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• How to avoid ffmpeg failing to add chapters to mov file ?

  27 septembre 2022, par BabaG

  I've been trying all day to get ffmpeg to add chapters to a prores mov file. It does add the first two, but then it fails with the name of the text file and an error message :

  


  chapterstest_orig.txt: Invalid data found when processing input


  


  I see lots of online references to the format of both the ffmpeg command, as well as the text file containing the chapter metadata. Here are mine :

  


  ffmpeg -i chapterstest_orig.mov -i chapterstest_orig.txt -map_metadata 1 -codec copy chapterstest.mov


  


  i've also tried it with -map_chapters :

  


  ffmpeg -i chapterstest_orig.mov -i chapterstest_orig.txt -map_metadata 1 -map_chapters 1 -codec copy chapterstest.mov


  


  Here's a copy of my text file, containing the chapter info :

  


  ;FFMETADATA1
title=Angel's Gate Cultural Center
artist=Buzzworld

[CHAPTER]
TIMEBASE=1/1000
START=0
END=6999
title=Buzzworld 10-10-1997

[CHAPTER]
TIMEBASE=1/1000
START=7000
END=290999
title=The Road To Lisdoonvarna

[CHAPTER]
TIMEBASE=1/1000
START=291000
END=739999
title=Jack Orion

[CHAPTER]
TIMEBASE=1/1000
START=740000
END=992999
title=The Frieze Britches

[CHAPTER]
TIMEBASE=1/1000
START=993000
END=1295999
title=The Blackleg Miner

[CHAPTER]
TIMEBASE=1/1000
START=1296000
END=1559999
title=Johnny Jump Up

[CHAPTER]
TIMEBASE=1/1000
START=1560000
END=1867999
title=Tom Billy's

[CHAPTER]
TIMEBASE=1/1000
START=1868000
END=2143999
title=When Will We Be Married?

[CHAPTER]
TIMEBASE=1/1000
START=2144000
END=2500999
title=The Old Bush

[CHAPTER]
TIMEBASE=1/1000
START=2501000
END=2839000
title=Niamh's Capers


  


  If I delete everything after the second chapter, the file processes. It always fails if I add more chapters.

  


  I've also tried using things like :

  


  -map 0:v -map 0:a -map 0:s


  


  Any help is much appreciated. I'm kind of at my wits end here.

  


  Thanks.

  


• Seeking with ffmpeg options fails or causes delayed playback in Discord bot

  29 août 2022, par J Petersen

  My Discord bot allows users to play a song starting from a timestamp.

  


  The problem is that playback is delayed and audio plays faster and is jumbled if start times >= 30s are set.

  


  Results from testing different start times. Same URL, 30 second duration :

  


  





  


  


  


  


  


  



  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  Entered Start Time (s)	Playback Delay (s)	Song Playback Time (s)
  0	3	30
  30	10	22
  60	17	17
  120	31	2
  150	120	<1

  


  


  I am setting the start time using ffmpeg_options as suggested in this question.

  


  Does anyone understand why the audio playback is being delayed/jumbled ? How can I improve playback delay and allow users to start in the middle of a multi-chapter YouTube video ?

  


  Code :

  


  import discord
import youtube_dl
import asyncio


# Suppress noise about console usage from errors
youtube_dl.utils.bug_reports_message = lambda: ""


ytdl_format_options = {
    "format": "bestaudio/best",
    "outtmpl": "%(extractor)s-%(id)s-%(title)s.%(ext)s",
    "restrictfilenames": True,
    "noplaylist": False,
    "yesplaylist": True,
    "nocheckcertificate": True,
    "ignoreerrors": False,
    "logtostderr": False,
    "quiet": True,
    "no_warnings": True,
    "default_search": "auto",
    "source_address": "0.0.0.0",  # Bind to ipv4 since ipv6 addresses cause issues at certain times
}

ytdl = youtube_dl.YoutubeDL(ytdl_format_options)


class YTDLSource(discord.PCMVolumeTransformer):
    def __init__(self, source: discord.AudioSource, *, data: dict, volume: float = 0.5):
        super().__init__(source, volume)

        self.data = data

        self.title = data.get("title")
        self.url = data.get("url")

    @classmethod
    async def from_url(cls, url, *, loop=None, stream=False, timestamp = 0):
        ffmpeg_options = {
            "options": f"-vn -ss {timestamp}"}

        loop = loop or asyncio.get_event_loop()

        data = await loop.run_in_executor(None, lambda: ytdl.extract_info(url, download=not stream))
        if "entries" in data:
            # Takes the first item from a playlist
            data = data["entries"][0]

        filename = data["url"] if stream else ytdl.prepare_filename(data)
        return cls(discord.FFmpegPCMAudio(filename, **ffmpeg_options), data=data)


intents = discord.Intents.default()

bot = discord.Bot(intents=intents)

@bot.slash_command()
async def play(ctx, audio: discord.Option(), seconds: discord.Option(), timestamp: discord.Option()):
    channel = ctx.author.voice.channel
    voice = await channel.connect()
    player = await YTDLSource.from_url(audio, loop=bot.loop, stream=True, timestamp=int(timestamp))
    voice.play(player)
    await asyncio.sleep(int(seconds))
    await voice.disconnect()

token = token value
bot.run(token)


  


• Concatenate all opus audio in folder and create chapters

  7 octobre 2024, par Petrus Vermaak

  I need to join multiple (mp3 or opus) audio in a directory into a single file. I also need to preserve/create each audio as a chapter. The expected outcome is that the output contains the chapter information in the file, so one can easily skip to the desired chapter using vlc player, etc.

  


  I need to do this on Windows and have found a way to join the files, but it does not preserve the chapter information : cmd type *.opus  | FFmpeg  -i pipe: -c:a copy all.opus

  


  Can anyone please tell me how to preserve chapters on Windows ? I don't mind using a script as long as you tell me how to create and execute it, seeing that I am a total noob lol

  


  The expected outcome is that it works like an audiobook. I have already seen that both mp3 & opus can have chapters, so I want to do this for all my audiobooks that have multiple files.