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• Pycord Music Bot : AttributeError : 'FFmpegAudio' object has no attribute '_process'

  5 juin 2022, par Steven Mao

  I've made a discord Cog that should be able to queue up and play music, but I'm getting an error from FFmpeg when I actually try to play the URL. I have found an identical question on StackOverflow, but this user's problem was a random typo. The inputs should all be correct, so I am not sure if the problem is my code or my package.

  


  What have I done wrong ?

  


  class MusicClass(commands.Cog):
    #universal attributes
    YDL_OPTIONS = {'format': 'bestaudio', 'noplaylist': 'True'}
    FFMPEG_OPTIONS = {'before_options': '-reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 5', 'options': '-vn'}

    def __init__(self, bot):
        self.bot = bot
        self.is_playing = False
        self.music_queue = [[],''] #[[music1, music2, music3...], channel_obj]
        self.vc = ''

    @commands.command()
    async def join(self, ctx):
        if not ctx.message.author.voice:
            await ctx.send("{} is not connected to a voice channel".format(ctx.message.author.name))
            return
        else:
            channel = ctx.message.author.voice.channel
        await channel.connect()

    @commands.command()
    async def leave(self, ctx):
        voice_client = ctx.message.guild.voice_client
        if voice_client.is_connected():
            await voice_client.disconnect()
        else:
            await ctx.send("The bot is not connected to a voice channel.")
    
    #rtype: list[dict{str:}]
    #params: search string/web URL, top number of results to show
    #returns list of top 5 queries and their information
    def search_yt(self, search_query, num_results = 3):
        with YoutubeDL(self.YDL_OPTIONS) as ydl:
            try:
                top_results = ydl.extract_info(f"ytsearch{num_results}:{search_query}", download=False)['entries'][0:{num_results}]
                for i in range(len(top_results)):
                    top_results[i] = {
                        'title': top_results[i]['title'],
                        'source': top_results[i]['formats'][0]['url'],
                        'channel': top_results[i]['channel'],
                        'duration': top_results[i]['duration'],
                        'url': top_results[i]['webpage_url']
                    }
            except:
                print(f'SEARCH_YT ERROR\t search="{search_query}"')
                return False
            return top_results
    
    #rtype: None
    #looks at queue, decides whether to play the next song in queue or stop
    def play_next(self):
        print('called play_next')
        if len(self.music_queue) > 0:
            self.is_playing = True
            #assigns url AND removes from queue
            music_url = self.music_queue[0][0]['source']
            self.music_queue[0].pop(0)
            self.vc.play(discord.FFmpegAudio(music_url, **self.FFMPEG_OPTIONS), after = lambda e: self.play_next())
        else:
            self.is_playing = False

    #rtype: None
    #similar to play_next but optimized for first-time playing
    #checks if a song in queue + checks if bot's connected, then begins to play
    async def play_now(self):
        print('called play_now, queue:', self.music_queue[0])
        if len(self.music_queue) > 0:
            self.is_playing = True
            music_url = self.music_queue[0][0]['source']
            if self.vc == '' or not self.vc.is_connected():
                self.vc = await self.music_queue[1].connect()
            else:
                print('moving to new channel')
                self.vc = await self.bot.move_to(self.music_queue[1])
            self.music_queue[0].pop(0)

            #######################################################################################################
            print('ERROR HAPPENS RIGHT HERE')
            self.vc.play(discord.FFmpegAudio(music_url, **self.FFMPEG_OPTIONS), after = lambda e: self.play_next())
            #######################################################################################################
            
        else:
            self.is_playing = False

    @commands.command()
    #dynamically checks for URL link or search query, then attempts to play
    async def p(self, ctx, *args):
        voice_channel = ctx.author.voice.channel

        if voice_channel == None: #not in a VC
            await ctx.send('You have to be in a voice channel first')
            return
        else: #set channel, search and play music
            if self.music_queue[1] != voice_channel:
                self.music_queue[1] = voice_channel
            if args[0].startswith('https://www.youtube.com/watch'): #search URL
                #search web_url directly and send object to music queue
                with YoutubeDL(self.YDL_OPTIONS) as ydl:
                    try:
                        print('attempting to extract URL:', args[0])
                        music_obj = ydl.extract_info(args[0], download=False)
                        music_obj = {
                        'title': music_obj['title'],
                        'source': music_obj['formats'][0]['url'],
                        'channel': music_obj['channel'],
                        'duration': music_obj['duration'],
                        'url': music_obj['webpage_url']
                        }
                        print('music object:', music_obj)
                        print('appending URL song queue')
                        self.music_queue[0].append(music_obj)
                    except:
                        print('URL search failed. URL =', args[0])
            else: #search query, display search results, ask for which one, then add to queue
                num_results = args[len(args)-1] if args[len(args)-1].isdigit() else 3
                song_list = self.search_yt(' '.join(args), num_results)
            
            if not self.is_playing:
                await self.play_now()


  


  Now my error message...

