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• Attaching audio to video stream using ffmpeg

  5 novembre 2023, par lazarea

  My goal is to build a simple 10-second long video with a grey background, a simple text, and a simple mp3 audio to be played. I believe it should be a simple enough task ; yet, I am unable to get it right, as the audio is not attached to the video stream.

  


  My code is as follows :

  


  import subprocess
from pathlib import Path

folder_path = Path(__file__).parent.absolute()
assert folder_path / "i_have_a_cat.mp3"

ffmpeg_command = [
    'ffmpeg',
    '-y',  # Force override without prompting
    '-f', 'lavfi',
    '-i', 'color=c=gray:s=640x480:d=10',
    '-i', str(folder_path / 'i_have_a_cat.mp3'),
    '-vf', 'drawtext=text=\'I have a cat\':fontsize=24:fontcolor=white:x=(w-text_w)/2:y=(h-text_h)/3*2:enable=\'between(t,2,5)\'',
    '-t', '10',
    str(folder_path / 'output.mp4')
]

subprocess.run(ffmpeg_command)


  


  Checking the ffmpeg logs, I don't see anything extraordinary but I'll paste them here nevertheless because I might be overlooking something.

  


  Input #0, lavfi, from 'color=c=gray:s=640x480:d=10':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc

[mp3 @ 000001d271db1140] Estimating duration from bitrate, this may be inaccurate
Input #1, mp3, from 'c:\Users\myfolder\ffmpeg_poc\i_have_a_cat.mp3':
  Metadata:
    encoder         : Lavf58.76.100
  Duration: 00:00:00.86, start: 0.000000, bitrate: 48 kb/s
    Stream #1:0: Audio: mp3, 22050 Hz, mono, fltp, 48 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  Stream #1:0 -> #0:1 (mp3 (mp3float) -> aac (native))


  


  Output #0, mp4, to 'c:\Users\myfolder\ffmpeg_poc\output.mp4':
  Metadata:
    encoder         : Lavf58.29.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p(progressive), 640x480 [SAR 1:1 DAR 4:3], q=-1--1, 25 fps, 12800 tbn, 25 tbc     
    Metadata:
      encoder         : Lavc58.54.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 22050 Hz, mono, fltp, 69 kb/s
    Metadata:
      encoder         : Lavc58.54.100 aac
[Parsed_color_0 @ 000001d271c6b040] EOF timestamp not reliable
frame=  250 fps=0.0 q=-1.0 Lsize=      24kB time=00:00:09.88 bitrate=  19.9kbits/s speed=31.3x    
video:7kB audio:12kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 23.716467%
[libx264 @ 000001d271d058c0] frame I:1     Avg QP: 9.00  size:   104
[libx264 @ 000001d271d058c0] frame P:63    Avg QP: 9.21  size:    41
[libx264 @ 000001d271d058c0] frame B:186   Avg QP:12.67  size:    21
[libx264 @ 000001d271d058c0] consecutive B-frames:  0.8%  0.0%  0.0% 99.2%
[libx264 @ 000001d271d058c0] mb I  I16..4: 100.0%  0.0%  0.0%
[libx264 @ 000001d271d058c0] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  0.0%  0.0%  0.0%  0.0%  0.0%    skip:100.0%
[libx264 @ 000001d271d058c0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.0%  0.0%  0.0%  direct: 0.0%  skip:100.0%  L0:50.0% L1:50.0% BI: 0.0%      
[libx264 @ 000001d271d058c0] 8x8 transform intra:0.0%
[libx264 @ 000001d271d058c0] coded y,uvDC,uvAC intra: 0.7% 0.0% 0.0% inter: 0.0% 0.0% 0.0%
[libx264 @ 000001d271d058c0] i16 v,h,dc,p: 97%  0%  3%  0%
[libx264 @ 000001d271d058c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 58% 10% 17%  2%  4%  2%  2%  2%  2%
[libx264 @ 000001d271d058c0] i8c dc,h,v,p: 100%  0%  0%  0%
[libx264 @ 000001d271d058c0] Weighted P-Frames: Y:1.6% UV:0.0%
[libx264 @ 000001d271d058c0] kb/s:5.26
[aac @ 000001d271d071c0] Qavg: 24689.965


  


  Edit

  


  The output of ffprobe -i output.mp4 is as follows :

  


  ffprobe version 6.0-essentials_build-www.gyan.dev Copyright (c) 2007-2023 the FFmpeg developers
  built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth 
--enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      58.  2.100 / 58.  2.100
  libavcodec     60.  3.100 / 60.  3.100
  libavformat    60.  3.100 / 60.  3.100
  libavdevice    60.  1.100 / 60.  1.100
  libavfilter     9.  3.100 /  9.  3.100
  libswscale      7.  1.100 /  7.  1.100
  libswresample   4. 10.100 /  4. 10.100
  libpostproc    57.  1.100 / 57.  1.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:00:04.00, start: 0.000000, bitrate: 37 kb/s
  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 640x480 [SAR 1:1 DAR 4:3], 6 kb/s, 25 fps, 25 tbr, 12800 tbn 
(default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 22050 Hz, mono, fltp, 111 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]


  


• ffmpeg error in subprocess.run but works in terminal

  6 juin 2023, par 8TM

  I'm creating my own MKV videos and I found a strange bug when I'm using subprocess module from python 3.11.2 to execute FFmpeg command.

