fix(worker): render_plan 保留视频原声并尊重每clip音量 (#1474)
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Co-authored-by: xiaoxia <dev@xiaoxiajianji.com> Co-committed-by: xiaoxia <dev@xiaoxiajianji.com>
This commit was merged in pull request #1474.
This commit is contained in:
@@ -67,6 +67,16 @@ def clip_has_audio(ctx: RenderContext, clip: ResolvedClip) -> bool:
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return ctx._audio_cache[key]
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def _clip_volume(clip: ResolvedClip) -> float:
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"""读取 clip 的音量配置(0.0~1.0,>1 放大)。缺省 1.0 原声。"""
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cfg = getattr(clip, "config", None) or {}
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try:
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vol = float(cfg.get("volume", 1.0))
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except (TypeError, ValueError):
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return 1.0
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return max(0.0, vol)
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# ── 音频混音 ──────────────────────────────────────────────────────────────────
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@@ -82,12 +92,13 @@ def mix_audio(
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"""音频后处理混音.
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处理逻辑:
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1. 丢弃主图层(main/broll/overlay/corner_voice)的原始音频,避免录入源视频杂音
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2. 仅使用独立音频轨(audio role,TTS/配音)作为主音频
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3. 如果提供了 bgm_path,则额外混入 BGM(支持淡入淡出、循环、人声闪避)
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4. 如果配置了 audio_tracks,则混入多轨道音频(配音、音效等)
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5. 输出时长截断到 video_duration
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6. 如果配置了降噪,最后应用降噪
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1. 保留主图层(main/broll/overlay/corner_voice)视频素材的原声,按顺序 concat 拼接
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2. 每个 clip 按 config.volume 应用音量(volume=0 静音,=1 原声)
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3. 独立音频轨(audio role,TTS/配音)通过 amix 混入
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4. 如果提供了 bgm_path,则额外混入 BGM(支持淡入淡出、循环、人声闪避)
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5. 如果配置了 audio_tracks,则混入多轨道音频(配音、音效等)
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6. 输出时长截断到 video_duration
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7. 如果配置了降噪,最后应用降噪
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Args:
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ctx: 渲染上下文
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@@ -123,10 +134,12 @@ def mix_audio(
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if "audio" in layer_map:
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audio_clips = layer_map["audio"].clips
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# ── 丢弃源视频的原始音频(避免录入杂音),成片仅保留 TTS 配音 + BGM ──
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main_clips = []
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# ── 保留源视频原声:过滤掉无音频流的 main clip(图片/无声素材) ──
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# 注意:volume=0 的 clip 不能移除——移除会导致后续 clip 音频时间轴前移、音画不同步。
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# volume=0 通过滤镜链生成静音流,保持时间轴对齐。
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main_clips = [c for c in main_clips if clip_has_audio(ctx, c)]
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# ── 防御:过滤掉无音频流的 clip ──
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# ── 防御:过滤掉无音频流的独立音频轨 ──
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audio_clips = [c for c in audio_clips if clip_has_audio(ctx, c)]
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if not main_clips and not audio_clips:
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@@ -144,7 +157,7 @@ def mix_audio(
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# 构建音频处理命令
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output_path = ctx.work_dir / f"audio_{ctx.plan_id}.aac"
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# 源视频原始音频已被丢弃(main_clips = []),最终音频完全由独立音频轨 + BGM + 多轨配置组成。
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# 主音频为视频素材原声 concat;独立音频轨(TTS/配音)通过 amix 混入。
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# 当无 main_clips 时,将独立音频轨作为主音频走 concat 拼接;当二者均有则走 amix 混音。
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if main_clips:
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effective_main = main_clips
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@@ -266,28 +279,67 @@ def concat_main_audio(
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has_speed = abs(speed - 1.0) >= 1e-6
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if not has_speed and not has_reverse:
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# 无调速无倒放:简单命令行,-ss 裁剪更高效
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command = [
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FFMPEG_BIN,
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"-y",
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"-i",
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str(clip.local_path),
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"-vn",
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"-acodec",
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"aac",
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"-b:a",
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"128k",
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"-ar",
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"48000",
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"-ac",
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"2",
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]
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if trim_start > 0:
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command.extend(["-ss", f"{trim_start:.3f}"])
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if final_duration > 0:
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command.extend(["-t", f"{final_duration:.3f}"])
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command.append(str(output_path))
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run_ffmpeg(command)
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# 无调速无倒放:根据是否需要裁剪/音量选择最高效的路径。
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vol = _clip_volume(clip)
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need_trim = trim_start > 0 or (effective_duration > 0 and final_duration < adjusted_duration)
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need_volume = abs(vol - 1.0) >= 1e-6
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if need_trim:
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# 需要裁剪:用 atrim 滤镜在滤镜链中精确裁剪(采样点级精度,不浪费解码)。
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# 滤镜顺序:atrim → asetpts → volume(先裁剪再调音量,避免处理被丢弃的数据)。
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af_parts: list[str] = []
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if trim_start > 0 and effective_duration > 0:
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af_parts.append(f"atrim=start={trim_start:.3f}:duration={final_duration:.3f}")
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elif trim_start > 0:
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af_parts.append(f"atrim=start={trim_start:.3f}")
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elif final_duration > 0:
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af_parts.append(f"atrim=duration={final_duration:.3f}")
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af_parts.append("asetpts=PTS-STARTPTS")
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if need_volume:
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af_parts.append(f"volume={vol:.4f}")
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command = [
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FFMPEG_BIN,
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"-y",
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"-i",
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str(clip.local_path),
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"-vn",
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"-af",
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",".join(af_parts),
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"-acodec",
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"aac",
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"-b:a",
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"128k",
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"-ar",
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"48000",
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"-ac",
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"2",
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]
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# atrim 已精确控制时长,无需额外 -t
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command.append(str(output_path))
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run_ffmpeg(command)
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else:
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# 无需裁剪:直接提取,最高效。音量用单个 -af(如有)。
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command = [
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FFMPEG_BIN,
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"-y",
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"-i",
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str(clip.local_path),
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"-vn",
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"-acodec",
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"aac",
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"-b:a",
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"128k",
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"-ar",
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"48000",
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"-ac",
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"2",
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]
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if need_volume:
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command.extend(["-af", f"volume={vol:.4f}"])
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if final_duration > 0:
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command.extend(["-t", f"{final_duration:.3f}"])
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command.append(str(output_path))
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run_ffmpeg(command)
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else:
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# 有调速或倒放:用 filter_complex
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speed_engine = SpeedEngine()
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@@ -312,6 +364,11 @@ def concat_main_audio(
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if reverse_filter:
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audio_filters.append(reverse_filter)
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# 音量
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vol = _clip_volume(clip)
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if abs(vol - 1.0) >= 1e-6:
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audio_filters.append(f"volume={vol:.4f}")
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# aformat 归一化:统一输出格式为 48000Hz + stereo + fltp
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audio_filters.append("aformat=sample_rates=48000:channel_layouts=stereo:sample_fmts=fltp")
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@@ -378,6 +435,11 @@ def concat_main_audio(
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if reverse_filter:
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audio_filters.append(reverse_filter)
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# 音量(0=静音,1=原声)
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vol = _clip_volume(clip)
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if abs(vol - 1.0) >= 1e-6:
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audio_filters.append(f"volume={vol:.4f}")
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# aformat 归一化:统一采样率48000Hz + 双声道stereo + fltp采样格式
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# concat filter 要求所有输入音频参数完全一致,否则 exit=234 失败
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audio_filters.append("aformat=sample_rates=48000:channel_layouts=stereo:sample_fmts=fltp")
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