未生成文件时，上报失败

util/ffmpeg.py

@@ -47,7 +47,18 @@ def start_render(ffmpeg_task: FfmpegTask):
     ffmpeg_process = subprocess.run(["ffmpeg", "-progress", "-", "-loglevel", "error", *ffmpeg_args], **subprocess_args(True))
     logger.info("FINISH TASK, OUTPUT IS %s", handle_ffmpeg_output(ffmpeg_process.stdout))
     code = ffmpeg_process.returncode
-    return code == 0
+    if code != 0:
+        logger.error("FFMPEG ERROR: %s", ffmpeg_process.stderr)
+        return False
+    try:
+        out_file_stat = os.stat(ffmpeg_task.output_file)
+        if out_file_stat.st_size < 4096:
+            logger.error("FFMPEG ERROR: OUTPUT FILE IS TOO SMALL")
+            return False
+    except OSError:
+        logger.error("FFMPEG ERROR: OUTPUT FILE NOT FOUND")
+        return False
+    return True
 
 def handle_ffmpeg_output(stdout: Optional[bytes]) -> str:
     out_time = "0:0:0.0"