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• yt-dlp how to download a specific video using timestamps, and limiting the download resolution ?

  30 septembre 2023, par ignacM

  I am running a python program to download a video, this is the command I use :

  


  command = ['powershell.exe ffmpeg',
                   '-ss', str(start),
                   '-i', '$(yt-dlp',
                   '-f', 'bestvideo[ext=webm]',

                   '-g', '"%s")' % (url_base + video_identifier),
                   '-t', str(end - start),
                   '-c:v', 'libx264', '-c:a', 'copy', '%s' % output_filename]

command = ' '.join(command)
output = subprocess.check_output(command, shell=True, stderr=subprocess.STDOUT)


  


  This prints something like
powershell.exe ffmpeg -ss 10 -i $(yt-dlp -f bestvideo[ext=webm] -g "https://www.youtube.com/watch?v=Z15erfLqNKo") -t 10 -c:v libx264 -c:a copy C :\Users...\video.mp4

  


  This works perfectly fine. However, I tried to download a video that had very high resolution (4K) and I want to limit the resolution when downloading. I have found that placing [height<=1080] as so should work :

  &#xA;

  powershell.exe ffmpeg -ss 10 -i $(yt-dlp -f bestvideo[ext=webm][height<=1080] -g "https://www.youtube.com/watch?v=Z15erfLqNKo") -t 10 -c:v libx264 -c:a copy C :\Users...\video.mp4

  &#xA;

  However this does not work for me and gives me the error :&#xA;Error command "" returned non-zero exit status 1.&#xA;Output : b'The system cannot find the file specified.\r\n'

  &#xA;

  I also have noticed that only limiting the resolution does not work for me either :

  &#xA;

  powershell.exe ffmpeg -ss 10 -i $(yt-dlp -f bestvideo[height<=1080] -g "https://www.youtube.com/watch?v=Z15erfLqNKo") -t 10 -c:v libx264 -c:a copy C :\Users...\video.mp4

  &#xA;

  Actually, placing [height<=1080] after bestvideo never works, no matter what I do.

  &#xA;

  What could be the problem ? Or what command can I run to achieve both tasks (limit resolution and download specific timeframe (not whole video and cutting it)) ?

  &#xA;

• FFMPEG - speed up/slow down video, add jitter etc

  27 septembre 2019, par Darrell

  I’m trying to put together a Windows script that will process short videos in a folder.
  The videos will be shot at a high frame rate 60+ fps and be about 4-5 secs long.

  Basically I am looking to make various style clips, using fast/slow effects, back and forth etc.
  So, the script might process a video, make it start normal speed, then slow motion. Next video might be normal speed, slomo, normal speed slomo. Next video might be forwards,back, forwards back, slomo.

  See example : (this is a compliation, I’m looking at processing individual videos in a folder.)

  http://www.youtube.com/watch?v=K03IBQZu8SQ

  I’m guessing there is no way to do this, other than splitting a clip using FFMPEG, processing the bits, then merging back together ? I can’t seem to find a way to do it as one clip.

• ffmpeg convert vp9 video to mp4

  6 mai 2017, par Sulli

  I am using this command

  ffmpeg -i $youtubeUrl -strict -2 -c copy output.mp4

  (with $youtubeUrl generated by youtube-dl) to download this youtube video : https://www.youtube.com/watch?v=wnCJhq-JOck

  I can’t play the downloaded video though on Ubuntu or Windows (for a problem of vp09 codec) and I have to convert the video to webm and then back to mp4 to be able to play it :

  ffmpeg -i output.mp4 -vcodec libvpx-vp9 -strict experimental output_2.webm
  
  ffmpeg -i output_2.webm -strict 2 output_3.mp4

  This happens only with some youtube videos, not all of them.

  Is there a way to download all youtube videos in a readable format with only one command line, without having to convert to webm ?