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• 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)


  


• Writing H.264 RTP stream data to a container file

  2 avril 2018, par Kamal

  In a call, I receive RTP packets (h264 payload). I am trying to depacketize it and write it to a container file like mkv or mp4 using ffmpeg. However the output file is not playing. I am following below steps, please let me know whats wrong here.

  1. Got RTP packet
  2. Removed RTP header 12 bytes
  3. Read one more byte and calculated F, NRI & Type value. Type value comes to 1 most of the time, sometime it is 5 also.
  4. Since type is in between 1 & 23, it is of type single NAL unit.
  5. Allocates a buffer say BUF.
  6. Writes first 3 byte as 0x00 0x00 0x01.
  7. Then copy from video payload + 1 offset (since we have read 1 byte as described in point #3) to BUF
  8. Use this BUF to prepare avpacket and write this to output file using AV_Write_* API of ffmpeg. This part I have done correctly as it works fine for me in case of vp8 codec.
  9. Get the output file.
  10. However this file is not playing in ffmpeg.

  Please let me know of my approach is correct.

  I have observed sometimes group of packets coming with marker bit as 0, with same RTP timestamp. Do I need to concatenate such group of packets and write as single NALU, or each packet I should write as single NALU to output file.

• 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