123 lines
4.2 KiB
Python
123 lines
4.2 KiB
Python
import copy
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AUDIO_FORMATS = ("m4a", "mp3", "opus", "wav", "flac")
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def get_format(format: str, quality: str) -> str:
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"""
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Returns format for download
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Args:
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format (str): format selected
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quality (str): quality selected
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Raises:
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Exception: unknown quality, unknown format
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Returns:
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dl_format: Formatted download string
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"""
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format = format or "any"
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if format.startswith("custom:"):
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return format[7:]
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if format == "thumbnail":
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# Quality is irrelevant in this case since we skip the download
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return "bestaudio/best"
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if format in AUDIO_FORMATS:
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# Audio quality needs to be set post-download, set in opts
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return f"bestaudio[ext={format}]/bestaudio/best"
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if format in ("mp4", "any"):
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if quality == "audio":
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return "bestaudio/best"
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# video {res} {vfmt} + audio {afmt} {res} {vfmt}
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vfmt, afmt = ("[ext=mp4]", "[ext=m4a]") if format == "mp4" else ("", "")
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vres = f"[height<={quality}]" if quality not in ("best", "best_ios", "worst") else ""
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vcombo = vres + vfmt
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if quality == "best_ios":
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# iOS has strict requirements for video files, requiring h264 or h265
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# video codec and aac audio codec in MP4 container. This format string
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# attempts to get the fully compatible formats first, then the h264/h265
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# video codec with any M4A audio codec (because audio is faster to
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# convert if needed), and falls back to getting the best available MP4
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# file.
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return f"bestvideo[vcodec~='^((he|a)vc|h26[45])']{vres}+bestaudio[acodec=aac]/bestvideo[vcodec~='^((he|a)vc|h26[45])']{vres}+bestaudio{afmt}/bestvideo{vcombo}+bestaudio{afmt}/best{vcombo}"
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return f"bestvideo{vcombo}+bestaudio{afmt}/best{vcombo}"
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raise Exception(f"Unkown format {format}")
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def get_opts(format: str, quality: str, ytdl_opts: dict) -> dict:
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"""
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Returns extra download options
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Mostly postprocessing options
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Args:
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format (str): format selected
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quality (str): quality of format selected (needed for some formats)
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ytdl_opts (dict): current options selected
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Returns:
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ytdl_opts: Extra options
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"""
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opts = copy.deepcopy(ytdl_opts)
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postprocessors = []
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if format in AUDIO_FORMATS:
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postprocessors.append(
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{
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"key": "FFmpegExtractAudio",
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"preferredcodec": format,
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"preferredquality": 0 if quality == "best" else quality,
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}
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)
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# Add voice mono settings for MP3
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if format == "mp3" and quality == "32_mono":
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opts["postprocessor_args"] = {
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"ffmpeg": ["-ac", "1", "-ar", "22050", "-q:a", "8"]
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}
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# Add voice mono settings for OPUS
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if format == "opus" and quality == "19_mono":
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opts["postprocessor_args"] = {
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"ffmpeg": [
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"-ac", "1", # Force mono
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"-c:a", "libopus", # Use OPUS codec
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"-b:a", "19k", # Set bitrate to 19kbps
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"-application", "voip", # Optimize for speech
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"-frame_duration", "20", # Standard frame size
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"-compression_level", "10" # Highest quality compression
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]
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}
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# Audio formats without thumbnail
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if format not in ("wav") and "writethumbnail" not in opts:
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opts["writethumbnail"] = True
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postprocessors.append(
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{
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"key": "FFmpegThumbnailsConvertor",
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"format": "jpg",
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"when": "before_dl",
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}
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)
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postprocessors.append({"key": "FFmpegMetadata"})
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postprocessors.append({"key": "EmbedThumbnail"})
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if format == "thumbnail":
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opts["skip_download"] = True
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opts["writethumbnail"] = True
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postprocessors.append(
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{"key": "FFmpegThumbnailsConvertor", "format": "jpg", "when": "before_dl"}
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)
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opts["postprocessors"] = postprocessors + (
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opts["postprocessors"] if "postprocessors" in opts else []
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)
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return opts
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