  


  My FFmpeg command is running fine in terminal (ends with success) :

  


  ffmpeg -y \
-i input_video_stream.mkv \
-i input_audio_stream_1.ac3 \
-i input_audio_stream_2.ac3 \
-i input_audio_stream_3.ac3 \
-i input_audio_stream_4.ac3 \
-f srt -i input_subtitle_stream_1.srt \
-f srt -i input_subtitle_stream_2.srt \
-map 0 -map 1 -map 2 -map 3 -map 4 -map 5 -map 6 \
-c copy \
-metadata:s:a:0 language=eng -metadata:s:a:0 title="English1" \
-metadata:s:a:1 language=eng -metadata:s:a:1 title="English2" \
-metadata:s:a:2 language=eng -metadata:s:a:2 title="English3" \
-metadata:s:a:3 language=eng -metadata:s:a:3 title="English4" \
-metadata:s:s:0 language=eng -metadata:s:s:0 title="English1" -metadata:s:s:0 mimetype=application/x-ass \
-metadata:s:s:1 language=eng -metadata:s:s:1 title="English2" -metadata:s:s:1 mimetype=application/x-ass \
-disposition:a:0 default -disposition:s:s:0 default \
output_video_with_audio_and_subtitles.mkv


  


  But when I'm running it by in the same terminal (the same session and the same ffmpeg version) by python from subprocess.run(command) :

  


  subprocess.run([
    'ffmpeg', '-y',
    '-i', 'input_video_stream.mkv',
    '-i', 'input_audio_stream_1.ac3',
    '-i', 'input_audio_stream_2.ac3',
    '-i', 'input_audio_stream_3.ac3',
    '-i', 'input_audio_stream_4.ac3',
    '-f', 'srt', '-i', 'input_subtitle_stream_1.srt',
    '-f', 'srt', '-i', 'input_subtitle_stream_2.srt',
    '-map', '0', '-map', '1', '-map', '2', '-map', '3', '-map', '4', '-map', '5', '-map', '6',
    '-c', 'copy',
    '-metadata:s:a:0', 'language=eng', '-metadata:s:a:0', 'title="English1"', 
    '-metadata:s:a:1', 'language=eng', '-metadata:s:a:1', 'title="English2"', 
    '-metadata:s:a:2', 'language=eng', '-metadata:s:a:2', 'title="English3"', 
    '-metadata:s:a:3', 'language=eng', '-metadata:s:a:3', 'title="English4"', 
    '-metadata:s:s:0', 'language=eng', '-metadata:s:s:0', 'title="English1"', 
    '-metadata:s:s:0', 'mimetype=application/x-ass',
    '-metadata:s:s:1', 'language=eng', '-metadata:s:s:1', 'title="English2"', '-metadata:s:s:1', 'mimetype=application/x-ass', 
    '-disposition:a:0 default', '-disposition:s:s:0 default', 
    'output_video_with_audio_and_subtitles.mkv'
])



  


  it fails :

  


