video_decoder(&identifier, &video_decoder)?;
               video_decoders.push(video_decoder);
             }
             AVMediaType::AVMEDIA_TYPE_AUDIO => {
diff --git a/src/video_decoder.rs b/src/video_decoder.rs
index 5f62d23..ac1d748 100644
--- a/src/video_decoder.rs
+++ b/src/video_decoder.rs
@@ -23,6 +23,8 @@ impl VideoDecoder {
     unsafe {
       let codec = avcodec_find_decoder(format.get_codec_id(stream_index));
       let mut codec_context = avcodec_alloc_context3(codec);
+      (*codec_context).time_base =
+        (**(*format.format_context).streams.offset(stream_index)).time_base;
 
       check_result!(
         avcodec_parameters_to_context(