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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.

  


• Convert m3u8 File URL to a GIF File [closed]

  30 juin 2023, par nxsi

  I have a m3u8 File URL that I got using the MusicKit API (Apple Music) which is an animated cover art for an album. (A quick side question on that. Is m3u8 the only format that Apple Music returns for animated cover arts ?)

  


  So, Now that I have that m3u8 file URL, I want to convert it to a GIF for the ease of use of GIFs.
I've tried using ffmpeg but I don't really seem to make it work at all with NodeJS.

  


  Here is a sample File URL of what Apple Music returns (https://mvod.itunes.apple.com/itunes-assets/HLSMusic116/v4/cb/ac/9e/cbac9e42-0c8a-9798-0016-52ce447cdc78/P359486356_default.m3u8)

  


  TLDR ;
1- Is m3u8 the only format of animated cover arts that the MusicKit api returns ?
2- Can I convert that m3u8 file URL to a GIF, If so, How ?
3- Are there any other ways than ffmpeg to use in NodeJS ?

  


  I've tried using ffmpeg and the furthest I got was a GIF that was corrupted and not done correctly.
Here is the command I tried :

  


  ffmpeg -i "https://mvod.itunes.apple.com/itunes-assets/HLSMusic116/v4/cb/ac/9e/cbac9e42-0c8a-9798-0016-52ce447cdc78/P359486356_default.m3u8" -vf "fps=10,scale=320:-1:flags=lanczos" output.gif