  
ffmpeg version 5.1.2-3 Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 12 (Debian 12.2.0-14)
  configuration : —prefix=/usr —extra-version=3 —toolchain=hardened —libdir=/usr/lib/x86_64-linux-gnu —incdir=/usr/include/x86_64-linux-gnu —arch=amd64 —enable-gpl —disable-stripping —enable-gnutls —enable-ladspa —enable-libaom —enable-libass —enable-libbluray —enable-libbs2b —enable-libcaca —enable-libcdio —enable-libcodec2 —enable-libdav1d —enable-libflite —enable-libfontconfig —enable-libfreetype —enable-libfribidi —enable-libglslang —enable-libgme —enable-libgsm —enable-libjack —enable-libmp3lame —enable-libmysofa —enable-libopenjpeg —enable-libopenmpt —enable-libopus —enable-libpulse —enable-librabbitmq —enable-librist —enable-librubberband —enable-libshine —enable-libsnappy —enable-libsoxr —enable-libspeex —enable-libsrt —enable-libssh —enable-libsvtav1 —enable-libtheora —enable-libtwolame —enable-libvidstab —enable-libvorbis —enable-libvpx —enable-libwebp —enable-libx265 —enable-libxml2 —enable-libxvid —enable-libzimg —enable-libzmq —enable-libzvbi —enable-lv2 —enable-omx —enable-openal —enable-opencl —enable-opengl —enable-sdl2 —disable-sndio —enable-libjxl —enable-pocketsphinx —enable-librsvg —enable-libmfx —enable-libdc1394 —enable-libdrm —enable-libiec61883 —enable-chromaprint —enable-frei0r —enable-libx264 —enable-libplacebo —enable-librav1e —enable-shared
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
Input #0, matroska,webm, from 'input_video_stream.mkv' :
  Metadata :
    ENCODER : Lavf59.27.100
  Duration : 00:44:19.94, start : 0.000000, bitrate : 22551 kb/s
  Stream #0:0 : Video : h264 (High), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn (default)
    Metadata :
      BPS : 22549589
      NUMBER_OF_FRAMES : 63631
      NUMBER_OF_BYTES : 7480665638
      _STATISTICS_WRITING_APP : mkvmerge v56.0.0 ('Strasbourg / St. Denis') 64-bit
      _STATISTICS_WRITING_DATE_UTC : 2023-05-15 08:21:43
      _STATISTICS_TAGS : BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      DURATION : 00:44:19.942000000
[ac3 @ 0x55b374ee9e80] Estimating duration from bitrate, this may be inaccurate
Input #1, ac3, from 'input_audio_stream_1.ac3' :
  Duration : 00:44:19.89, start : 0.000000, bitrate : 448 kb/s
  Stream #1:0 : Audio : ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
[ac3 @ 0x55b37502ef80] Estimating duration from bitrate, this may be inaccurate
Input #2, ac3, from 'input_audio_stream_2.ac3' :
  Duration : 00:44:19.89, start : 0.000000, bitrate : 192 kb/s
  Stream #2:0 : Audio : ac3, 48000 Hz, stereo, fltp, 192 kb/s
[ac3 @ 0x55b374efc900] Estimating duration from bitrate, this may be inaccurate
Input #3, ac3, from 'input_audio_stream_3.ac3' :
  Duration : 00:43:19.18, start : 0.000000, bitrate : 384 kb/s
  Stream #3:0 : Audio : ac3, 48000 Hz, stereo, fltp, 384 kb/s
[ac3 @ 0x55b374fd60c0] Estimating duration from bitrate, this may be inaccurate
Input #4, ac3, from 'input_audio_stream_4.ac3' :
  Duration : 00:43:19.18, start : 0.000000, bitrate : 192 kb/s
  Stream #4:0 : Audio : ac3, 48000 Hz, stereo, fltp, 192 kb/s
Input #5, srt, from 'input_subtitle_stream_1.srt' :
  Duration : N/A, bitrate : N/A
  Stream #5:0 : Subtitle : subrip
Input #6, srt, from 'input_subtitle_stream_2.srt' :
  Duration : N/A, bitrate : N/A
  Stream #6:0 : Subtitle : subrip
[matroska @ 0x55b3751a1940] Invalid stream specifier : a:0 default.
    Last message repeated 1 times


  


  I know it's reporting something with audio ([matroska @ 0x55b3751a1940] Invalid stream specifier : a:0 default. Last message repeated 1 times) but it's probably problem with my ffmpeg command.

  


• Discord music bot doesn't play songs

  9 octobre 2023, par Gam3rsCZ

  I have made myself a discord bot that also plays music(it's only for my server so strings with messages are in Czech, but code is in English).
Bot worked a while ago but now it stopped, and I don't know where the problem is

  


  I'm getting these errors : HTTP error 403 Forbidden Server returned 403 Forbidden (access denied) and
C :\Users\Me\AppData\Local\Programs\Python\Python311\Lib\site-packages\discord\player.py:711 : RuntimeWarning : coroutine 'music_cog.play_next' was never awaited
self.after(error)
RuntimeWarning : Enable tracemalloc to get the object allocation traceback
[2023-10-09 16:23:47] [INFO ] discord.player : ffmpeg process 17496 successfully terminated with return code of 1.
INFO : ffmpeg process 17496 successfully terminated with return code of 1.

