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• Join 8 mono channels into 7.1 audio stream

  10 juin 2020, par Rafal B

  I'm trying to join 8 mono channels into 7.1 channels layout :

  



  ffmpeg -i L.ac3 -i R.ac3 -i C.ac3 -i Sub.ac3 -i BL.ac3 -i BR.ac3 -i SL.ac3 -i SR.ac3 -filter_complex "[0:a][1:a][2:a][3:a][4:a][5:a][6:a][7:a]join=inputs=8:channel_layout=7.1[a]"
-map "[a]" final-output.ac3


  



  but I'm getting :

  



  Stream mapping:
  Stream #0:0 (ac3) -> join:input0
  Stream #1:0 (ac3) -> join:input1
  Stream #2:0 (ac3) -> join:input2
  Stream #3:0 (ac3) -> join:input3
  Stream #4:0 (ac3) -> join:input4
  Stream #5:0 (ac3) -> join:input5
  Stream #6:0 (ac3) -> join:input6
  Stream #7:0 (ac3) -> join:input7
  join -> Stream #0:0 (ac3)
Press [q] to stop, [?] for help
Output #0, ac3, to 'final-output.ac3':
  Metadata:
    encoder         : Lavf58.29.100
    Stream #0:0: Audio: ac3, 48000 Hz, **5.1(side)**, fltp, 640 kb/s (default)
    Metadata:
      encoder         : Lavc58.54.100 ac3


  



  Why the output file is 5.1(side) ?

  



  Audio
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Commercial name                          : Dolby Digital
Duration                                 : 54 min 5 s
Bit rate mode                            : Constant
Bit rate                                 : 640 kb/s
Channel(s)                               : 6 channels
Channel layout                           : L R C LFE Ls Rs
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Compression mode                         : Lossy
Stream size                              : 248 MiB (100%)
Service kind                             : Complete Main


  



  I did not found anything that would explain this behavior.
I'm using latest ffmpeg and tried different methods : join, amerge. Always output file is 5.1(side)

  


• Trying to convert frames to a video using ffmpeg in a batch script [closed]

  21 octobre 2020, par Katzenwerfer

  I'm doing a script to convert frames into a video.

  


  @echo off
set /p ftv="Want to covert the frames to video (yes or no): "
if %ftv%==yes (echo Ok, initializing frame convertion... & timeout 1 >nul & set /p framerate="Please specify the framerate: " & set /p crf="Please specify a CRF value: " & timeout 1 >nul & ffmpeg -framerate %framerate% -i "%cd%\Interpolated_frames\%%6d.png" -c:v libx264 -preset veryslow -crf %crf% "%cd%\FinalVideo.mp4" & echo Video ready, check the folder for the final video & timeout 1 >nul)


  


  It is suppposed to let you choose the framerate and the crf value, but when running it, ffmpeg gives me Output file #0 does not contain any stream

  


  Dividing it into singular parts like this make it work, but I need to use it with the if

  


  @echo off    
echo Ok, initializing frame convertion...
timeout 1 >nul
set /p framerate="Please specify the framerate: "
set /p crf="Please specify a CRF value: "
timeout 1 >nul & ffmpeg -framerate %framerate% -i "%cd%\Interpolated_frames\%%6d.png" -c:v libx264 -preset veryslow -crf %crf% "%cd%\FinalVideo.mp4"
echo Video ready, check the folder for the final video
timeout 1 >nul


  


• FFMPEG output to the Exact Folder using Python

  6 août 2021, par Ande Caleb

  i'm working on a simple script using ffmpeg, to reduce the size of a video and add watermark to the video, then move the final output into the compressed folder... this is my script.

  


  the compression works, the watermark works, but the issue i'm having is that the final output is placed in the root folder, and not in the compressed folder... below i my folder structure and my scripts

  


  Folder Structure

  


     rootfolder
    |
    |--media
       |--vids
          |--(video files, mov, mp4s)..
       |--compressed
    |--encode.py


  


  Script (encode.py) file

  


  import os    
import subprocess
from pathlib import Path


dir_path = os.path.dirname(os.path.realpath(__file__))    
vidfile = dir_path + '/media/vids/mv1.mov'    
watermark = dir_path + '/media/watermark.png'
compressed = str(Path.cwd() / '/media/compressed/')

# 1. compress the video and store it in the media out folder

media_out = str(dir_path + "/compressed_mv1s.mov").replace(" ", "\\ ") 
subprocess.run("ffmpeg -i " + vidfile.replace(" ", "\\ ") +
               " -vcodec libx264 -crf 22 " + media_out, shell=True)  

#2.add watermark to the video and move it to the compressed folder 

media_watermarked = str(compressed + '/w_mv1.mov').replace(" ", "\\ ")
subprocess.run("ffmpeg -i " + media_out + " -i " + watermark +
               " -filter_complex \"overlay=main_w-(overlay_w+10) : main_h-(10+overlay_h)\" " + media_watermarked, shell=True)


  


  in summary, compressing the video works, adding watermark works, but the last line, the error is from the media_watermarked variable, i'm not sure what i'm doing wrong but it isn't resolving the folder correctly moving the final output to the folder.. this is the error i get

  


  

  


  Also, how can i run two ffmpeg commands concurrently to compress the video and add watermark at once without doing it seperately.
Thanks.