  


  Exception ignored in: <function at="at" 0x7ff4b0a5b5e0="0x7ff4b0a5b5e0">&#xA;Traceback (most recent call last):&#xA;  File "/home/stevenmao/.local/lib/python3.8/site-packages/discord/player.py", line 127, in __del__&#xA;    self.cleanup()&#xA;  File "/home/stevenmao/.local/lib/python3.8/site-packages/discord/player.py", line 247, in cleanup&#xA;    self._kill_process()&#xA;  File "/home/stevenmao/.local/lib/python3.8/site-packages/discord/player.py", line 198, in _kill_process&#xA;    proc = self._process&#xA;AttributeError: &#x27;FFmpegAudio&#x27; object has no attribute &#x27;_process&#x27;&#xA;</function>

  


• FFMPEG creating video which have blinking opacity overlay

  13 juillet 2020, par Nikhil Solanki

  I am creating video which has an overlay of black color which is continuously changing opacity from 0.0 to 1.0(which means blinking). So, I am setting color as input and set it with blend=all_mode='overlay':all_opacity=0.5 full command :

  


  ffmpeg -i combine2.mp4 -loop 1 -i image1.png -i song.mp3 -f lavfi -i "color=black:s=540x960" -t 20 -filter_complex "[0]split=2[color][alpha]; [color]crop=iw/2:ih:0:0[color]; 
[alpha]crop=iw/2:ih:iw/2:ih[alpha]; [color][alpha]alphamerge[v1];
[1]scale=540:960, setsar=1[v2];
[3]scale=540:960, format=yuv420p, loop=-1:size=2048, fade=t=out:st=1:d=1[b];
[v2][b]blend=all_mode='overlay':all_opacity=0.5[out];
[2]showfreqs=s=540x50:mode=line:ascale=log:colors=red:win_size=540[v3];
[out][v3] overlay=main_w-overlay_w:main_h-overlay_h-10, trim=0:20[v4];
[v4][v1] overlay=1" output_video2.mp4 -y


  


  Using this command I am trying looping opacity but, its not work. Also fade=t=out is useless here ! So, what to do for blinking the layer black with opacity ?

  


• Correctly Allocate And Fill Frame In FFmpeg

  14 avril 2022, par Michel Feinstein

  I am filling a Frame with a BGR image for encoding, and I am getting a memory leak. I think I got to the source of the problem but it appears to be a library issue instead. Since FFmpeg is such a mature library, I think I am misusing it and I would like to be instructed on how to do it correctly.

  



  I am allocating a Frame using :

  



  AVFrame *bgrFrame = av_frame_alloc();


  



  And later I allocate the image in the Frame using :

  



  av_image_alloc(bgrFrame->data, bgrFrame->linesize, bgrFrame->width, bgrFrame->height, AV_PIX_FMT_BGR24, 32);


  



  Then I fill the image allocated using :

  



  av_image_fill_pointers(bgrFrame->data, AV_PIX_FMT_BGR24, bgrFrame->height, originalBGRImage.data, bgrFrame->linesize);


  



  Where originalBGRImage is an OpenCV Mat.

  



  And this has a memory leak, apparently, av_image_alloc() allocates memory, and av_image_fill_pointers() also allocates memory, on the same pointers (I can see bgrFrame->data[0] changing between calls).

  



  If I call

  



  av_freep(&bgrFrame->data[0]);


  



  After av_image_alloc(), it's fine, but if I call it after av_image_fill_pointers(), the program crashes, even though bgrFrame->data[0] is not NULL, which I find very curious.

  



  Looking FFmpeg's av_image_alloc() source code, I see it calls av_image_fill_pointers() twice inside it, once allocating a buffer buff....and later in av_image_fill_pointers() source code, data[0] is substituted by the image pointer, which is (I think) the source of the memory leak, since data[0] was holding buf from the previous av_image_alloc() call.

  



  So this brings the final question : What's the correct way of filling a frame with an image ?.