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• ffmpeg does not follow vframes

  15 décembre 2020, par oo92

  I'm trying to take screenshots of Twitch streams through the API using ffmpeg. I want to take 500 screens per category but I am getting an average of 50 screenshots. This is what I have :

  


  username = streams_now[i]['channel']['name']
id = streams_now[i]['id']
game = streams_now[i]['game']
game = game.translate(str.maketrans({':':'-', ' ':'-', "'":'', '!':'', '&':'_', '.':'', '+':'_'}))
streaming = streamlink.streams('http://twitch.tv/' + username)
stream = streaming["best"].url
dir_path = current_dir + '/logorec-dataset/' + game
os.mkdir(dir_path)

subprocess.call('ffmpeg -i ' + stream + f' -ss 20 -threads 2 -vframes 500 -r 1 -f image2 -strftime 1 {dir_path}/%Y%m%d%H%M%S_' + str(id) +'_'+ '.jpg&', shell=True)



  


• how to add subtitle and watermark on multi videos at same time in ffmpeg ?

  16 novembre 2020, par shadymelad

  i want to know how to add sutitle and watermark for maulti videos on one folders by FFMPEG like game of thrones all episode ?
i make watermark for all folders one time by useing thie code

  


  


  for %i in ("C :\Users\fady\Downloads\convert*.mp4") do ffmpeg -i "%i"
-i C :\Users\fady\Downloads\convert\fady.png -filter_complex "overlay=main_w-overlay_w-10:10" -codec:a copy
"C :\Users\fady\Downloads\convert\new% ni.mp4"

  


  


  but i want to add subtitle on the code
any one can help ?

  


  update
i try this code

  


  


  ffmpeg -i .mkv -i Cima2u.png -filter_complex "[0]subtitles=.srt[v] ;[1][v]scale2ref=w='iw*10/100':h='ow/mdar'[wm][vid] ; [vid][wm]overlay=main_w-overlay_w-5:main_h-overlay_h-5" -preset fast % ni.mp4

  


  


  but this for one file if i want to make it for folder many files can i ?

  


• Why after rendering with ffmpeg, file size did not decrease ?

  15 avril 2021, par ptrra

  PROBLEM : After rendering a certain video with ffmpeg file size increased from 4GB to 6GB.
  
ORIGINAL VIDEO : EE1.mkv
  
FFMPEG COMMAND : ffmpeg -i EE1.mkv -c:a copy -c:v libx264 -crf 23 -preset medium -profile:v high out.mp4
  
QUESTIONS : Why did the file size increase ? What am I doing wrong ?

  


   !DETAILS !
  
After a few years I made about 30 gaming videos (130GB) and with the current covid-19 situation I started recording my online classes (about 40 videos or 150GB). Now because I'm lacking space on my 1TB external HDD I started getting into ffmpeg. Before I was only using obs-studio and not good parameters for recording.

  


  I was using CBR mode for recording, either 5000KB or 15000KB bit rate with varying x264 presets and profiles because I was also experimenting with them. Usually superfast preset with high profile. So I wanted to convert all those videos with ffmpeg using CRF 23, medium preset and high profile. A note that when I'm recording with obs-studio it's set to record in matroska format (.mkv).

  


  When I was rendering my online classes videos with these settings I managed to achieve 10x better compression with the same quality. And when rendering my gaming videos I managed to achieve up to 3x better compression with the same quality. However there is this one video that when rendered with the same parameters the file size increases.

  


  The EE1.mkv should be recorded with CBR 15000KB bit rate, with superfast preset and high profile. Also the game that is recorded in this video is Empire Earth which needs around 8000KB for it to look good. Everything more than 8000KB is not needed.

  


  Thank you all for your help.