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• ffmpeg images-to-video script anyone ?

  3 février 2014, par danja

  I'm wanting to take a bunch of images and make a video slideshow out of them. There'll be an app for that, right ? Yup, quite a few it seems. The problem is I want the slides synced to a piece of music, and all the apps I've seen only allow you to show each slide for a multiple of a whole second. I want them to show for multiples of 1.714285714 seconds to fit with 140 bpm.

  The tools I've seen generally seem to have ffmpeg under the hood, so presumably this kind of thing could be done with a script. But ffmpeg has sooo many options...I'm hoping someone will have something close.

  I'll have up to about 100 slides, the ones that have to show for 3.428571428 secs or whatever I guess I can simply show twice.

• Am I able to stream .mp4 file with the appropriate stream key ?

  8 octobre 2022, par akumakan

  Expected Results :
Right now, this is the code that I am trying to edit. What this does is that I input a name (example.mp4) and it take the contents from a notepad with my stream keys and streams the .mp4 file I input. I want it so that I have .mp4 files with the names as stream keys and the program streams it with the appropriate stream key in the notepad. Is that possible ?

  


  Initial code :

  


  import subprocess

print("Enter the name of the file you want to stream. Include the file extension.\nExample: lofi.mp4 or image.png or pogchamp.gif")
filename = input("\nFilename: ")
with open('stream_keys.txt','r')as keys:
    for key in keys:
        subprocess.Popen(f'ffmpeg -stream_loop -1 -re -i {filename} -stream_loop -1 -i music.mp3 -c:v libx264 -preset veryfast -b:v 3000k -maxrate 3000k -bufsize 6000k -pix_fmt yuv420p -g 50 -c:a aac -b:a 160k -ac 2 -ar 44100 -f flv "rtmp://live.twitch.tv/app/{key}"', shell=True)


  


  What I tried :
Im not proficient with coding and i tried to change the filename into keys.mp4 thinking it will have my expected results.

  


  
print("Edit Names of .mp4 files with twitch stream keys")
open('stream_keys.txt','r')as keys:
    for key in keys:
        subprocess.Popen(f'ffmpeg -stream_loop -1 -re -i {key}.mp4 -stream_loop -1 -i music.mp3 -c:v libx264 -preset veryfast -b:v 3000k -maxrate 3000k -bufsize 6000k -pix_fmt yuv420p -g 50 -c:a aac -b:a 160k -ac 2 -ar 44100 -f flv "rtmp://live.twitch.tv/app/{key}"', shell=True)


  


  thank you

  


• How to get audio peaks with FFmpeg ?

  2 septembre 2020, par hmak.me

  I am working on a music app and need to generate audio spectrum for my files. Like this one :

  



  

  



  So I tried using audiowaveform like this :

  



  audiowaveform -i music.mp3 --pixels-per-second 1 -o out.dat


  



  which gives me the following results[correct results] : [the first 10 words are meta data]

  



  0000000 0001 0000 0000 0000 bb80 0000 bb80 0000
0000020 00f9 0000 df3e 1fa2 e22c 1ef3 e0bb 1e5a
0000040 e099 1e88 dfcf 1c33 e29f 1d4c e055 1f80
0000060 df63 1e3a e1b4 1f31 e271 1d81 e0e5 1b1c
0000100 e06d 1be4 dee2 1cb0 e118 1da1 e026 1dea
0000120 e055 1dac df9b 1dbf e0c3 2063 ded4 21b2
0000140 dec9 1f8d de5b 20c8 e02d 216a dd7e 21af
0000160 dea1 20ac de6c 2170 de80 1e12 de6f 1fb9
0000200 dde3 2106 e0d9 21be de88 218c de81 1f9f
0000220 decb 20ff deb2 1edc df32 20c4 dde7 ...


  



  But when I do this kind of job with FFmpeg :

  



  ffmpeg -y -i music.mp3 -acodec pcm_s16le -f s16le -ac 1 -ar 1 -v quiet out.pcm


  



  that gives the following results, which is not same at all :

  



  0000000 0001 fffe fffe fffe 0000 ffff fffd 0000
0000020 ffff ffff fffe 0001 0001 fffd 0001 fffe
0000040 0002 fffe fffc 0002 ffff fffc fffe 000b
0000060 0007 fffb 0004 0001 ffff fffd ffff 0002
0000100 0008 0006 fffe ffff 0001 0000 0003 000a
0000120 fffd ffff 0004 ffff 0001 ffff fffd ffff
0000140 fffe ffff 0001 fffd fffe 0000 fffb 0002
0000160 0002 0000 fffe 0000 fffb fffe fffe 0000
0000200 ffff 0000 ffff fffc 0002 0003 0005 0003
0000220 0002 fffb fffb fffa fffa 0004 0009 ...


  



  You may wonder that why am i doing -ar 1 or --pixels-per-second 1 ? This is because I want to draw a line for each second, so I need to get peak for each second. . I don't know what am I missing there but I expect to get the same results from FFmpeg.