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• Why is my discord.py bot not having voice while being hosted on Heroku ?

  24 juillet 2020, par Flying Thunder

  My bot is all set up and running, everything works, EXCEPT for voice : He joins the channel, but doesnt play audio. I have heard many different claims for what the reason is (no permission to use ffmpeg.exe, missing buildpack, missing dependency, Heroku blocking UDP on free users...) - but i hope that someone here ACTUALLY knows what the problem is, because i couldnt find any definitive reason online.

  


  This is the code of the bot : https://github.com/FlyingThunder/DiscordBot/blob/master/main.py
Everything is working fine on my machine.
This is the only error that Heroku logs gave me :
2020-07-24T06:28:30.329937+00:00 app[worker.1]: PermissionError: [Errno 13] Permission denied: 'res/ffmpeg.exe'

  


  I already tried adding https://github.com/jonathanong/heroku-buildpack-ffmpeg-latest.git to my buildpacks, and i added cffi==1.14.0 to my requirements.txt - both solutions that are supposed to fix this exact issue.

  


• FFMPEG Image to video zoompan starting position

  4 août 2018, par lchn

  In creating mp4 slideshows out of images, I’ve taken some examples online for zoompan, but I still haven’t quite grasped how to make them start from a certain location in an image. Here’s the typical command :

  ffmpeg -i image-000.jpg -filter_complex "color=c=black:r=60:s=1920x1080[demo] ;[0:v]format=pix_fmts=yuva420p,scale=8000 :-1,zoompan=z=’min(zoom+0.0005,1.2)’:s=2000x1333:d=360:x=’if(gte(zoom,0.9),x,x+1/a)’:y=’if(gte(zoom,0.9),y,y+1)’,fade=in:0:25:alpha=1,setpts=PTS-STARTPTS+0.0/TB[v0] ;[demo][v0]overlay=format=yuv420"
   t 6 -c:v libx264 -y out000.mp4

  Photos I use are typically 3x2 or 4x3 in aspect ratio, so I get that they’d have to be cut off somewhere in a 16x9 video. The thing with the above code (and many other "Ken Burns effect" samples) is that they start with the bottom portion of the images cut off, then either zoom in more or zoom out, never showing the bottom.

  How do I get the animation to start further down on the image ? Nothing I do in the y=’...’ section affects it. Not even putting in constant numbers between 0 and 100000 instead of adjusting values in that formula y=’if(gte(zoom,0.9),y,y+1)’.

  Note : I’ve had some success using crop or pad for the original image, but I’d rather understand how to better position zoompan inside of the image.

• How to convert mp4 to h264 adding AUDs using FFMPEG

  16 mars 2021, par syntheticgio

  I am trying to convert an mp4 clip to h264 bytestream format using FFMPEG. I have successfully compiled FFMPEG from source with access to libx264.

  



  Looking at the documentation for FFMPEG (version 3.2.2) under libx264 there is a bool flag -aud. In the online documentation it gives the example

  



  ffmpeg -i input.flac -id3v2_version 3 out.mp3


  



  Using this format, the following command works, but doesn't produce the desired AUDs in the output file :

  



  ffmpeg -i input.mp4 -codec:v libx264 -aud 1 output.h264


  



  I've also tried different variants with this including :

  



  ffmpeg -i input.mp4 -vcodec libx264 -aud 1 output.h264
ffmpeg -i input.mp4 -aud 1 output.h264


  



  etc.

  



  I assume there is something I'm misunderstanding about performing this operation. I basically want to take a h264 movie in an mp4 container and dump it as an h264 stream with AUDs added to it. Any idea why this isn't working ?

  



  (I've also tried using x264 with the -aud flag, also ran fine but didn't produce the desired output).