音频淡出

util/ffmpeg.py

@@ -154,6 +154,43 @@ def probe_video_audio(video_file, type=None):
             return False
         return True
 
+
+# 音频淡出2秒
+def fade_out_audio(file, duration, fade_out_sec = 2):
+    if type(duration) == str:
+        try:
+            duration = float(duration)
+        except Exception as e:
+            logger.error("duration is not float: %s", e)
+            return file
+    tracer = get_tracer(__name__)
+    with tracer.start_as_current_span("fade_out_audio") as span:
+        span.set_attribute("audio.file", file)
+        if duration <= fade_out_sec:
+            return file
+        else:
+            new_fn = file + "_.mp4"
+            if os.path.exists(new_fn):
+                os.remove(new_fn)
+                logger.info("delete tmp file: " + new_fn)
+            try:
+                process = subprocess.run(["ffmpeg", "-i", file, "-c:v", "copy", "-c:a", "aac", "-af", "afade=t=out:st=" + str(duration - fade_out_sec) + ":d=" + str(fade_out_sec), "-y", new_fn], **subprocess_args(True))
+                span.set_attribute("ffmpeg.args", json.dumps(process.args))
+                logger.info(" ".join(process.args))
+                if process.returncode != 0:
+                    span.set_status(Status(StatusCode.ERROR))
+                    logger.error("FFMPEG ERROR: %s", process.stderr)
+                    return file
+                else:
+                    span.set_status(Status(StatusCode.OK))
+                    return new_fn
+            except Exception as e:
+                span.set_status(Status(StatusCode.ERROR))
+                logger.error("FFMPEG ERROR: %s", e)
+                return file
+
+
+
 # Create a set of arguments which make a ``subprocess.Popen`` (and
 # variants) call work with or without Pyinstaller, ``--noconsole`` or
 # not, on Windows and Linux. Typical use::