Ask HN: Can I see your cheatsheet?

Re:Ask HN: Can I see your cheatsheet? by vince14 on Thursday June 30, 2022 @04:47AM (#31930095)

Creating clips from tv recordings:

    ffmpeg -ss 01:59:00.000 -i "interlaced.ts" -ss 00:00:12.000 -t 26 -max_muxing_queue_size 1024 -c:a libopus -b:a 96k -c:v libx264 -crf 20 -vf "yadif=1" -profile:v baseline -level 3.0 -pix_fmt yuv420p -movflags +faststart -y clip.mp4

Make clip compatible with WhatsApp:

    ffmpeg -i in.mp4 -map 0:v:0 -map 0:a:0 -map_metadata -1 -map_chapters -1 -c:v libx264 -preset slow -tune film -crf 32 -c:a aac -b:a 128k -profile:v baseline -level 3.0 -pix_fmt yuv420p -movflags +faststart out.mp4

Copying in various terminals:

    PuTTY: select
    tmux: Shift + select
    cmd: select + Enter in quick edit mode
    Windows Terminal: select + Right Click

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Re:Ask HN: Can I see your cheatsheet? by ww520 on Thursday June 30, 2022 @04:58AM (#31930146)

Most streaming sites break a video into many small fragments, which are listed in a m4mu file. I have a script to download the fragments one by one using curl. To merge the video fragments back into one file, I do the following.

  Merge video files with ffmpeg
  - Make a file listing all the videos in sequence. E.g.
     file 'video01.ts'
     file 'video02.ts'
     file 'video03.ts'
     ...
  - Generate the file list for files in the current directory.
      (for %i in (*.ts) do @echo file '%i') > filelist.txt
  - ffmpeg command to combine videos
     ffmpeg -f concat -safe 0 -i filelist.txt -c copy output.mp4

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Re:Ask HN: Can I see your cheatsheet? by corobo on Thursday June 30, 2022 @05:33AM (#31930343)

For anyone needing this youtube-dl (and ffmpeg if you need post-dl conversion) can do this for you if it's any easier, point it at the index file and let it do its thing

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Re:Ask HN: Can I see your cheatsheet? by ww520 on Thursday June 30, 2022 @01:10PM (#31935479)

Youtube-dl is great. I just wanted to build it from scratch, and it was very simple once the underlying streaming tech was understood.

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Re:Ask HN: Can I see your cheatsheet? by unraveller on Saturday July 02, 2022 @07:12AM (#31958034)

I find -vf bwdif much smoother than yadif for action sport replays.

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