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• ffmpeg with two input rtmp streams with overlay causing 5 sec delay

  13 juin 2019, par GoodStudent

  I’m using ffmpeg on merging two videos, using overlay taking input from two rtmp streams getting lag of 5 seconds in one of the videos in stream3 .

  Below is the command I’ve tried

  ffmpeg -i rtmp://stream1  -i rtmp://stream2  
  
         -filter_complex "[0:v]scale=1280:720;[1:v]scale=320:180[v1];[v0][v1]overlay=eof_action=pass[out1]" 
  
         -map [out1]   -f flv   rtmp://stream3

  I’m expecting less than 1 sec lag in overlay as individual streams are getting less than 1 sec lag

• Revision 5daef90efc : skip un-neccessary motion search in the first pass This patch allows the encode

  4 juin 2014, par Pengchong Jin

  Changed Paths :
   Modify /vp9/encoder/vp9_firstpass.c

  
  
  skip un-neccessary motion search in the first pass

  This patch allows the encoder to skip the
  un-neccessary motion search in the first pass. It
  calculates the error of the zero motion vector using
  the last source frame as reference and skips the
  further motion search in the first pass if the error
  is small.

  The encoding speedup of the first pass for slideshow
  videos is over 30%. Borg test shows the overall PSNR
  performance remain approximately the same (derf -0.009,
  hd 0.387, yt 0.021, stdhd 0.065). Individual clips may
  have either PSNR gain or loss. The worst PSNR perfomance
  is from yt set, with a PSNR loss of -1.1.

  Change-Id : I08b2ab110b695e4689573b2567fa531b6457616e

• How do I use ffmpeg on a directory of files and have the new files retain the same name, using Bash ? [duplicate]

  31 janvier 2021, par ktb

  hopefully this will be a relatively straightforward question.

  


  I have a directory of files. The files are mkv files that contain .vtt subtitles. I want to change the vtt subtitles into .srt subtitles. Ideally the mkv files should retain the same names at the end of the process.

  


  I have this Bash command that uses ffmpeg :

  


  ffmpeg -i input.mkv -c copy -c:s srt out.mkv


  


  This command works on an individual file, in terms of giving me a new file with the correct srt subtitles muxed in.

  


  However it does not :

  


  

  • let me wildcard the mkv file (I have to specify the input.mkv file)

  


  • let me keep the name of the original mkv file

  


  


  Could someone help please ? I'm thinking it would be a relatively simple Bash loop (for x in *.mkv...) but any help would be most gratefully received. I really want the output files to have the same name as the input files at the end of the process. Thank you.