Function extract_subtitles_from_reference

ffsubsync/ffsubsync.py:403–446

(args: argparse.Namespace)

def extract_subtitles_from_reference(args: argparse.Namespace) -> int:
    stream = args.extract_subs_from_stream
    if not stream.startswith("0:s:"):
        stream = "0:s:{}".format(stream)
    elif not stream.startswith("0:") and stream.startswith("s:"):
        stream = "0:{}".format(stream)
    if not stream.startswith("0:s:"):
        logger.error(
            "invalid stream for subtitle extraction: %s", args.extract_subs_from_stream
        )
    ffmpeg_args = [
        ffmpeg_bin_path("ffmpeg", args.gui_mode, ffmpeg_resources_path=args.ffmpeg_path)
    ]
    ffmpeg_args.extend(
        [
            "-y",
            "-nostdin",
            "-loglevel",
            "fatal",
            "-i",
            args.reference,
            "-map",
            "{}".format(stream),
            "-f",
            "srt",
        ]
    )
    if args.srtout is None:
        ffmpeg_args.append("-")
    else:
        ffmpeg_args.append(args.srtout)
    logger.info(
        "attempting to extract subtitles to {} ...".format(
            "stdout" if args.srtout is None else args.srtout
        )
    )
    retcode = subprocess.call(ffmpeg_args)
    if retcode == 0:
        logger.info("...done")
    else:
        logger.error(
            "ffmpeg unable to extract subtitles from reference; return code %d", retcode
        )
    return retcode


def _detect_srtin_from_reference(reference: str) -> List[str]: