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sile /
Last active Jul 30, 2019


  • Optunaというハイパーパラメータ最適化ツールを使って、FFmpegでの動画エンコードパラメータの最適化を試してみた結果のメモ
  • 具体的には、決められた制約(後述)下で、画質(SSIM)を最大化するようなパラメータ群を自動で見つけ出すのが目的
  • 結果としては、
    • 画質的には、FFmpegが提供しているプリセットの中で二番目に重いもの(slower)より若干良い程度のパラメータ群が見つかった
    • また、Optunaが見つけたパラメータ群の方がslowerに比べて、CPU負荷が小さかった






興味ある方は twitter @mizchi へのリプライorDM、または まで。

View gist:9c4afcd91fe24316cbf0
func openbrowser(url string) {
var err error
switch runtime.GOOS {
case "linux":
err = exec.Command("xdg-open", url).Start()
case "windows":
err = exec.Command("rundll32", "url.dll,FileProtocolHandler", url).Start()
case "darwin":
err = exec.Command("open", url).Start()
Chaser324 /
Last active Sep 19, 2019
GitHub Standard Fork & Pull Request Workflow

Whether you're trying to give back to the open source community or collaborating on your own projects, knowing how to properly fork and generate pull requests is essential. Unfortunately, it's quite easy to make mistakes or not know what you should do when you're initially learning the process. I know that I certainly had considerable initial trouble with it, and I found a lot of the information on GitHub and around the internet to be rather piecemeal and incomplete - part of the process described here, another there, common hangups in a different place, and so on.

In an attempt to coallate this information for myself and others, this short tutorial is what I've found to be fairly standard procedure for creating a fork, doing your work, issuing a pull request, and merging that pull request back into the original project.

Creating a Fork

Just head over to the GitHub page and click the "Fork" button. It's just that simple. Once you've done that, you can use your favorite git client to clone your repo or j

firstdoit /
Created Aug 30, 2013
Compress PDF files with ghostscript

This can reduce files to ~15% of their size (2.3M to 345K, in one case) with no obvious degradation of quality.

ghostscript -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/printer -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf

Other options for PDFSETTINGS:

  • /screen selects low-resolution output similar to the Acrobat Distiller "Screen Optimized" setting.
  • /ebook selects medium-resolution output similar to the Acrobat Distiller "eBook" setting.
  • /printer selects output similar to the Acrobat Distiller "Print Optimized" setting.
  • /prepress selects output similar to Acrobat Distiller "Prepress Optimized" setting.
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