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• How to smoothly increase / decrease in zoom in and zoom out using ffmpeg in zoompan ?

  3 avril 2023, par dinesh indn

  I have created a new web application which functions as a screen recording tool.

  


  For instance, users can initiate the recording process, and once complete, they can proceed to the editing panel. Within the editing panel, there are various options available such as video zooming in and out based on duration, X and Y coordinates, etc.

  


  As a backend developer, I have utilized the FFmpeg library in Node.js. Although I have successfully implemented some of the zoom in and out functionalities, I am experiencing some difficulty in achieving smooth transitions.

  


  This is the command which I used for output video.

  


  ffmpeg -i input.mp4 -vf " zoompan=z='if(between(in_time,0,04),2,1)':d=1:x='iw/2-(iw/(zoom+0.01)/2)':y='ih/2-(ih/zoom/2)',zoompan=z='if(between(in_time,05,09),2,1)':d=1:x='iw/2-(iw/(zoom+0.01)/50)':y='ih/2-(ih/zoom/1)',zoompan=z='if(between(in_time,11,15),2,1)':d=1:x='iw/50-(iw/(zoom+0.01)/10)':y='ih/2-(ih/zoom/2)' ,zoompan=z='if(between(in_time,18,20),2,1)':d=1:x='iw/2-(iw/(zoom+0.01)/1)':y='ih/2-(ih/zoom/50)' ,zoompan=z='if(between(in_time,22,25),2,1)':d=1:x='iw/30-(iw/(zoom+0.01)/50)':y='ih/2-(ih/zoom/50)', zoompan=z='if(between(in_time,27,30),2,1)':d=1:x='iw/2-(iw/(zoom+0.01)/2)':y='ih/50-(ih/zoom/30)'" output.mp4

  


  Please find below the input video and the output video which I have processed :

  


  Input video : https://fidi-screen-records.s3.ap-south-1.amazonaws.com/videos/sam.mp4

  


  Output video : https://fidi-screen-records.s3.ap-south-1.amazonaws.com/finalVideos/1678798893088_24d034f7469b5e79_x3JT9w.mp4

  


  Ideally, I would like to achieve an output similar to the following video :

  


  Expected output video : https://twitter.com/mickeyxfriedman/status/1631360293564715008?s=46&t=LlV2Tx37C24-F4xCMdZuaA

  


  Could you help me to do smooth zoom in and out transition like the expected video which I shared ?
Do I need to add any packages ? or Do I have to make any changes in my coding ?

  


• Cannot set duration for one image while converting images to mp4 using ffmpeg

  20 février 2023, par Peter.k

  I can't set duration for single image in the video. There are 24 images from here :
http://luna1.diviner.ucla.edu/~jpierre/diviner/level4_polar/hourly_maps/south/polar_south_80_summer_tbol-hour" named in for each %02d.png (concat this to get links). I use code

  


  ffmpeg -i e:\gals\moon\polar_south_80_summer_tbol-hour%02d.png -t 0.2 -r 5 -vcodec mpeg4 e:/test.mp4


  


  and always get 1 second video, but I need to have 0.2 seconds for each image, hence the whole video should be 4.8s. Someone in different threat say I need to set -framerate 5, to get 0.2s for each image, but this doesn't work. I use many variants of parameters : -d 4.8 -r 5, or -t 4.8 -r 5, or -r 24, and always get 1s of the whole video. Setting -loop 1 gets desired lenght, but it loops many times wrongly framed images.

  


  Please give me some advice.

  


• voiceclient.play(discord.FFmpegPCMAudio) doesn't play any audio

  23 septembre 2021, par mm3239

  I'm trying to create a private music bot. It joined voice channel, but no sound came out and queue didn't worked. My play function is like this :

  


  async def play_music(self):
    if len(self.music_queue) > 0:
        self.is_playing = True

        index = self.music_queue[0][0]['index']

        #connecting to voice channel
        if not self.vc.is_connected():
            self.vc = await self.music_queue[0][1].connect()
        else:
            await self.vc.move_to(self.music_queue[0][1])

        self.music_queue.pop(0)

        self.vc.play(discord.FFmpegPCMAudio(self.music_files[index], **self.FFMPEG_OPTIONS), after=lambda e: self.play_next())


  


  When I execute the file, it should work like this :

  


  Me: /play abc.mp3
Bot: Song added to queue.
*abc song plays in voice channel*
Me: /play def.mp3
Bot: Song added to queue.
Me: /play ghi.mp3
Bot: Song added to queue.

Me: /queue
Bot: def.mp3
     ghi.mp3


  


  However, in reality, Discord :

  


  Me: /play abc.mp3
Bot: Song added to queue.
*silence*
Me: /play def.mp3
Bot: Song added to queue.
Me: /play ghi.mp3
Bot: Song added to queue.

Me: /queue
Bot: No music in queue.


  


  Console :

  


  music found!&#xA;[[{&#x27;index&#x27;: 2, &#x27;title&#x27;: &#x27;abc.mp3&#x27;}, <voicechannel>]]&#xA;music found!&#xA;[[{&#x27;index&#x27;: 0, &#x27;title&#x27;: &#x27;def.mp3&#x27;}, <voicechannel>]]&#xA;&#xA;music found!&#xA;[[{&#x27;index&#x27;: 1, &#x27;title&#x27;: &#x27;ghi.mp3&#x27;}, <voicechannel> position=5 bitrate=64000 user_limit=10 category_id=790202432072187909>]]&#xA;</voicechannel></voicechannel></voicechannel>

  


  I can see something's wrong(abc and def prints shorter message in console, middle part of message is skipped), but as you can see, it doesn't raise any error or exception. Could anyone please help me correct my code ? I'm completely stuck, and it would be really appreciated if someone could tell me what the problem is.