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• What containers support pcm_s16le audio for ffmpeg ?

  24 mars 2020, par ENunn

  I’m trying to get this file working in Vegas, it’s a 4:2:2 mov file that I rendered with avisynth+/ffmpeg. I don’t want the audio sounding like crap so my audio codec is set to pcm_s16le.

  I sometimes edit these in Vegas Pro, however I’m trying to import them and I’m having so many problems. MOV has a green video, AVI is datamoshed garbage, MKV you can’t even edit in Vegas Pro (even with the MKV reader enabled). I know a "fix" for the green video, and that’s converting to 4:2:0, but I cannot stand the trailing of reds when I do it directly in Avisynth or ffmpeg. I know my final output is going to be 4:2:0 regardless but rendering it in Vegas doesn’t have those trailing reds.

  What other containers support pcm_s16le ? I’m trying to convert to as many containers as I can in ffmpeg and dial down what works best for me.

• How to do the "TV Compression" thing in FFMPEG ?

  7 août 2019, par Imageny

  I’m trying to do this thing in FFmpeg where I make the picture a little better but I also compress the audio as heavily as on TV. I’ve tried everything, but nothing seems to be working out very well. I’m making this code for a VB program.

  This is the result I want to achieve. It’s the first part of the video : https://streamable.com/3rjnp

  That part was done using the audio effects in VEGAS Pro.

  And this is the code I keep working on :

  ffmpeg -i "inputfile.mp4" -s 1920x1080 -vf "minterpolate=59.94,tblend=all_mode=average,framestep=2, colorlevels=rimin=0.039:gimin=0.039:bimin=0.039:rimax=0.96:gimax=0.96:bimax=0.96, colorlevels=rimax=0.902:gimax=0.902:bimax=0.902, noise=alls=25:allf=t+u" -af "alimiter, dynaudnorm=p=1/sqrt(2):m=100:s=12:g=15, treble=f=1803:t=o:width=6:g=15, acompressor=threshold=0.3:ratio=20:attack=5:release=50, "volume=-12.7dB", dynaudnorm=m=100:r=1:s=15:g=3, aresample=48000, alimiter, acompressor=threshold=1:release=20, "volume=20dB", loudnorm, alimiter" -vcodec mpeg4 -acodec aac -ar 48000 -b:a 256k "outputfile.mp4"

  How do I properly do it ?

• FFMPEG : Properly sidechain_compress stereo background with stereo sidechain into stereo output

  6 décembre 2023, par Eduard Sukharev

  I'm doing voiceover and since Sony Vegas does not support sidechaining, I render voiceover into voices.wav and then use sidechain_compress filter, as per ffmpeg documentation :

  



  ffmpeg -y -i background.m4a -i voices.wav -filter_complex \
    "[1:a]asplit=2[sc][mix];\
    [0:a][sc]sidechaincompress=threshold=0.015:ratio=2:level_sc=0.8:release=500:attack=1[compr];\
    [compr][mix]amerge" sidechain_1.wav


  



  voices.wav is a stereo audio file, as well as background.m4a. But here's how the result file looks like when loaded into Sony Vegas :

  



  

  



  This shows that in channels 1/2 I get the compressed background, while in channel 3 and 4 I get two mono tracks that somehow differ (probably, that's the original voices input and somewhat altered voices input, both in mono). UPD : I don't want to further process resulting tracks in Sony Vegas, I'd prefer ffmpeg to be the last step in my production process. The screenshot above is for illustration purposes only.

  



  

  1. Is the background gets sidechain compressed with only left or right channel of voices ? If so, how to change that to make it compressed by both channels (some voices are panned into left or right, so there might be actual difference in compressed result)

  


  2. What are those channels 3 and 4 ? Why are they mono ?

  


  3. How do I get single 1/2 stereo track in the output wav file instead of this weird 4 channels in 3 tracks ? (I've looked at pan complex filter, but didn't figure out how to set it up in my case).