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• ffmpeg command not working with VANC data [closed]

  3 avril 2024, par Parmesh Kumawat

  when i am running below ffmpeg command

  


  ffmpeg -i "udp://ip:port?localaddr=ip&sources=ip&overrun_nonfatal=1&buffer_size=4000000&fifo_size=1000000" -c copy -map 0 -vsync passthrough -copyts vanc_stream1.ts

  


  the bin_data for VANC is changing/not recognized saving as below output

  


  Input #0, mpegts, from 'vanc_stream_ffmpeg.ts':                                                                                                                                                            
  Duration: N/A, bitrate: N/A                                                                        
  Program 1  
  Metadata:
      service_name    : Service01 
      service_provider: FFmpeg              
      Stream #0:0[0x100]: Data: bin_data ([6][0][0][0] / 0x0006) 
      Stream #0:1[0x101]: Data: bin_data ([6][0][0][0] / 0x0006)
      Stream #0:2[0x100]: Data: bin_data ([6][0][0][0] / 0x0006) 
      Stream #0:3[0x101]: Data: bin_data ([6][0][0][0] / 0x0006)


  


  It should be saved as

  


  Stream #0:0[0x100]: Data: bin_data ([6][0][0][0] / 0x0006) 
Stream #0:1[0x101]: Data: bin_data ([6][0][0][0] / 0x0006)
Stream #0:2[0x100]: Data: bin_data (VANC / 0x434E4156) 
Stream #0:3[0x101]: Data: bin_data (VANC / 0x434E4156) 


  


  I have tried below tsp command to fetch the stream and it works fine

  


  tsp -I ip port --source ip -O file stream_capture1.ts


  


  i need the same output with ffmpeg command

  


• Feed raw data to ffmpeg from python

  27 octobre 2020, par eri

  I want to wrap h264 stream to mp4 container on fly. But ffmpeg exits after first buffer

  


  ffmpeg = subprocess.Popen("ffmpeg -f h264 -i pipe: -c copy -f mp4 -movflags frag_keyframe+empty_moov+faststart pipe:".split(), stdout=subprocess.PIPE, stdin=subprocess.PIPE)

fd = ffmpeg.stdout.fileno()
fl = fcntl.fcntl(fd, fcntl.F_GETFL)
fcntl.fcntl(fd, fcntl.F_SETFL, fl | os.O_NONBLOCK)

while True:
    data = infile.read(32768)
    ffmpeg.stdin.write(data)
    data = ffmpeg.stdout.read()
    outfile.write(data)


  


• MP3 file become silent when time changed in Firefox with audio API

  14 décembre 2022, par Simon Trichereau

  I have some problem but I need to give you some context :

  


  I have a production environment with large audio mp3 files. Everything is working perfectly but files are too heavy. I used ffmpeg to reduce their Bitrates from 320kbit/s to 190kbit/s to free space in my disk.

  


  My script worked well and I saved almost 50% of space, but before to put it in production I wanted to test it on pre-production and there is some problem with Firefox...

  


  When I play the audio everything is working good, if I listen to it normally everything is working BUT, when I click on the range to change the time and navigate into the audio, it becomes silent. Nothing happens, I can stop, start again, change the time, nothing works, but the audio is still playing...

  


  I don't have any errors in my console, nothing so the only solution is to reload the page and play again the audio without changing the time.

  


  I tried in chrome and it works like a charm, but in Firefox no. I also tried without any extensions and still the same...

  


  Do you have any idea what is happening ?

  


  Thanks a lot !

  


  --- EDIT 14/12/2022 ---

  


  Ok, I have tried a lot of different solutions and I finally found one, it seems firefox doesn't support VBR (variable bitrate) so I've compressed my file in CBR and it seems to finally work ...