CC Buchner download fails on Linux

[wollew]

This is basically a reopen of #40. It reproducingly fails when converting the last page with "Error: Empty file":

Error: Empty file
    at readFileSync (/home/user/EbookDownloader/node_modules/image-size/dist/index.js:79:19)
    at imageSize (/home/user/EbookDownloader/node_modules/image-size/dist/index.js:116:23)
    at /home/user/EbookDownloader/src/downloader/clicknstudy.js:195:32
    at Array.forEach (<anonymous>)
    at /home/user/EbookDownloader/src/downloader/clicknstudy.js:190:24
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
Error while getting book - e503

I checked the file, it is definitely not empty, npx image-size out/xxx/0628-627.jpg gives a positive result.

[wollew]

BTW, I did a little bit of analysis and the problem seems to be that at the time the JPG file is opened to read, it still has a file size of 0 bytes. The reason for this is that the last ffmpeg child has not terminated yet or rather not fully written its output to the file. I was able to fix this by describing this to Copilot and the resulting fix in clicknstudy.js worked for me. But as I have no idea of Javascript programming whatsoever, I would leave the actual fix to someone who knows how to fix this: make sure that all ffmpeg processes have their stdout closed before trying to read the resulting file.

[tuktuk5578]

Ich habe dasselbe Problem mit Click&Study. Der Hinweis von wollew brachte folgende .js Datei hervor. Vllt. hilft es jemandem als Übergangslösung.

clicknstudy.js