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• ffmpeg v4l2 taking 100% cpu usage

  16 novembre 2022, par didentifier

  I am on Fedora 37, version is irrelevant as I had same issue on Fedora 36.

  


  I am using the following command to send video from my usb video card to v4l2loopback and the CPU usage goes to 100% and I can't do much more on my computer (i5-8600k, nvidia 2060 rtx, 16GB ram).

  


  ffmpeg -nostdin -threads 1 -f video4linux2 -video_size 1920x1080 -input_format mjpeg -i /dev/video1 -f v4l2 -preset fast -c:v copy /dev/video0

  


  previously the command was like that and the rest of the arguments was added to see if it makes any difference, it seems it doesn't change much

  


  ffmpeg -f video4linux2 -video_size 1920x1080 -input_format mjpeg -i /dev/video1 -f v4l2 -c copy /dev/video0

  


  To be honest I don't know much about ffmpeg or video in general, I was using the same command a few months ago on the same hardware with almost 0 impact to my performance, I could play games and watch videos at the same time while now I get 15 FPS in my games while I am using ffmpeg. Did anything change in ffmpeg ? Any improvements to my ffmpeg command ? Shouldn't ffmpeg not encode anything if I am using pixelformat and frame rate supported by my usb video card and if that is true shouldn't be super light ?

  


• How to rename the .wav file which is going to download using the below program ?

  29 avril 2020, par Y V Sravan Kumar Reddy

  from __future__ import unicode_literals
import youtube_dl

ydl_opts = {
    'format': 'bestaudio/best',
    'postprocessors': [{
        'key': 'FFmpegExtractAudio',
        'preferredcodec': 'wav',
        'preferredquality': '192'
    }],
    'postprocessor_args': [
        '-ar', '16000'
    ],
    'prefer_ffmpeg': True,
    'keepvideo': True
}

with youtube_dl.YoutubeDL(ydl_opts) as ydl:
    ydl.download(['https://www.youtube.com/watch?v=JpjEwIceVIo'])


  



  ---

  



  Output :

  



  [youtube] JpjEwIceVIo: Downloading webpage
[download] Speech on Importance of Education in English for Higher Secondary students by Smile Please World-JpjEwIceVIo.webm has already been downloaded
[download] 100% of 1.69MiB
[ffmpeg] Destination: Speech on Importance of Education in English for Higher Secondary students by Smile Please World-JpjEwIceVIo.wav


  



  ---

  



  I want to change the filename to audio1.wav instead of Speech on Importance of Education in English for Higher Secondary students by Smile Please World-JpjEwIceVIo.wav. Please help me with this problem.

  


• How to download video streaming powered by JW Player 8.4.2 + iframe src from hydrax.net combined ? [on hold]

  20 octobre 2019, par Tév

  I find that downloading a video that streamed via JW Player 8.4.2. which using hydrax.net as the media source is really annoying & frustrating because I’ve done my best with the all solution I’ve found comes to nothing.

  Is there any solution left I can try ?

  I’m trying to download video from http://javmile.com/dvd/anna-marie-patsukin-channel-z-vol/39585 with ffmpeg & youtube-dl but not worked.

  I tried to stream/convert the .m3u8 file I managed to download with VLC but still not worked.

  I also tried to look for the alternative from Inspect -> Network -> Media and all that I got is a blob link that ends dead end. Inspect -> Application also doesn’t provide any solution since there’s no Video frame.

  Last but not least, I’ve tried the Video DownloadHelper extension from Firefox trick to download the video from the referrer/url link but it’s failed too.

  ---

  The referrer link I’ve got from the Video DownloadHelper Firefox’s extension :

  https://hydrax.net/watch?v=5b9ff9a0f032b

  ---

  The url link I’ve got from the Video DownloadHelper Firefox’s extension :

  https://www.googleapis.com/drive/v3/files/1nJ5512Z8I0t9go8pQQE9xVLnO03WCzai?alt=media&key=AIzaSyDAFci7RjYNlmLG8txIQJCYFrfApf21Ulc

  ---

  The blob link that’ll lead me to the .m3u8 file download :

  blob :https://hydrax.net/e9166d00-1aba-4832-b7bf-8cb011abcc10

  ---

  And here the .m3u8 file content I’ve managed to download :

  EXTM3U
  EXT-X-VERSION:3
  EXT-X-STREAM-INF:BANDWIDTH=394000,RESOLUTION=480x360
  blob :https://hydrax.net/acaacae5-2ad3-4447-9aab-cbabe2a1e5ee#VzWiWxKoXzlaWQpyuPfhdPjzQsCR8zJFWzrcgqTL1MkLQQlWKgjJKMV6Xzs
  EXT-X-STREAM-INF:BANDWIDTH=1998000,RESOLUTION=1280x720
  blob :https://hydrax.net/710d4b51-9334-469d-9146-8af650529982#VzWiWxKoXzBaWfrjQfFFg8gi1L06u40fJsf5QzVkKSrLJrfht5Bk84lRXzs
  EXT-X-STREAM-INF:BANDWIDTH=2998000,RESOLUTION=1920x1080
  blob :https://hydrax.net/1130dfbe-dab1-402e-9309-5d562c68424b#VzWiWxKoXzfaW8pl1r0H8LJAVPFWOsffV41hCgZeBPV7K5fJfrBpQf0DXzI

  ---

  Command that I used to download the video with the ffmpeg :

  ffmpeg -i [neither of referrer/url link from DownloadHelper nor blob link from the .m3u8 file content worked] -vcodec copy -acodec copy MyOutput.mp4

  ---

  Command that I used to download the video with the youtube-dl :

  youtube-dl -i [neither of referrer/url link from DownloadHelper nor blob link from the .m3u8 file content worked] -vcodec copy -acodec copy MyOutput.mp4