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• Can't save ffmpeg output in Nodejs

  8 septembre 2020, par humble_button

  I have a problem with saving the preview from the .mp4 file. I followed this tutorial, but I got the Error : ffmpeg exited with code 1 : C :\Users\Lenovo\Documents\My projects\YouTube\routes : Permission denied. I don't know how to deal with it, the 'outputPath' is simplestrong text "public/uploads/previews". I am on Windows 10.

  


  return ffmpeg()
            .input(inputPath)
            .inputOptions([`-ss ${startPreviewInSec}`])
            .outputOptions([`-t ${previewDurationInSec}`])
            .noAudio()
            .format("gif")
            .output(outputPath)
            .on("end", resolve)
            .on("error", reject)
            .run();


  


• Auto-Transcode/Compress .mkv to .mp4 on Qnap TS-251+

  9 novembre 2020, par DarkDiamond

  I rip my DVDs with MakeMKV in order to be able to watch them on my TV, as I do not have a DVD-player that supports any output connector that fit into my TV as the TV is relatively new whereas the DVD-player is quite old. (As I only use the rips for my personal entertainment and do not share them there is absolutely no copyright problem).

  


  The problem with the output files is the extreme size as they are the raw data from the disk. Now I would like these files to be compressed into a .mp4 file as soon as they are finished. The problem is that the file is created before everything is in it, so I probably need to write it into a local drive and copy it to its destination later. Then I will copy them to my Qnap NAS TS-251+.

  


  There I want it do be compressed into a much smaller .mp4 file (usually the .mp4s are a sixth of the original size). I found something using ffmpeg, so I just need a script that does this for me. I do not mind to use a Docker machine for it, but I do not know how to do it. I found this :

  


  ffmpeg -i input.mkv -c:v -crf 18 -preset veryslow -c:a copy out.mp4 here.

  


  I also found this video, so I know it is in theory possible, I just do not know how to realise it.

  


  In case you ask why I want to use the Qnap NAS, it allows hardware acceleration, whereas my laptop does not.

  


• FFMPEG on Heroku worker dynos takes too long - runs into timeout error

  26 janvier 2021, par John

  I am encoding a large video file that on my 5-year-old laptop runs at 7X and finishes in about 5 minutes. But with 2X worker dynos on heroku it cant even finish before the 4 hour background job time limit. I didn't have any issues until 2 days ago and now its causing lots of probelms. If I run heroku run rails console and run the job manually, I see it start at 7X but then quickly go down to 2X and then 0.5X speed. Anyone know what is causing this issue ?

  


  I'm encoding a VP8 webm file to MP4. If anyone knows a faster way to do this that might also fix this issue that would be great too !

  


  ffmpeg -y -i #{temp_webm_file.path} -movflags faststart -preset ultrafast #{temp_mp4_file.path}