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• Using ffmpeg, extract audio streams from video file and output to single stereo wav file

  8 décembre 2016, par Quantum_Kernel

  I’ve been trying for a few hours to get the right arguments to do the below operation with ffmpeg, but i’m a bit out of my depth. If anyone can give me some guidance, that would be very helpful.

  Input file is MXF with one video track and two separate 48k 24b PCM audio tracks.
  I want to extract just the audio, map first track to left, second track to right and output as a stereo wave file.

  I am trying variations on the below command, but it seems to be unhappy about the video stream, giving the error

  "mapchan : stream #0.0 is not an audio stream."

  ffmpeg -i test2.mxf -vn -map_channel 0.0.1 output.wav_CH0 -map_channel 0.0.2 output.wav_CH1

  Here is ffmpeg’s analysis of the streams in case it is helpful :

      Stream #1:0: Video: mpeg2video (4:2:2), yuv422p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], max. 50000 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
  
  Stream #1:1: Audio: pcm_s24le, 48000 Hz, mono, s32, 1152 kb/s
  
  Stream #1:2: Audio: pcm_s24le, 48000 Hz, mono, s32, 1152 kb/s
  
  Stream #1:3: Audio: pcm_s24le, 48000 Hz, mono, s32, 1152 kb/s
  
  Stream #1:4: Audio: pcm_s24le, 48000 Hz, mono, s32, 1152 kb/s
  
  Stream #1:5: Audio: pcm_s24le, 48000 Hz, mono, s32, 1152 kb/s
  
  Stream #1:6: Audio: pcm_s24le, 48000 Hz, mono, s32, 1152 kb/s
  
  Stream #1:7: Audio: pcm_s24le, 48000 Hz, mono, s32, 1152 kb/s
  
  Stream #1:8: Audio: pcm_s24le, 48000 Hz, mono, s32, 1152 kb/s

• running ffmpeg.exe from inside bash file [duplicate]

  3 février 2023, par Martin

  Hello I am trying to run ffmpeg from inside a track_cmd.sh file which I run inside command prompt using the command bash track_cmd.sh
My file looks like this :

  


  echo "try1"
C:\Users\marti\Documents\projects\jan2023-rendertune\RenderTune\node_modules\ffmpeg-ffprobe-static\ffmpeg.exe
echo "try2"
# start /d "path" file.exe
start /d "C:\Users\marti\Documents\projects\jan2023-rendertune\RenderTune\node_modules\ffmpeg-ffprobe-static" ffmpeg.exe
echo "try3"
# start "c:\windows\system32" notepad.exe   
start "C:\Users\marti\Documents\projects\jan2023-rendertune\RenderTune\node_modules\ffmpeg-ffprobe-static" ffmpeg.exe   
echo "try4"
#start "" fullPath/file.exe
start "" C:\\Users\\marti\\Documents\\projects\\jan2023-rendertune\\RenderTune\\node_modules\\ffmpeg-ffprobe-static\\ffmpeg.exe
echo "done"


  


  But none of these lines work :

  


  >bash track_cmd.sh
try1
track_cmd.sh: line 2: C:UsersmartiDocumentsprojectsjan2023-rendertuneRenderTunenode_modulesffmpeg-ffprobe-staticffmpeg.exe: command not found
try2
track_cmd.sh: line 5: start: command not found
try3
track_cmd.sh: line 8: start: command not found
try4
track_cmd.sh: line 11: start: command not found
done


  


  I have tried the examples posted in this question :
Bat file to run a .exe at the command prompt

  


  But none work. If I run the command C:\Users\marti\Documents\projects\jan2023-rendertune\RenderTune\node_modules\ffmpeg-ffprobe-static\ffmpeg.exe inside command prompt, I get ffmpeg, so I know the path works.

  


• How can I convert a regular WAV file to a 4bit WAV file using ffmpeg ?

  17 février 2020, par Florin Mircea

  I have tried something along the lines of

  C :\ffmpeg\ffmpeg -i "Blip_Select2.wav" -c:a wav -sample_fmt u8 "Blip_Select2_8bit.wav"

  but I cannot figure out how to access a 4bit conversion.

  I am using the audio for a c# project, 4 bit is sufficient and I prefer wav so I won’t have to distribute a possibly restricted usage decoder with my files.

  Edit. I have found a solution using a different software (see my answer below), but I am accepting Mattias’s answer as he provided the solution as asked, with ffmpeg.