{"id":523,"date":"2026-02-26T08:14:42","date_gmt":"2026-02-26T16:14:42","guid":{"rendered":"https:\/\/salemdata.net\/johnpress\/?p=523"},"modified":"2026-02-26T08:14:42","modified_gmt":"2026-02-26T16:14:42","slug":"extracting-links-from-pdf","status":"publish","type":"post","link":"https:\/\/salemdata.net\/johnpress\/?p=523","title":{"rendered":"Extracting Links From PDF"},"content":{"rendered":"

Here’s a walk-through where I extract video link in a PDF and ascertain the length of the videos, their YouTube address, and their title.<\/p>\n

The 291 page Voron Assembly manual has links to helpful videos within it.\u00a0 Here’s a picture of such a link, https:\/\/voron.link\/onjwmcd, from page 10 (intended to be read by a phone’s scanner).\u00a0 The links are short links to content staged on YouTube, so “https:\/\/voron.link\/onjwmcd” points to “https:\/\/www.youtube.com\/watch?t=466&v=2dvbn0rWA60&feature=youtu.be” which is a 10:23 entitled “Blind Joint Basics”.<\/p>\n

\"\"<\/p>\n

I wanted to know how many links there are the PDF, where they pointed to, and what the length of the target video is and it’s title.\u00a0 With ChatGPT, we developed this process.\u00a0 The PDF file is Assembly_Manual_Trident_Nov_28_2025.pdf<\/strong><\/p>\n

1) command<\/strong> to mine the links:<\/p>\n

pdfgrep -n -o 'https?:\/\/[^[:space:])\"]+' \\ \r\nAssembly_Manual_Trident_Nov_28_2025.pdf \\ \r\n| sort -u \\ \r\n> voron_manual_links_page_url.tsv<\/pre>\n
Example:<\/strong><\/p>\n
\"\"<\/p>\n
2) command<\/strong> to sort by page number:<\/p>\n
sort -t: -k1,1n -k2,2 voron_manual_links_page_url.tsv<\/pre>\n
Example:<\/strong><\/p>\n
\"\"<\/p>\n
Then I decided I only wanted the links the contained “voron.link”, so:<\/p>\n
3) command<\/strong> to isolate only voron.links:<\/p>\n
awk '\/voron\\.link\/ { sub(\/^[0-9]+:\/,\"\"); print }' voron_manual_links_page_url.tsv \\ \r\n| sort -u \\ \r\n> voron_shortlinks.txt<\/pre>\n
Example:<\/strong><\/p>\n
\"\"<\/p>\n
4) Determine the length and title of each video:<\/p>\n
command:<\/strong><\/p>\n
# 1) unique voron.link URLs \r\nawk '\/voron\\.link\/ { sub(\/^[0-9]+:\/,\"\"); print }' voron_manual_links_page_url.tsv \\ \r\n| sort -u > voron_shortlinks.txt \r\n\r\n# 2) enrich \r\nwhile read -r short; do \r\n\u00a0final=$(curl -sL -o \/dev\/null -w '%{url_effective}' \"$short\") \r\n\u00a0yt-dlp --no-warnings --skip-download \\ \r\n\u00a0\u00a0\u00a0--print '%(duration_string)s\\t%(title)s' \\ \r\n\u00a0\u00a0\u00a0\"$final\" 2>\/dev\/null \\ \r\n\u00a0| awk -v s=\"$short\" -v f=\"$final\" 'BEGIN{OFS=\"\\t\"} {print s,f,$0}' \\ \r\n\u00a0|| printf \"%s\\t%s\\t-\\t(METADATA_FAIL)\\n\" \"$short\" \"$final\" \r\ndone < voron_shortlinks.txt \\ \r\n> voron_videos_manifest.tsv<\/pre>\n
Example:<\/strong><\/p>\n
\"\"<\/p>\n
Where the numbers do not have colons, those represent seconds only.<\/p>\n","protected":false},"excerpt":{"rendered":"
Here’s a walk-through where I extract video link in a PDF and ascertain the length of the videos, their YouTube address, and their title. The 291 page Voron Assembly manual has links to helpful videos within it.\u00a0 Here’s a picture of such a link, https:\/\/voron.link\/onjwmcd, from page 10 (intended to be read by a phone’s […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[102,103],"class_list":["post-523","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-linux-tip","tag-pdf"],"_links":{"self":[{"href":"https:\/\/salemdata.net\/johnpress\/index.php?rest_route=\/wp\/v2\/posts\/523","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/salemdata.net\/johnpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/salemdata.net\/johnpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/salemdata.net\/johnpress\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/salemdata.net\/johnpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=523"}],"version-history":[{"count":1,"href":"https:\/\/salemdata.net\/johnpress\/index.php?rest_route=\/wp\/v2\/posts\/523\/revisions"}],"predecessor-version":[{"id":529,"href":"https:\/\/salemdata.net\/johnpress\/index.php?rest_route=\/wp\/v2\/posts\/523\/revisions\/529"}],"wp:attachment":[{"href":"https:\/\/salemdata.net\/johnpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=523"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/salemdata.net\/johnpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=523"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/salemdata.net\/johnpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=523"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}