better error reporting

Author: Brendonovich

crates/enc-ffmpeg/src/mux/mp4.rs

@@ -127,7 +127,7 @@ impl MP4File {
             .map(|enc| {
                 tracing::info!("MP4Encoder: Flushing audio encoder");
                 enc.flush(&mut self.output).inspect_err(|e| {
-                    error!("Failed to finish video encoder: {e:#}");
+                    error!("Failed to finish audio encoder: {e:#}");
                 })
             })
             .unwrap_or(Ok(()));

crates/export/src/mp4.rs

@@ -111,9 +111,16 @@ impl Mp4ExportSettings {
 
             info!("Encoded {encoded_frames} video frames");
 
-            encoder
+            let res = encoder
                 .finish()
-                .map_err(|e| format!("Failed to finish encoding: {}", e))?;
+                .map_err(|e| format!("Failed to finish encoding: {e}"))?;
+
+            if let Err(e) = res.video_finish {
+                return Err(format!("Video encoding failed: {e}"));
+            }
+            if let Err(e) = res.audio_finish {
+                return Err(format!("Audio encoding failed: {e}"));
+            }
 
             Ok::<_, String>(base.output_path)
         })