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• When I use the hevc_videotoolbox encoder in ffmpeg it always prompts me the same error

  18 février 2023, par 张益铭

  when i use

  


  ffmpeg -i BabyShark.mp4 -c:v hevc_videotoolbox -b:v 6000k BabyShark1.mp4


  


  it always returns an error like

  


  


  [hevc_videotoolbox @ 0x7fec79206e00] Error encoding frame : -12905
[hevc_videotoolbox @ 0x7fec79206e00] popping : -542398533 Error
initializing output stream 0:0 — Error while opening encoder for
output stream #0:0 - maybe incorrect parameters such as bit_rate,
rate, width or height [aac @ 0x7fec79208a80] Qavg : 13693.864 [aac @
0x7fec79208a80] 2 frames left in the queue on closing Conversion
failed !

  


  


  but

  


  ffmpeg -i BabyShark1.mp4 -c:v h264_videotoolbox -b:v 6000k BabyShark2.mp4


  


  works fine.

  


  Other tutorials say that the above error is a problem of out-of-sync audio and video
But I changed a lot of videos, the error still appears, even the videos I recorded myself.
How can i fix it.

  


  My computer model is MacBook Pro 2019
I want to use GPU to convert video to H265 encoding

  


  Same problem with a computer using another M1 chip With GPU

  


• ffmpeg not finding system/speaker audio device

  6 octobre 2022, par user4609276

  I'm trying to screen record with audio, and the video portion is fine but I can't record audio because ffmpeg can only find my microphone, but not my speaker/system audio.

  


  [AVFoundation indev @ 0x135f046a0] AVFoundation video devices:
[AVFoundation indev @ 0x135f046a0] [0] FaceTime HD Camera
[AVFoundation indev @ 0x135f046a0] [1] Capture screen 0
[AVFoundation indev @ 0x135f046a0] AVFoundation audio devices:
[AVFoundation indev @ 0x135f046a0] [0] MacBook Pro Microphone


  


  Python Code

  


  os.system(f"""ffmpeg -f avfoundation -video_device_index 1 -i "default:none" -t 00:00:05 -y -r 10 recording{x}.mov""")


  


  Is there a reason why it's not picking up the system audio ? I tried looking around and struggling to find an answer.

  


  Thanks in advance

  


• Sending 2 streams to FFmpeg from nodejs

  18 août 2019, par Sylens

  I am trying to send 2 ReadableStreams to FFmpeg from nodejs. I have tried using fluent-ffmpeg library to do this, but it only supports sending one stream for processing. Check here

  My problem is :
  I have 2 incoming mono audio streams, I want to send them to ffmpeg to create a stereo stream, which I will then send to google’s speech to text service, to generate a transcription.

  I am successfully receiving both the mono streams to the nodejs server.
  How to utilize FFmpeg to merge them in realtime is still unclear, I could spawn a FFmpeg child process, but I’m not sure how to give 2 ReadableStreams as inputs and get the output as another stream ? FFmpeg supports multiple input streams.

  I can merge the 2 mono streams if they are in two separate files with this code.

  const { spawn } = childProcess;
  
  const ffmpeg = spawn('ffmpeg', [
  
    '-i', this.phoneAudioFile,
  
    '-i', this.micAudioFile,
  
    '-filter_complex', '[0:a][1:a]amerge=inputs=2[a]',
  
    '-map', '[a]',
  
    this.outputLosslessFile,
  
  ]);

  How can I acheive the same using 2 streams instead of 2 files ?

  EDIT

  • The incoming streams both have PCM audio data.
  • This entire process runs on a linux Ubuntu server.
  • The final output must be a wav file.