Propagate errors in Input::packets().

examples/dump-frames.rs

@@ -45,7 +45,7 @@ fn main() -> Result<(), ffmpeg::Error> {
                 Ok(())
             };
 
-        for (stream, packet) in ictx.packets() {
+        for (stream, packet) in ictx.packets().filter_map(Result::ok) {
             if stream.index() == video_stream_index {
                 decoder.send_packet(&packet)?;
                 receive_and_process_decoded_frames(&mut decoder)?;

examples/remux.rs

@@ -42,7 +42,7 @@ fn main() {
     octx.set_metadata(ictx.metadata().to_owned());
     octx.write_header().unwrap();
 
-    for (stream, mut packet) in ictx.packets() {
+    for (stream, mut packet) in ictx.packets().filter_map(Result::ok) {
         let ist_index = stream.index();
         let ost_index = stream_mapping[ist_index];
         if ost_index < 0 {

examples/transcode-audio.rs

@@ -225,7 +225,7 @@ fn main() {
     octx.set_metadata(ictx.metadata().to_owned());
     octx.write_header().unwrap();
 
-    for (stream, mut packet) in ictx.packets() {
+    for (stream, mut packet) in ictx.packets().filter_map(Result::ok) {
         if stream.index() == transcoder.stream {
             packet.rescale_ts(stream.time_base(), transcoder.in_time_base);
             transcoder.send_packet_to_decoder(&packet);

examples/transcode-x264.rs

@@ -238,7 +238,7 @@ fn main() {
         ost_time_bases[ost_index] = octx.stream(ost_index as _).unwrap().time_base();
     }
 
-    for (stream, mut packet) in ictx.packets() {
+    for (stream, mut packet) in ictx.packets().filter_map(Result::ok) {
         let ist_index = stream.index();
         let ost_index = stream_mapping[ist_index];
         if ost_index < 0 {

src/format/context/input.rs

@@ -159,24 +159,22 @@ impl<'a> PacketIter<'a> {
 }
 
 impl<'a> Iterator for PacketIter<'a> {
-    type Item = (Stream<'a>, Packet);
+    type Item = Result<(Stream<'a>, Packet), Error>;
 
     fn next(&mut self) -> Option<<Self as Iterator>::Item> {
         let mut packet = Packet::empty();
 
-        loop {
-            match packet.read(self.context) {
-                Ok(..) => unsafe {
-                    return Some((
-                        Stream::wrap(mem::transmute_copy(&self.context), packet.stream()),
-                        packet,
-                    ));
-                },
+        match packet.read(self.context) {
+            Ok(..) => unsafe {
+                Some(Ok((
+                    Stream::wrap(mem::transmute_copy(&self.context), packet.stream()),
+                    packet,
+                )))
+            },
 
-                Err(Error::Eof) => return None,
+            Err(Error::Eof) => None,
 
-                Err(..) => (),
-            }
+            Err(e) => Some(Err(e)),
         }
     }
 }