$ sudo apt install yt-dlp ffmpeg (1)
$ git clone https://github.com/obra/Youtube2Webpage
$ cd Youtube2Webpage
$ ./yt-to-webpage.pl "【MTG】NetBSDのご紹介 2023-7-29 C-5" 'https://www.youtube.com/watch?v=TnviEtERcVw' (2)
$ python3 -m http.server --bind 127.0.0.1 --directory ./"【MTG】NetBSDのご紹介 2023-7-29 C-5" 8080 (3)
$ xdg-open http://127.0.0.1:8080/index.html (4)

$ git diff ./yt-to-webpage.pl
diff --git a/yt-to-webpage.pl b/yt-to-webpage.pl
index 41b8acf..4174658 100755
--- a/yt-to-webpage.pl
+++ b/yt-to-webpage.pl
@@ -15,7 +15,7 @@ if (!$url || $url !~ m|^https://www.youtube.com|) {

 mkdir($slug);
 chdir($slug);
-my $video_file = `yt-dlp --console-title  --write-auto-subs --write-subs "$url" --print filename --no-simulate`;
+my $video_file = `yt-dlp --console-title  --write-auto-subs --write-subs --sub-langs ja "$url" --print filename --no-simulate`;
 chomp($video_file);
 my ($vtt) = glob('*.vtt');
 open(my $fh, "<", $vtt);

$ git diff ./styles.css
diff --git a/styles.css b/styles.css
index 156f994..8972e87 100644
--- a/styles.css
+++ b/styles.css
@@ -56,8 +56,8 @@ li {
 }

 li img{
-    max-width: 288px;
-    max-height: 216px;
+    max-width: 1280px;
+    max-height: 720px;
     transition: all 0.3s;
 }

$ virtualenv .
$ source bin/activate
$ pip install twspace-dl
$ twspace_dl
usage: twspace_dl [-h] [-v] [-s] [-k] [-l] [--input-cookie-file COOKIE_FILE] [--username USERNAME]
                  [--password PASSWORD] [--output-cookie-file OUTPUT_COOKIE_FILE] [-i SPACE_URL | -U USER_URL]
                  [-d DYN_URL] [-f URL] [-M PATH] [-o FORMAT_STR] [-m] [-p] [-u] [--write-url URL_OUTPUT]

Script designed to help download twitter spaces

optional arguments:
  -h, --help            show this help message and exit
  -v, --verbose
  -s, --skip-download
  -k, --keep-files
  -l, --log             create logfile
  --input-cookie-file COOKIE_FILE

input:
  -i SPACE_URL, --input-url SPACE_URL
  -U USER_URL, --user-url USER_URL
  -d DYN_URL, --from-dynamic-url DYN_URL
                        use the dynamic url for the processes(useful for ended spaces) example: https://prod-
                        fastly-ap-
                        northeast-1.video.pscp.tv/Transcoding/v1/hls/zUUpEgiM0M18jCGxo2eSZs99p49hfyFQr1l4cdze-
                        Sp4T-DQOMMoZpkbdyetgfwscfvvUkAdeF-I5hPI4bGoYg/non_transcode/ap-northeast-1/periscope-
                        replay-direct-prod-ap-northeast-1-public/audio-space/dynamic_playlist.m3u8?type=live
  -f URL, --from-master-url URL
                        use the master url for the processes(useful for ended spaces) example: https://prod-
                        fastly-ap-northeast-1.video.pscp.tv/Transcoding/v1/hls/YRSsw6_P5xUZHMualK5-ihvePR6o4Qmo
                        ZVOBGicKvmkL_KB9IQYtxVqm3P_vpZ2HnFkoRfar4_uJOjqC8OCo5A/non_transcode/ap-
                        northeast-1/periscope-replay-direct-prod-ap-northeast-1-public/audio-
                        space/master_playlist.m3u8
  -M PATH, --input-metadata PATH
                        use a metadata json file instead of input url (useful for very old ended spaces)

output:
  -o FORMAT_STR, --output FORMAT_STR
  -m, --write-metadata  write the full metadata json to a file
  -p, --write-playlist  write the m3u8 used to download the stream(e.g. if you want to use another downloader)
  -u, --url             display the master url
  --write-url URL_OUTPUT
                        write master url to file

login:
  --username USERNAME
  --password PASSWORD
  --output-cookie-file OUTPUT_COOKIE_FILE

$ twspace_dl -i https://twitter.com/i/spaces/1ypKdEXLdLqGW

2022-03-16 15:42:16,496 [INFO] ./tmp6swcs0w5/(辻 伸弘 (nobuhiro tsuji))ゆくアレ、くるアレ #セキュリティのアレ-1ypKdEXLdLqGW.m3u8 written to disk
[hls @ 0x55f2ea4a9800] Changing ID3 metadata in HLS audio elementary stream is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
size=   51141kB time=01:13:21.68 bitrate=  95.2kbits/s speed=10.6x
2022-03-16 15:49:14,334 [INFO] Finished downloading
$ ffprobe -i ./\(辻\ 伸弘\ \(nobuhiro\ tsuji\)\)ゆくアレ、くるアレ\ #セキュリティのアレ-1ypKdEXLdLqGW.m4a
ffprobe version 4.4.1-3+b2 Copyright (c) 2007-2021 the FFmpeg developers
  built with gcc 11 (Debian 11.2.0-18)
  configuration: --prefix=/usr --extra-version=3+b2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from './(辻 伸弘 (nobuhiro tsuji))ゆくアレ、くるアレ #セキュリティのアレ-1ypKdEXLdLqGW.m4a':
  Metadata:
    major_brand     : M4A
    minor_version   : 512
    compatible_brands: M4A isomiso2
    title           : ゆくアレ、くるアレ #セキュリティのアレ
    artist          : 辻 伸弘 (nobuhiro tsuji)
    encoder         : Lavf58.76.100
    episode_id      : 1ypKdEXLdLqGW
  Duration: 01:13:21.71, start: 0.000000, bitrate: 95 kb/s
  Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 93 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]

