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• How to split audio file into equal-length segments with ffmpeg ?

  11 mars, par GPWR

  I want to split an audio file into several equal-length segments using FFmpeg. I want to specify the general segment duration (no overlap), and I want FFmpeg to render as many segments as it takes to go over the whole audio file (in other words, the number of segments to be rendered is unspecified).
Also, since I am not very experienced with FFmpeg (I only use it to make simple file conversions with few arguments), I would like a description of the code you should use to do this, rather than just a piece of code that I won't necessarily understand, if possible.
Thank you in advance.

  


  P.S. Here's the context for why I'm trying to do this :
I would like to sample a song into single-bar loops automatically, instead of having to chop them manually using a DAW. All I want to do is align the first beat of the song to the beat grid in my DAW, and then export that audio file and use it to generate one-bar loops in FFmpeg.

  


  In the future, I will try to do something like a batch command in which one can specify the tempo and key signature, and it will generate the loops using FFmpeg automatically (as long as the loop is aligned to the beat grid, as I've mentioned earlier). 😀

  


• Next drawtext clears the previous one ffmpeg

  27 août 2021, par Макс Шульдинер

  ffmpeg.exe -i ffmpeg_inputs/zheltiy_chelik.mp4  -vf "[in]drawtext=fonts/Temporarium.otf:text='r':fontcolor=orange:fontsize=100:x=(w-text_w)/2+0:y=0:enable='between(t,0, 11)', drawtext =fonts/Temporarium.otf:text = 'r':fontcolor=orange:fontsize=100:x=(w-text_w)/2+20:y=0:enable='between(t,11, 22)', drawtext =fonts/Temporarium.otf:text = 'r':fontcolor=orange:fontsize=100:x=(w-text_w)/2+40:y=0:enable='between(t,22, 33)'[out]" ffmpeg_outputs/test2.mp4 -y 


  


  There is such a ffmpeg line. Its meaning is to draw a letter 20 pixels to the right of the current position of the word every 11 seconds, and in this way "write the word". But here's the problem - when the second letter starts to render, it overwrites the first, and the third, respectively, overwrites the second. The string seems to have prescribed [in] and [out] but does not help, maybe someone has ideas

  


• ffmpeg showwaves color

  14 novembre 2022, par Andrew

  I'm trying to produce a video that has a lime green colored waveform overlayed on top of a background image. Unfortunately though, there is a grey color in the lines as you can see here :

  



  

  



  How can I make the grey parts lime green as well ?

  



  And if possible, I would like to make the lines thicker as well.

  



  Here is my ffmpeg command :

  



  ffmpeg -i input.aac -i background.jpg -filter_complex "[0:a]aformat=sample_fmts=s16:sample_rates=4410:channel_layouts=mono,showwaves=size=300x200:mode=p2p:rate=10:colors=#68b847[fg];[1:v][fg]overlay=130:150,format=yuv420p[v]" -map "[v]" -map 0:a -c:v libx264 -r 10 -c:a copy -r 10 -movflags +faststart output.mp4