  


  My code is :

  


  import discord
from discord.ext import commands
from yt_dlp import YoutubeDL

class music_cog(commands.Cog):
    def __init__(self, bot):
        self.bot = bot

        self.is_playing = False
        self.is_paused = False
        self.current = ""

        self.music_queue = []
        self.YDL_OPTIONS = {"format": "m4a/bestaudio/best", "noplaylist": "True"}
        self.FFMPEG_OPTIONS = {"before_options": "-reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 5", "options": "-vn"}

        self.vc = None

    def search_yt(self, item):
        with YoutubeDL(self.YDL_OPTIONS) as ydl:
            try:
                info = ydl.extract_info("ytsearch:%s" % item, download=False)["entries"][0]
            except Exception:
                return False
        info = ydl.sanitize_info(info)
        url = info['url']
        title = info['title']
        return {'title': title, 'source': url}

    async def play_next(self):
        if len(self.music_queue) > 0:
            self.is_playing = True
            self.current = self.music_queue[0][0]["title"]
            m_url = self.music_queue[0][0]["source"]

            self.music_queue.pop(0)

            await self.vc.play(discord.FFmpegPCMAudio(m_url, **self.FFMPEG_OPTIONS), after=lambda e:  self.play_next())
        else:
            self.is_playing = False

    async def play_music(self, ctx):
        try:
            if len(self.music_queue) > 0:
                self.is_playing = True
                m_url = self.music_queue[0][0]["source"]

                if self.vc == None or not self.vc.is_connected():
                    self.vc =  await self.music_queue[0][1].connect()

                    if self.vc == None:
                        await ctx.send("Nepodařilo se připojit do hlasového kanálu.")
                        return
                else:
                    await self.vc.move_to(self.music_queue[0][1])

                self.current = self.music_queue[0][0]["title"]
                self.music_queue.pop(0)

                self.vc.play(discord.FFmpegPCMAudio(m_url, **self.FFMPEG_OPTIONS), after=lambda e: self.play_next())
            else:
                self.is_playing = False

        except:
            print("Something went wrong")
            await ctx.send(content="Něco se pokazilo")

    @commands.command(name="play", help="Plays selected song from YouTube")
    async def play(self, ctx, *args):
        query = " ".join(args)

        voice_channel = ctx.author.voice.channel
        if voice_channel is None:
            await ctx.send("Připojte se do hlasového kanálu!")
        elif self.is_paused:
            self.vc.resume()
        else:
            song = self.search_yt(query)
            if type(song) == type(True):
                await ctx.send("Písničku se nepodařilo stáhnout. Špatný formát, možná jste se pokusili zadat playlist nebo livestream.")
            else:
                await ctx.send("Písnička přidána do řady.")
                self.music_queue.append([song, voice_channel])

                if self.is_playing == False:
                    await self.play_music(ctx)
                    self.is_playing = True

    @commands.command(name="pause", aliases=["p"], help="Pauses the BOT")
    async def pause(self, ctx, *args):
        if self.is_playing:
            self.is_playing = False
            self.is_paused = True
            self.vc.pause()
            await ctx.send(content="Písnička byla pozastavena.")
            
        elif self.is_paused:
            self.is_playing = True
            self.is_paused = False
            self.vc.resume()
            await ctx.send(content="Písnička byla obnovena.")

    @commands.command(name="resume", aliases=["r"], help="Resumes playing")
    async def resume(self, ctx, *args):
        if self.is_paused:
            self.is_paused = False
            self.is_playing = True
            self.vc.resume()
            await ctx.send(content="Písnička byla obnovena.")

    @commands.command(name="skip", aliases=["s"], help="Skips current song")
    async def skip(self, ctx, *args):
        if self.vc != None and self.vc:
            self.vc.stop()
        await self.play_next()
        await ctx.send(content="Písnička byla přeskočena.")

    @commands.command(name="queue", aliases=["q"], help="Displays song queue")
    async def queue(self, ctx, songs=5):
        retval = ""

        for i in range(0, len(self.music_queue)):
            if i > songs: break
            retval += "    " + self.music_queue[i][0]["title"] + "\n"

        if retval != "":
            retval += "```"
            await ctx.send(content=("```Aktuální fronta:\n" + retval))
        else:
            await ctx.send("Řada je prázdná.")

    @commands.command(name="clear", help="Clears the queue")
    async def clear(self, ctx):
        if self.vc != None and self.is_playing:
            self.vc.stop()
        self.music_queue = []
        await ctx.send("Řada byla vymazána.")

    @commands.command(name="leave", aliases=["dc", "disconnect"], help="Disconnects the BOT")
    async def leave(self, ctx):
        self.is_playing = False
        self.is_paused = False

        if self.vc != None:
            return await self.vc.disconnect(), await ctx.send(content="BOT byl odpojen.")

        else:
            return await ctx.send("BOT není nikde připojen.")
   
    @commands.command(name="current", help="Displays the current song")
    async def current(self, ctx):
        current = self.current
        retval = f"```Právě hraje:\n    {current}```"
        if current != "":
            await ctx.send(retval)
        else:
            await ctx.send("Aktuálně nic nehraje.")


  


  I already tried everything I can think of(which isn't a lot because I suck at programming), and also tried searching for some solution on the internet, but nothing worked.