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fix(audio): schedule delayed track fades correctly

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This commit is contained in:
tianrking
2026-07-16 13:33:17 +08:00
parent f8d94632ea
commit 5e21f1b78a
2 changed files with 130 additions and 28 deletions
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63
tools/audio/audio_mixer.py
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@@ -213,6 +213,39 @@ class AudioMixer(BaseTool):
target = max(-40.0, min(0.0, target))
return f"[{in_label}]loudnorm=I={target}:LRA=11:TP=-1.5[{out_label}]"
def _track_filters(self, track: dict[str, Any]) -> list[str]:
"""Build per-track filters on the source timeline before scheduling it.
``afade=t=out`` defaults to ``st=0``. Applying it after ``adelay``
therefore fades the delay silence instead of the source audio, leaving
a delayed track silent by the time it starts. Fade source samples first
and add the timeline delay last so both fades follow the track itself.
"""
filters = []
volume = track.get("volume", 1.0)
delay_ms = int(track.get("start_seconds", 0) * 1000)
fade_in = track.get("fade_in_seconds", 0)
fade_out = track.get("fade_out_seconds", 0)
if volume != 1.0:
filters.append(f"volume={volume}")
if fade_in > 0:
filters.append(f"afade=t=in:d={fade_in}")
if fade_out > 0:
duration_cmd = [
"ffprobe", "-v", "error",
"-show_entries", "format=duration",
"-of", "csv=p=0",
track["path"],
]
duration = float(self.run_command(duration_cmd).stdout.strip().split("\n")[0])
fade_start = max(0.0, duration - float(fade_out))
filters.append(f"afade=t=out:st={fade_start}:d={fade_out}")
if delay_ms > 0:
filters.append(f"adelay={delay_ms}|{delay_ms}")
return filters
def execute(self, inputs: dict[str, Any]) -> ToolResult:
operation = inputs["operation"]
start = time.time()
@@ -256,20 +289,7 @@ class AudioMixer(BaseTool):
for i, track in enumerate(tracks):
input_args.extend(["-i", track["path"]])
volume = track.get("volume", 1.0)
delay_ms = int(track.get("start_seconds", 0) * 1000)
fade_in = track.get("fade_in_seconds", 0)
fade_out = track.get("fade_out_seconds", 0)
filters = []
if volume != 1.0:
filters.append(f"volume={volume}")
if delay_ms > 0:
filters.append(f"adelay={delay_ms}|{delay_ms}")
if fade_in > 0:
filters.append(f"afade=t=in:d={fade_in}")
if fade_out > 0:
filters.append(f"afade=t=out:d={fade_out}")
filters = self._track_filters(track)
if filters:
filter_chain = ",".join(filters)
@@ -500,20 +520,7 @@ class AudioMixer(BaseTool):
for i, track in enumerate(all_tracks):
input_args.extend(["-i", track["path"]])
volume = track.get("volume", 1.0)
delay_ms = int(track.get("start_seconds", 0) * 1000)
fade_in = track.get("fade_in_seconds", 0)
fade_out = track.get("fade_out_seconds", 0)
filters = []
if volume != 1.0:
filters.append(f"volume={volume}")
if delay_ms > 0:
filters.append(f"adelay={delay_ms}|{delay_ms}")
if fade_in > 0:
filters.append(f"afade=t=in:d={fade_in}")
if fade_out > 0:
filters.append(f"afade=t=out:d={fade_out}")
filters = self._track_filters(track)
if filters:
filter_chain = ",".join(filters)