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• Downloading an HLS stream : ONLY in sync when downloading with ffmpeg. Possible explanations ? [closed]

  20 janvier 2024, par R.JEON

  I'm trying to download a livestream that is just a plain hls with no encryption.
I usually use streamlink, but this site I'm trying to use recently doesn't output a correct video/audio synced output when downloaded with streamlink/yt-dlp/nm3u8dl etc.

  


  The only option that produces the correct output with the audio and video in sync is ffmpeg, but ffmpeg is very user-unfriendly and lacks functionality related to retries when connection is lost, and etc.

  


  This is super weird cuz when I play the hls stream using VLC or any other livestream supported players, they are on sync. But what I do noticed is that when I play them on a player, the audio is mute for a second or two and then plays the audio correctly.

  


  Can anyone possibly explain the cause of this situation and probably a fix ? I would love to use streamlink instead of ffmpeg.

  


• How to create random pass names in ffmpeg ?

  5 mai 2022, par tuqueque

  Normally, when using ffmpeg, you define a name for the "pass" information to be stored in a file when enconding videos with 2 (or more) passes, e.g. :

  


  ffmpeg -i "INPUT_FILE" -pass 1 -passlogfile videopass.log /dev/null -y && ffmpeg -i "INPUT_FILE" -pass 2 -passlogfile videopass.log -y "OUTPUT_FILE"


  


  I'd love to be able to create a random pass name automatically in bash in the simplest way possible, preferably a "one-liner" using the system's default tools (Linux)... something like :

  


  $(tr -dc A-Za-z0-9 urandom | head -c 8).log | ffmpeg -i "INPUT_FILE" -pass 1 -passlogfile > /dev/null -y && ffmpeg -i "INPUT_FILE" -pass 2 -passlogfile > -y "OUTPUT_FILE"


  


  I'm too stupid to figure out a way of doing something similar that actually makes sense.

  


  Thank you very much in advance !

  


• FFmpeg four audiochannels but the first two are static noise

  2 octobre 2014, par sebastian

  I have a handful of videos with one audio stream in which includes four audio channels. I am having trouble in getting the last two channels wherein lies the actual sound. I don’t want to create wave files or anything like that I just want to create a video out of it with the two channels correct channels (three and four). I was thinking about using the -map 0:a:2 and -map 0:a:3 but it does not work quite as well as I had hoped for. Does anyone know a better way or what I am doing wrong ?
  Any help would be appreciated.

  Audio
  
  ID : 2
  
  Format : PCM
  
  Format settings, Endianness : Big
  
  Format settings, Sign : Unsigned
  
  Codec ID : lpcm
  
  Duration : 3mn 54s
  
  Bit rate mode : Constant
  
  Bit rate : 6 144 Kbps
  
  Channel(s) : 4 channels
  
  Sampling rate : 48.0 KHz
  
  Bit depth : 24 bits
  
  Stream size : 172 MiB (3%)
  
  Language : English
  
  Encoded date : UTC 2014-09-25 16:54:09
  
  Tagged date : UTC 2014-09-25 16:55:41