add a lot of debug output

examples/ffmpeg_recorder.rs

@@ -53,7 +53,7 @@ fn video_filter(
         pixel_aspect,
         fps,
     );
-    eprintln!("{}", args);
+    eprintln!("🎥 filter args: {}", args);
     vfilter.add(&filter::find("buffer").unwrap(), "in", &args)?;
     //scale?
     vfilter.add(&filter::find("buffersink").unwrap(), "out", "")?;
@@ -65,9 +65,11 @@ fn video_filter(
 
     vfilter.output("in", 0)?
         .input("out", 0)?
-        .parse("null")?;
+        .parse("null")?; // passthrough filter for video
 
     vfilter.validate()?;
+    // human-readable filter graph
+    eprintln!("{}", vfilter.dump());
 
     Ok(vfilter)
 }
@@ -79,7 +81,7 @@ fn audio_filter(
     let mut afilter = filter::Graph::new();
     let sample_rate = if sample_rate == 0.0 { 32040.0 } else { sample_rate };
     let args = format!("sample_rate={}:sample_fmt=s16:channel_layout=stereo", sample_rate);
-    eprintln!("{}", args);
+    eprintln!("🔊 filter args: {}", args);
     afilter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
     //aresample?
     afilter.add(&filter::find("abuffersink").unwrap(), "out", "")?;
@@ -175,6 +177,12 @@ impl MyEmulator {
         self.video_filter.get("in").unwrap().source().add(&vframe).unwrap();
         self.audio_filter.get("in").unwrap().source().add(&aframe).unwrap();
         while let Ok(..) = self.video_filter.get("out").unwrap().sink().frame(&mut vframe) {
+            if self.video_filter.get("in").unwrap().source().failed_requests() > 0 {
+                println!("🎥 failed to put filter input frame");
+            }
+            if self.video_filter.get("out").unwrap().source().failed_requests() > 0 {
+                println!("🎥 failed to get filter output frame");
+            }
             self.video_encoder.encode(&vframe, &mut out).unwrap();
         }
         while let Ok(..) = self.audio_filter.get("out").unwrap().sink().frame(&mut aframe) {
@@ -292,6 +300,11 @@ impl retro::wrapper::Handler for MyEmulator {
         self.video_filter = video_filter(&self.video_encoder, &self.av_info, pixel_format).unwrap();
         true
     }
+
+
+    fn log_print(&mut self, level: retro::ffi::LogLevel, msg: &str) {
+        eprint!("🕹️ [{:?}] {}", level, msg);
+}
 }
 
 #[derive(StructOpt)]
@@ -341,7 +354,7 @@ fn main() -> Fallible<()> {
     emu.frame_properties_locked = true;
     octx.write_header().unwrap();
 
-    for _ in 0..60*60 {
+        eprintln!("🖼️ frame: {}", frame);
         emu.run();
     }