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| """One place that knows how to run ffmpeg and how to report it failing. | |
| Both the /analyze endpoint and the Stage Read pipeline shell out to ffmpeg, and both used to lose | |
| the reason it failed: one discarded the pipes, the other caught everything and returned False. A | |
| process that dies before main() then reports only a numeric exit status - on Windows 3221225794 is | |
| 0xC0000142, STATUS_DLL_INIT_FAILED, which says nothing about audio and everything about the | |
| environment the service was started in. | |
| """ | |
| import os | |
| import shutil | |
| import subprocess | |
| class FFmpegError(RuntimeError): | |
| """ffmpeg exited non-zero. The message carries its stderr where there was any.""" | |
| def ffmpeg_exe() -> str: | |
| """Absolute path to ffmpeg. Resolving it here beats relying on the PATH the service happened to | |
| inherit — a long-lived service can outlive the shell whose PATH it was started with.""" | |
| exe = os.environ.get("STAGE_READ_FFMPEG") or shutil.which("ffmpeg") | |
| if not exe: | |
| raise FFmpegError("ffmpeg is not on PATH. Install it, or set STAGE_READ_FFMPEG to its full path.") | |
| return exe | |
| def run_ffmpeg(args, timeout=None): | |
| """Run ffmpeg with the given arguments and, if it fails, say why. | |
| Passes -nostdin and an explicit DEVNULL: a service launched in the background can be holding a | |
| stdin that is no longer connected to anything, and ffmpeg reads stdin unless told not to. | |
| """ | |
| exe = ffmpeg_exe() | |
| cmd = [exe, "-nostdin", "-y", "-v", "error", *args] | |
| r = subprocess.run(cmd, stdin=subprocess.DEVNULL, capture_output=True, timeout=timeout) | |
| if r.returncode == 0: | |
| return r | |
| err = (r.stderr or b"").decode("utf-8", "replace").strip() | |
| detail = err.splitlines()[-3:] if err else [] | |
| status = r.returncode & 0xFFFFFFFF | |
| msg = f"ffmpeg failed (exit {r.returncode}, 0x{status:08X}) [{exe}]" | |
| if detail: | |
| msg += ": " + " | ".join(detail) | |
| elif status == 0xC0000142: | |
| msg += (": the process could not start (Windows STATUS_DLL_INIT_FAILED) - it produced no " | |
| "output at all. Restart the service; if it persists, set STAGE_READ_FFMPEG to a " | |
| "known-good ffmpeg.exe.") | |
| else: | |
| msg += ": no error output." | |
| raise FFmpegError(msg) | |