diff options
Diffstat (limited to 'app/converter/audio.py')
| -rw-r--r-- | app/converter/audio.py | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/app/converter/audio.py b/app/converter/audio.py index 9df7aff..9536788 100644 --- a/app/converter/audio.py +++ b/app/converter/audio.py @@ -6,6 +6,7 @@ threads them through, so there is no module-global path to mutate. """ import logging +import math import re import shutil import subprocess @@ -29,7 +30,12 @@ def atempo_filters(speed: float) -> str: ``atempo`` accepts 0.5..2.0 per filter; values outside that range are handled by chaining multiple filters. Returns "" when ``speed`` is 1.0. + Non-finite values (``inf``, ``nan``) are rejected: they pass a bare + ``> 0`` check and would either loop forever (``inf / 2.0`` stays + ``inf``) or produce an invalid tempo expression. """ + if not math.isfinite(speed): + raise ValueError(f"Speed must be a finite number, got {speed}") if speed <= 0: raise ValueError(f"Speed must be a positive number, got {speed}") if abs(speed - 1.0) < SPEED_EPSILON: @@ -252,7 +258,10 @@ def build_concat_command(concat_list: Path, output_path: Path, output_format: st raise ValueError("speed_path is required when speed is not 1.0") return [ "ffmpeg", "-y", *inputs, "-filter_complex", - f"[0:a]split=2[base][spd];[spd]{filters}[spdout]", + # asplit (not split): split is a video filter and rejects + # audio streams, which would fail every speed-adjusted + # assembly after synthesis had already completed. + f"[0:a]asplit=2[base][spd];[spd]{filters}[spdout]", "-map", "[base]", *encode, *tags, *cover_block, *container, str(output_path), "-map", "[spdout]", *encode, *tags, *cover_block, *container, str(speed_path), ] @@ -290,7 +299,7 @@ def build_m4b_chapters_command(concat_list: Path, metadata_file: Path, output_pa if speed_path is not None: return [ "ffmpeg", "-y", *inputs, "-filter_complex", - f"[0:a]split=2[base][spd];[spd]{atempo_filters(speed)}[spdout]", + f"[0:a]asplit=2[base][spd];[spd]{atempo_filters(speed)}[spdout]", "-map", "[base]", *cover_block, "-map_metadata", "1", "-map_chapters", "1", *encode, *tags, *container, str(output_path), "-map", "[spdout]", *cover_block, "-map_metadata", "2", "-map_chapters", "2", |