diff --git a/src/decoder.rs b/src/decoder.rs
index f69a42c..f1407e0 100644
--- a/src/decoder.rs
+++ b/src/decoder.rs
@@ -265,7 +265,17 @@ impl FfmpegDemuxer {
 }
 
 impl FfmpegDemuxer {
-	fn pump (&mut self) -> Result <
+	fn pump (&mut self) -> Result <bool> {
+		while let Some ((stream, packet)) = self.input_ctx.packets ().next () {
+			if stream.index () == self.best_stream_idx {
+				// tracing::trace! ("demuxed packet");
+				self.decoder.send_packet (&packet)?;
+				return Ok (true);
+			}
+		}
+		
+		Ok (false)
+	}
 }
 
 use crate::net_reader::NetReader;