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• is there a way to change dynamic the water mark text color when using ffmpeg depending on the background color when recording a vieo file ?

  11 juillet 2023, par Shelly Ron

  This command in the command prompt window is working fine and recording the entire screen :

  


  ffmpeg -f gdigrab -framerate 24 -i desktop -preset ultrafast -pix_fmt yuv420p out.mp4


  


  this command prompt add a water mark text in the middle of the screen in white color :

  


  ffmpeg -f gdigrab -framerate 24 -i desktop -vf "drawtext=fontfile=path/to/arial.ttf:text='All rights reserved to ...':fontsize=24:fontcolor=white:x=(w-text_w)/2:y=(h-text_h)/2" -preset ultrafast -pix_fmt yuv420p out.mp4


  


  the problem is that the water mark text is in white and i can see it only when the background window color is black for example when i bring to the front the ffmpeg console window :

  


  

  


  but when it's recording some window with white background, because the text is white it can't be seen.

  


  I want to update the command prompt of the ffmpeg to make somehow dynamic so if the background window is black show the water mark text in white and then if I'm bringing up a window with background white change the water mark text automatic to black.

  


  this is the command i tried for the dynamic effect but it didn't work i got errors and then i tried so many versions of the command line, but nothing helped or worked.

  


  ffmpeg -f gdigrab -framerate 24 -i desktop -filter_complex "[0:v]drawtext=text='Watermark Text':x=(w-text_w)/2:y=(h-text_h)/2:fontfile=arial.ttf:fontsize=24,format=rgba [txt];[txt]split=2 [bw][wc];[bw]lut=r=val*2 [b];[wc]lut=r=val*0.5+0.5:g=val*0.5+0.5:b=val*0.5+0.5 [wc];[wc][b]alphamerge [wm];[wm][0:v]overlay=10:10[outv]" -c:v libx264 -preset ultrafast -map "[outv]" out.mp4


  


  and also tried this

  


  ffmpeg -f gdigrab -framerate 24 -i desktop -filter_complex "[0:v]drawtext=text='Watermark Text':x=(w-text_w)/2:y=(h-text_h)/2:fontfile=Arial.ttf:fontsize=24,format=rgba [txt];[txt]split=2 [bw][wm];[bw][1:v]split=3 [b][g][r];[b]geq=r=0:g=0.5:b=0 [b];[g]geq=r=0:g=0:b=0.5 [g];[r]geq=r=0.5:g=0:b=0 [r];[wm][b][g][r]merge=3,format=rgba [watermark];[0:v][watermark]overlay=x=(W-w)/2:y=(H-h)/2" -map "[watermark]" -map 0:a? -c:v libx264 -c:a copy -preset ultrafast out.mp4


  


• JavaFXFrameConverter consuming insane amounts of memory

  17 juillet 2023, par iexav

  The JavaFXFrameConverter (from the wrapper of the ffmpeg C library in java) convert() method is consuming an outrageous amount of memory. To elaborate a bit more, it does not happen usually. If I just make an instance of the class in my main method, grab a frame via FFMpegFrameGrabber and give it to the convert() method the memory usage is pretty much none. However, when I attempt to do pretty much the exact same in a class I made using an ExecutorService my memory usage jumps up to 8 gigabytes when convert is called. The converter and executor service are declared as member variables of my class. Namely :

  


      final JavaFXFrameConverter converter = new JavaFXFrameConverter();
    private  ExecutorService           videoExecutor;


  


  (the videoExecutor is instantiated in the constructor of the class :

  


  videoExecutor=Executors.newSingleThreadExecutor();


  


  Now, the method I am using for processing of the video frames is this :

  


      private void processVideo(){
        videoExecutor.submit(() -> {
            processingVideo.set(true);
            try{

                while(processingVideo.get() && (videoQueue.peek())!=null){

                    final Frame cloneFrame = videoQueue.poll();
                    final Image image = converter.convert(cloneFrame);
                    final long timeStampDeltaMicros = cloneFrame.timestamp - timer.elapsedMicros();
                    if (timeStampDeltaMicros > 0) {
                        final long delayMillis = timeStampDeltaMicros / 1000L;
                        try {
                            Thread.sleep(delayMillis);
                        } catch (InterruptedException e) {
                            Thread.currentThread().interrupt();
                        }
                    }

                    cloneFrame.close();
                    System.out.println("submitted image");
                videoListener.submitData(image);
                }
            }catch (NullPointerException e){
                NullPointerException ex = new NullPointerException("Error while processing video frames.");
            videoListener.notifyFailure(ex);
            }

            processingVideo.set(false);

        });
    }


  


  I sent the whole method for a bit more context but realistically speaking the only part that is of real significance is the converter.conver(cloneFrame) ; I used the intelliJ profiler and also the debugger and this is exactly where the problem occurs. When convert is called after doing some stuff it eventually ends up in this method :

  


          public <t extends="extends" buffer="buffer"> void getPixels(int x, int y, int w, int h, WritablePixelFormat<t> pixelformat, T buffer, int scanlineStride) {&#xA;            int fss = this.frame.imageStride;&#xA;            if (this.frame.imageChannels != 3) {&#xA;                throw new UnsupportedOperationException("We only support frames with imageChannels = 3 (BGR)");&#xA;            } else if (!(buffer instanceof ByteBuffer)) {&#xA;                throw new UnsupportedOperationException("We only support bytebuffers at the moment");&#xA;            } else {&#xA;                ByteBuffer bb = (ByteBuffer)buffer;&#xA;                ByteBuffer b = (ByteBuffer)this.frame.image[0];&#xA;&#xA;                for(int i = y; i &lt; y &#x2B; h; &#x2B;&#x2B;i) {&#xA;                    for(int j = x; j &lt; x &#x2B; w; &#x2B;&#x2B;j) {&#xA;                        int base = 3 * j;&#xA;                        bb.put(b.get(fss * i &#x2B; base));&#xA;                        bb.put(b.get(fss * i &#x2B; base &#x2B; 1));&#xA;                        bb.put(b.get(fss * i &#x2B; base &#x2B; 2));&#xA;                        bb.put((byte)-1);&#xA;                    }&#xA;                }&#xA;&#xA;            }&#xA;        }&#xA;</t></t>

