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• 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!

  


• 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.

• Extracting audio from video using fluent-ffmpeg

  12 March, by Idi Favour

  Im trying to extract the audio from a video, an error is occuring
Error converting file: Error: ffmpeg exited with code 234: Error opening output file ./src/videos/output-audio.mp3.
Error opening output files: Invalid argument

  


  I use this same directory for my video compression that runs before this one and it works.

  


  ffmpeg()
  .input(url)
  .audioChannels(0)
  .format("mp3")
  .output("./src/videos/output-audio.mp3")
  .on("error", (err) => console.error(`Error converting file: ${err}`))
  .on("end", async () => {
    console.log("audio transcripts");
   
    const stream = fs.createReadStream("./src/videos/output-audio.mp3");
    const transcription = await openai.audio.transcriptions.create({
      file: stream,
      model: "whisper-1",
      response_format: "verbose_json",
      timestamp_granularities: ["word"],
    });
    transcripts = transcription.text;
    console.log(transcription.text);
  })
  .run();