This is a simple UI tool for viewing full transcripts in a way that you can actually copy them. No software needed and it should work with any Mac with the Podcasts app just by visiting the website, https://alexbeals.com/projects/podcasts/. All you have to do is follow the instructions and drag-and-drop your podcasts folder.
This all works locally without uploading anything, which you can confirm by disabling the Internet after the website is loaded.
Once you drag and drop your files you can browse all of the episodes with transcripts.
Clicking on any of them will pull up the full transcript, which you can copy and paste to whatever tool you want to handle the file in.
The data is locally stored in ~/Library/Group Containers/243LU875E5.groups.com.apple.podcasts/Library/Cache/Assets/TTML. The tool also pulls in the .sqlite folder to display additional information about the podcast to make it easier to find the one you're looking for. Shoutout to @mattdanielmurphy and his repo here which I found when originally trying to do this for a podcast.
Loading files doesn't work just by opening from file:// in your browser, so instead use Python to set up a local server at http://localhost:8000/.
python3 -m http.server
The "tests" folder also contains .zip files that should continue to work.
Great question. This issue was the key. But the compiling steps were a nightmare, so I just manually modified the sql-wasm.js file. Will need to do this again with a version boost. Specifically you can look for the dbfile_ bit in code, find the if(null!=g) code and copy it with a different variable (and the '-wal' suffix in the filename definition).
Original:
function e(g){this.filename="dbfile_"+(4294967295*Math.random()>>>0);if(null!=g){var l=this.filename,n="/",t=l;n&&(n="string"==typeof n?n:ja(n),t=l?x(n+"/"+l):
n);l=ka(!0,!0);t=la(t,(void 0!==l?l:438)&4095|32768,0);if(g){if("string"==typeof g){n=Array(g.length);for(var w=0,A=g.length;w<A;++w)n[w]=g.charCodeAt(w);g=n}ma(t,l|146);n=na(t,577);oa(n,g,0,g.length,0);pa(n);ma(t,l)}}
Replacement:
function e(g,zzz){this.filename="dbfile_"+(4294967295*Math.random()>>>0);if(null!=g){var l=this.filename,n="/",t=l;n&&(n="string"==typeof n?n:ja(n),t=l?x(n+"/"+l):
n);l=ka(!0,!0);t=la(t,(void 0!==l?l:438)&4095|32768,0);if(g){if("string"==typeof g){n=Array(g.length);for(var w=0,A=g.length;w<A;++w)n[w]=g.charCodeAt(w);g=n}ma(t,l|146);n=na(t,577);oa(n,g,0,g.length,0);pa(n);ma(t,l)}}if(null!=zzz){var l=this.filename+"-wal",n="/",t=l;n&&(n="string"==typeof n?n:ja(n),t=l?x(n+"/"+l):
n);l=ka(!0,!0);t=la(t,(void 0!==l?l:438)&4095|32768,0);if(zzz){if("string"==typeof zzz){n=Array(zzz.length);for(var w=0,A=zzz.length;w<A;++w)n[w]=zzz.charCodeAt(w);zzz=n}ma(t,l|146);n=na(t,577);oa(n,zzz,0,zzz.length,0);pa(n);ma(t,l)}}