Fix output APNG not working with ffmpeg.

comfy_extras/nodes_images.py

@@ -152,10 +152,10 @@ class SaveAnimatedPNG:
         if not args.disable_metadata:
             metadata = PngInfo()
             if prompt is not None:
-                metadata.add(b"tEXt", "prompt".encode("latin-1", "strict") + b"\0" + json.dumps(prompt).encode("latin-1", "strict"), after_idat=True)
+                metadata.add(b"comf", "prompt".encode("latin-1", "strict") + b"\0" + json.dumps(prompt).encode("latin-1", "strict"), after_idat=True)
             if extra_pnginfo is not None:
                 for x in extra_pnginfo:
-                    metadata.add(b"tEXt", x.encode("latin-1", "strict") + b"\0" + json.dumps(extra_pnginfo[x]).encode("latin-1", "strict"), after_idat=True)
+                    metadata.add(b"comf", x.encode("latin-1", "strict") + b"\0" + json.dumps(extra_pnginfo[x]).encode("latin-1", "strict"), after_idat=True)
 
         file = f"{filename}_{counter:05}_.png"
         pil_images[0].save(os.path.join(full_output_folder, file), pnginfo=metadata, compress_level=compress_level, save_all=True, duration=int(1000.0/fps), append_images=pil_images[1:])

web/scripts/pnginfo.js

@@ -24,7 +24,7 @@ export function getPngMetadata(file) {
 				const length = dataView.getUint32(offset);
 				// Get the chunk type
 				const type = String.fromCharCode(...pngData.slice(offset + 4, offset + 8));
-				if (type === "tEXt") {
+				if (type === "tEXt" || type == "comf") {
 					// Get the keyword
 					let keyword_end = offset + 8;
 					while (pngData[keyword_end] !== 0) {