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• Getting ffmpeg to work on a nodejs server : Error : ffmpeg exited with code 1 : Output #0, wav, to 'output.wav'

  14 mai 2023, par Djaenike

  I need to convert an m4a buffer stream to a wav buffer stream. I'm trying to accomplish this through ffmpeg-static and fluent-ffmpeg on a nodejs backend. I'm using multer to process the buffer stream coming from the client, then pass it through a convertM4AToWAV, which

  


  Here is the code I'm using to establish ffmpeg and convert the buffer stream.

  


  const ffmpeg = require('fluent-ffmpeg');
const ffmpegStatic = require('ffmpeg-static');
ffmpeg.setFfmpegPath(ffmpegStatic);

...more code here for the api route...

const convertM4AToWAV = async (m4aBuffer) => {
  console.log(`buffer in: ${m4aBuffer}`);
  try {
    const wavBuffer = await ffmpeg(m4aBuffer)
      .toFormat('wav')
      .on('start', (command) => console.log('FFmpeg command:', command))
      .on('end', () => {
        console.log('Conversion complete.');
      })
      .save('output.wav');
    return wavBuffer;
  } catch (error) {
    console.error('Error converting audio buffer stream to wav:', error);
    throw error;
  }
};


  


  And here is the error message I'm seeing :

  


  //I can see the buffer come in
buffer in: ↑ftyp3gp4isom3gp4☺mdat????????.....
//I can see the command
FFmpeg command: ffmpeg -y -f wav output.wav
//Error message thrown
Error transcribing audio: Error: 13 INTERNAL: Request message serialization failure: invalid encoding
    at callErrorFromStatus
...file directory jibberish...
code: 13,
  details: 'Request message serialization failure: invalid encoding',
  metadata: Metadata { internalRepr: Map(0) {}, options: {} },
  note: 'Exception occurred in retry method that was not classified as transient'
}
error - uncaughtException: Error: ffmpeg exited with code 1: Output #0, wav, to 'output.wav':
Output file #0 does not contain any stream


  


  Any thoughts why this error is thrown ? My gut is telling me it's because I haven't configured ffmpeg correctly on the server.

  


• ffmpeg stream offset command (-itsoffset) not working

  12 juillet 2013, par jen

  I would really appreciate if someone could give some pointers regarding the use of itsoffset with ffmpeg. I have read a number of posts on this subject, some of them explain very clearly how to re-synchronize audio and video with -itsoffset, but I haven't been able to make it work.
  My avi file is encoded with ffmpeg, in two passes, using the following command for the second pass :

  ffmpeg -i whole-vts_01.avs -pass 2 -y -vcodec libxvid -vtag XVID -b:v 1300K -g 240 -trellis 2 -mbd rd -flags +mv4+aic -acodec ac3 -ac 2 -ar 48000 -b:a 128k output.avi

  For whatever reason, I end up with a 1 sec delay in the video (or the audio is 1 sec early). It doesn't happen too often but I see it from time to time.
  Among other attempts, I have tried the following :

  (1) ffmpeg -i output.avi -itsoffset 00:00:01.0 -i output.avi -vcodec copy -acodec copy -map 0:0 -map 1:1 output-resynched.avi
  
  (2) ffmpeg -i output.avi -itsoffset 00:00:01.0 -i output.ac3 -vcodec copy -acodec copy -map 0:0 -map 1:0 output-resynched2.avi
  
  (3) ffmpeg -itsoffset -00:00:01.00 -i output.avi output-resynched8.avi
  
  (4) ffmpeg -i output.avi -itsoffset -1.0 -i output.avi -vcodec copy -acodec copy -map 0:1 -map 1:0 output-resynched13.avi

  Here are the results :

  1. Audio garbled and only 5m 35 s long vs. 1h 41m.
  2. (Output.ac3 is audio component of output.avi) Video and audio
     identical to original, offset didn't work
  3. Audio did get shifted, but original encoding parameters replaced with default ones (as expected).
  4. Audio garbled and only 9m 56s long vs. 1h 41m.

  I see that many people explain, and apparently use the process described above, but it doesn't seem to be working for me. Am I missing something obvious ? I would very much like to be able to use -itsoffset as it is cleaner than my workaround solution.

  FWIW, here is a different, and longer way of obtaining the desired result :

  First create a shifted video only file using -ss :

  ffmpeg -i output.avi -ss 1.0 -vcodec copy -an oupput_videoshifted.avi

  Then extract the audio :

  ffmpeg -i output.avi -vn -acodec copy outputaudioonly.ac3

  And finally remux both components :

  ffmpeg -i output_videoshifted.avi -i output_audioonly.ac3 -vcodec copy -acodec copy -map 0:0 -map 1:0 output-resynched14.avi

  The process works, is fast enough, but I would really prefer to use the one pass -itsoffset solution.

• Using Python script to cut long videos into chunks in FFMPEG

  23 février 2016, par Michael Hamilton

  Starting off by saying I’m not a programmer, but I really need the application this Python script I found says it can do.

  Auto-Splitting Script by Antarctic Nest of Icephoenix

  Basically I have a directory of long .MP4s that need to be cut into equal parts based on a total running time of 3 hours 15 minutes. For example, I would have an 8 hour video that needs to be cut into smaller parts each under 3:15:00.

  We’ve been manually crating FFMPEG codes to do this, but I found the Python script above that seems like it will do what we are needing. The issue is that I have no Python experience. I don’t know where in the script to enter in the folder path with the videos, or where to specify my codecs, or where to tell the program that the max time for each video chunk is 3:15:00.

  I’m on a 64-bit windows system working in command prompt

  Here’s what I have done :

  • Installed python 3
  • downloaded the script
  • I can click on the script to see the cmd window flash to indicate it’s running
  • I enter "C :\Python34\python.exe V :\ffmpeg\ffmpeg-split.py" into cmd

  • output is

    File "V :\ffmpeg\ffmpeg-split.py", line 16
    print "Split length can’t be 0"

      SyntaxError: Missing parentheses in call to 'print'

  I have no idea where to go from here. It seems like the script is loading properly, but I haven’t entered my variables. Any help with where to put the information would be appreciated.

  Here is the FFMPEG code we usually use :

  ffmpeg -i V :\ffmpeg\88518_63c392af.mp4 -vcodec libx264 -acodec copy -vf fps=fps=30000/1001 -ss 00:05:01.000 -t 02:43:49.000 V :\events\88518.mp4

  The ffmpeg codes we use :

  -i is a .mp4

  -vcodec h.264 codec

  -acodec should be “copy” or can be “libvo_aacenc”

  -vf fps=30000/1000 a forced fps of 29.97

  -ss is start time (we would use this to manually cut into parts along with -t)

  -t is duration (we would calculate the duration for each part as the total run time divided by the equal time under 3:15:00 be it two, three, or four parts)

  Thank you a million dollars