$ ffmpeg -i ./\(辻\ 伸弘\ \(nobuhiro\ tsuji\)\)ゆくアレ、くるアレ\ #セキュリティのアレ-1ypKdEXLdLqGW.m4a -af silenceremove=stop_periods=-1:stop_duration=1:stop_threshold=-50dB -acodec libopus ./\(辻\ 伸弘\ \(nobuhiro\ tsuji\)\)ゆくアレ、くるアレ\ #セキュリティのアレ-1ypKdEXLdLqGW.opus

$ dpkg-query -W python3 ffmpeg
ffmpeg  7:4.4.1-3+b2
python3 3.9.8-1
$ lsb_release -dr
aDescription:   Debian GNU/Linux bookworm/sid
Release:        unstable
$ arch
x86_64

$ youtube-dl ${URL}
$ yt-dlp ${URL}

$ ffprobe -i ./YOUTUBEFILE.mkv 2>&1 | grep ^Input -A99
Input #0, matroska,webm, from './YOUTUBEFILE.mkv':
  Metadata:
    HTTP://YOUTUBE.COM/STREAMING/OTF/DURATIONS/112015: Segment-Count: 6109
                    : Segment-Durations-Ms: 5067,5066,5067(r=1),5066,5067(r=1),5066,5067(r=1),5066,5067(r=1),5066,5067(r=1),5066,5067(r=1),5066,5067(r=1),5066,5067(r=1),5066,5067(r=1),5066,5067(r=1),5066,5067(r=1),5066,5067(r=1),5066,5067(r=1),5066,5067(r=1),5066,5067(r=1),506
                    :
                    :
    ENCODER         : Lavf58.20.100
  Duration: 08:35:50.04, start: 0.000000, bitrate: 551 kb/s
    Stream #0:0(eng): Video: vp9 (Profile 0), yuv420p(tv, bt709/unknown/unknown), 1280x720, SAR 1:1 DAR 16:9, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)
    Metadata:
      DURATION        : 08:35:49.996000000
    Stream #0:1(eng): Audio: aac (LC), 44100 Hz, stereo, fltp (default)
    Metadata:
      HANDLER_NAME    : ISO Media file produced by Google Inc.
      DURATION        : 08:35:50.040000000

$ ffmpeg -i ./YOUTUBEFILE.mkv -vn -acodec copy ./YOUTUBEFILE.aac

$ ffmpeg -i ./YOUTUBEFILE.mkv -vn -acodec libopus -b:a 64k ./YOUTUBEFILE.opus

$ ffmpeg -i ./YOUTUBEFILE.mkv -vn -af silenceremove=stop_periods=-1:stop_duration=1:stop_threshold=-90dB -acodec libopus -b:a 32k ./YOUTUBEFILE.opus

$ youtube-dl --version
2021.12.17
$ yt-dlp --version
2022.03.08.1
$ dpkg-query -W ffmpeg
ffmpeg  7:4.1.8-0+deb10u1
$ lsb_release -dr
Description:    Debian GNU/Linux 10 (buster)
Release:        10
$ arch
x86_64

$ youtube-dl -f 91 $YOUTUBELIVEURL -o - | ffmpeg -i - -c:a copy -vn -f adts udp://127.0.0.1:1234

$ ffplay udp://127.0.0.1:1234

$ ffmpeg -i tty.gif tty.mp4

$ ffmpeg -f lavfi -i anullsrc -i tty.gif -shortest tty.mp4

$ ffprobe tty.mp4 2>&1 | grep -E "Stream.*Video"
    Stream #0:0(und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuv444p, 802x750, 73 kb/s, 4.17 fps, 4.17 tbr, 12800 tbn, 8.33 tbc (default)

$ ffmpeg -i tty.gif -pix_fmt yuv420p -filter_complex "scale=trunc(iw/2)*2:trunc(ih/2)*2" tty.mp4
$ ffprobe tty.mp4 2>&1 | grep -E "Stream.*Video"
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1058x750, 97 kb/s, 16.08 fps, 16.08 tbr, 12352 tbn, 32.17 tbc (default)

$ dpkg-query -W ffmpeg
ffmpeg	7:4.1.4-1+b2
$ lsb_release -dr
Description:	Debian GNU/Linux bullseye/sid
Release:	unstable
$ uname -m
x86_64

$ adb shell dumpsys package com.instagram.android | grep -E 'versionCode|versionName'
    versionCode=175574628 minSdk=23 targetSdk=28
    versionName=113.0.0.39.122
$ adb shell getprop ro.bootimage.build.fingerprint
essential/mata/mata:10/QP1A.190711.122/420:user/release-keys
$ adb shell getprop ro.build.version.security_patch
2019-09-05
$ adb shell getprop ro.product.cpu.abilist
arm64-v8a,armeabi-v7a,armeabi