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• ReSample RTP Audio data over Socket as PCM data using FFMPEG

  5 février 2020, par GJ.

  I want to receive a RTP Stream and send the raw data received in it over TCP / UDP socket. For this i am trying following commands.

  1. I am sending the RTP stream using following command.

     ffmpeg -re -i hello.wav -ar 8000 -f mulaw -f rtp rtp ://127.0.0.1:1234

  2. Receiver to re transmit the stream over TCP / UDP socket.

     ffmpeg -i rtp ://127.0.0.1:1234 -f mulaw tcp ://127.0.0.1:5555 -hide_banner

  3. A Player to play this Socket stream to verify.

     ffplay tcp ://127.0.0.1:5555 ?listen

  My second command shows that its receiving data and transmitting the data to tcp over 5555 port.

  Input #0, rtp, from 'rtp://127.0.0.1:1234':
  
    Duration: N/A, start: 0.000000, bitrate: 64 kb/s
  
      Stream #0:0: Audio: pcm_mulaw, 8000 Hz, mono, s16, 64 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (pcm_mulaw (native) -> pcm_mulaw (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, mulaw, to 'tcp://127.0.0.1:5555':
  
    Metadata:
  
      encoder         : Lavf58.29.100
  
      Stream #0:0: Audio: pcm_mulaw, 8000 Hz, mono, s16, 64 kb/s
  
      Metadata:
  
        encoder         : Lavc58.54.100 pcm_mulaw

  But the third command does not receive anything, even i tried dumping the response into a file using FFMPEG in command three but same results.

  What am i doing wrong, Please suggest the correct commands using FFMPEG.

• FFmpeg and bash, Transcode multiple files to another drive with save path

  18 juillet 2016, par Виктор Гусев

  I have folder that contain files in many different path, for example : folder1/subfolder1/file.mov
  folder1/subfolder2/file.mov

  i need to convert and copy all files to another format, and save all paths after folder 1, for example :
  folder2/subfolder1/file.mp4
  folder2/subfolder2/file.mp4

  I have this script, but it save transcoded files in original location.

  #!/bin/bash
  
  MOVIES=/Volumes/drive/
  
  find "$MOVIES" -name '*.MP4' -exec sh -c 'ffmpeg -i "$0" -map 0 -c copy "${0%%.MP4}.mov"' {} \; exit;

  Please help
  Thank you !

• FFmpeg HLS save original timestamps

  11 juillet 2016, par Ivan Kolesnikov

  I transcoding a video to HLS and everything works fine with the following command :

  ffmpeg -i source -vcodec nvenc -acodec copy -f ssegment -segment_list playlist.m3u8 -segment_list_flags +live -segment_time 60 -segment_list_size 10 out%03d.ts

  But when I want to save an original timestamps and add -copyts key to my commnad then I received new .ts file each 0.7 seconds(but I set it to 60 seconds -segment_time 60).
  How can I save an original timestamps with transcoding to HLS ?

  UPDATE : I tried this command and timestamps are saves fine :
  

  ffmpeg -i source.ts -vcodec nvenc -acodec copy -f hls -hls_time 10 -hls_list_size 5 -copyts playlist.m3u8

  But when I trying run this command for RTP input stream then I receive the following error : "Error while opening encoder for output stream #0:2 - maybe incorrect parameters such as bit_rate, rate, width or height".