  


  Now, everything up until this point is fine. The memory usage is at around 130mb but alas, when execution enters in these 2 for loops that's where the downright stupid memory usage occurs. Every single one of these bb.put calls is netting me around 3 more megabytes of memory usage. By the end of it you can probably guess what happens. Also all of these memory allocations do happen on the stack so I'm assuming that's why my memory usage stops at around 8-8.5 gigabytes otherwise the program would crash (that has also happened, out of memory exception thrown, but it doesn't usually happen, it kind of just lingers at those 8 gigabytes.) Frankly speaking I'm at a bit of a loss. I haven't seen virtually anyone anywhere mention this ever and I ran out of things to try to fix this so I am making this post.

  


  By the way another thing I tried is make the ExecutorService in the same class as the main method and when I submitted there I also didn't have these memory problems.

  


• Discord slash command music bot stops playing unexpectedly

  29 juillet 2023, par Shelby

  This is a bot I am using to play music and it worked just fine for a while until it didn't. Simply loaded the bot and played for about a minute and quits. From what I see it destroys the entire queue of songs, no matter how many are there. And after that it won't respond to any command and it needs to be reloaded. I don't get any error in the terminal and all the other commands seem to work just fine. Also, this happens to whatever query I use, whether it's 'search', 'url' or 'playlist'.

  


  const { SlashCommandBuilder } = require("@discordjs/builders")
const { EmbedBuilder } = require("discord.js")
const { QueryType } = require("discord-player")

module.exports = {
    data: new SlashCommandBuilder()
        .setName("play")
        .setDescription("Asculta muzica")
        .addSubcommand((subcommand)=>
            subcommand
                .setName("song")
                .setDescription("Incarca o singura melodie printr-un url")
                .addStringOption((option) => option.setName("url").setDescription("url-ul melodiei").setRequired(true)))
        .addSubcommand((subcommand) =>
            subcommand
                .setName("playlist")
                .setDescription("Incarca un playlist printr-un url")
                .addStringOption((option) => option.setName("url").setDescription("url-ul playlist-ului").setRequired(true)))
        .addSubcommand((subcommand) =>
            subcommand
                .setName("search")
                .setDescription("Cauta o melodie pe baza cuvintelor-cheie")
                .addStringOption((option) => 
                    option.setName("cautare").setDescription("cauta dupa titlu si autor").setRequired(true))),
        
        run: async ({ client, interaction }) => {
            if (!interaction.member.voice.channel)
                return interaction.editReply("Trebuie sa fii pe un voice channel pentru a folosi aceasta comanda!")

            const queue = await client.player.createQueue(interaction.guild)
            if (!queue.connection) await queue.connect(interaction.member.voice.channel)

            let embed = new EmbedBuilder()

            if (interaction.options.getSubcommand() === "song"){
                let url = interaction.options.getString("url")
                const result = await client.player.search(url, {
                    requestedBy: interaction.user,
                    searchEngine: QueryType.YOUTUBE_VIDEO
                })

                if (result.tracks.length === 0)
                    return interaction.editReply("Niciun rezultat")

                const song = result.tracks[0]
                await queue.addTrack(song)
                embed
                    .setColor(0xF07459)
                    .setDescription(`**[${song.title}](${song.url})** a fost adaugata`)
                    .setThumbnail(song.thumbnail)
                    .setFooter({ text: `Durata: ${song.duration}`})

            } else if (interaction.options.getSubcommand() === "playlist"){
                let url = interaction.options.getString("url")
                const result = await client.player.search(url, {
                    requestedBy: interaction.user,
                    searchEngine: QueryType.YOUTUBE_PLAYLIST
                })

                if (result.tracks.length === 0)
                    return interaction.editReply("Niciun rezultat")

                const playlist = result.playlist
                await queue.addTracks(result.tracks)
                embed
                    .setColor(0xF07459)
                    .setDescription(`**${result.tracks.length} melodii din [${playlist.title}](${playlist.url})** au fost adaugate`)

            } else if (interaction.options.getSubcommand() === "search"){
                let url = interaction.options.getString("cautare")
                const result = await client.player.search(url, {
                    requestedBy: interaction.user,
                    searchEngine: QueryType.AUTO
                })

                if (result.tracks.length === 0)
                    return interaction.editReply("Niciun rezultat")

                const song = result.tracks[0]
                await queue.addTrack(song)
                embed
                    .setColor(0xF07459)
                    .setDescription(`**[${song.title}](${song.url})** a fost adaugata`)
                    .setThumbnail(song.thumbnail)
                    .setFooter({ text: `Durata: ${song.duration}`})
            }
            if (!queue.playing) await queue.play()
            await interaction.editReply({
                embeds: [embed]
            })
                
        }
}


  


  This is the code for the [play] command. No change was done since it worked perfectly.

  


  After some research I found out that there might be a problem with the ffmpeg or the ytdl. I tried updating or reinstalling them, but the problem still remains. I would like to know if I'll need to rework the bot to find an alternative to these two.