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• Java IO Streaming Large Files Video/Data/Sound [on hold]

  2 March 2015, by James Relic

  I have a series of questions listed below regarding java.io streaming and sockets.

  1. What is a video streaming server? How does it differ from a standard web server.

  2. Remember Napster/Morpheus etc? They’re P2P programs, did they allow users to stream data to each other? Is there a difference between streaming and downloading (on the clients end)?

  3. How would you go about writing a generic program in java that streams anything to the client , word docs, mp3 files, videos files? Would you use serverlets for this purpose?

  4. If all you are doing is sending files video/sound/docs/text etc from one computer to another would you need to use specialist APIs like FFMPEG-Java, Red5 ?

  5. if you are sending video or sound as a file supposedly you don’t need to worry about encoding or decoding?

  6. Do I need to worry about RTSP if im streaming videos as a file? Rather then wanting them to play live on the client end?

  I understand my questions sound very untechnical and basic, but I’m a little confused on this whole streaming topic and want to know the best way to stream large files of all types using the Java EE/Spring platform.

• I want FFMPEG generate the m3u8 file with the oldest segments instead of the newest

  4 June 2021, by Sandi

  I have an FFmpeg command like this:

  


   ffmpeg -i test.mp4 -f hls -hls_time 2 -hls_wrap 10 -hls_list_size 5 test.m3u8


  


  Afaik, hls_wrap is the number of segments we want to store locally and hls_list_size is the segment listed in the m3u8 output file. The command above will generate 10 files of the video segment.

  


  [seg 0][seg 1][seg 2][seg 3][seg 4][seg 5][seg 6][seg 7][seg 8][seg 9]


  


  And inside the test.m3u8, of course, there are 5 newest segments listed.

  


  [seg 5][seg 6][seg 7][seg 8][seg 9]


  


  I want the test.m3u8 lists the oldest available segment instead of the newest. So it should contain:

  


  [seg 0][seg 1][seg 2][seg 3][seg 4]


  


  In another word, I want to preload the segments before it listed in test.m3u8.

  


  The idea is I want to rsync the output of that FFmpeg command to a different folder on the network. I want to avoid test.m3u8 contains a segment that not completely copied because of the large segment size.

  


  Please help me and pardon my English. Thank you very much!

  


• How to transcode discord opus bytes wav?

  13 December 2022, by Tacokeet

  I am trying to convert discords opus audio bytes to wav bytes. I'm using the discord python library Pycord to receive opus audio. This receives opus aduio from a socket. This audio is 2 channel, 48khz.

  


  I want transcode these bytes into 1 channel 16khz wav. So that I can pass it into Pico voice their porcupine (pvporcupine) wake word detection.

  


  I tried convert the decoced data with audioop but this doesn't work.

  


  converted = audioop.ratecv(data.decoded_data, 2, 2, 48000, 16000, None)
converted = audioop.tomono(converted[0], 2, 1, 0)


  


  Pycord has a feature that it writes the bytes into a wav file. I can use ffmpeg to then transcode it into an 1 channel 16khz wav file. I can then feed this file into pvporcupine. It then detects the desired wake words.

  


  But I want to transcode the decoded bytes and then pass them into pvpvporcupine.

  


  Any help towards an answer would be appreciated.