Add Linux support for downloading and setting up FFmpeg.

This commit introduces platform-specific functionality for downloading, extracting, and configuring FFmpeg on Linux systems.

convertor/view_setting_button_download_ffmpeg_anyos.go

@@ -1,5 +1,5 @@
-//go:build !windows
-// +build !windows
+//go:build !windows && !linux
+// +build !windows,!linux
 
 package convertor
 

convertor/view_setting_button_download_ffmpeg_linux.go

@@ -0,0 +1,63 @@
+//go:build linux
+// +build linux
+
+package convertor
+
+import (
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/canvas"
+	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/widget"
+	"github.com/nicksnyder/go-i18n/v2/i18n"
+	"golang.org/x/image/colornames"
+	"image/color"
+)
+
+func (v View) blockDownloadFFmpeg(
+	donwloadFFmpeg func(progressBar *widget.ProgressBar, progressMessage *canvas.Text) error,
+) *fyne.Container {
+
+	errorDownloadFFmpegMessage := canvas.NewText("", color.RGBA{R: 255, G: 0, B: 0, A: 255})
+	errorDownloadFFmpegMessage.TextSize = 16
+	errorDownloadFFmpegMessage.TextStyle = fyne.TextStyle{Bold: true}
+
+	progressDownloadFFmpegMessage := canvas.NewText("", color.RGBA{R: 49, G: 127, B: 114, A: 255})
+	progressDownloadFFmpegMessage.TextSize = 16
+	progressDownloadFFmpegMessage.TextStyle = fyne.TextStyle{Bold: true}
+
+	progressBar := widget.NewProgressBar()
+
+	var buttonDownloadFFmpeg *widget.Button
+
+	buttonDownloadFFmpeg = widget.NewButton(v.app.GetLocalizerService().GetMessage(&i18n.LocalizeConfig{
+		MessageID: "download",
+	}), func() {
+		buttonDownloadFFmpeg.Disable()
+
+		err := donwloadFFmpeg(progressBar, progressDownloadFFmpegMessage)
+		if err != nil {
+			errorDownloadFFmpegMessage.Text = err.Error()
+		}
+
+		buttonDownloadFFmpeg.Enable()
+	})
+
+	downloadFFmpegFromSiteMessage := v.app.GetLocalizerService().GetMessage(&i18n.LocalizeConfig{
+		MessageID: "downloadFFmpegFromSite",
+	})
+
+	return container.NewVBox(
+		canvas.NewLine(colornames.Darkgreen),
+		widget.NewCard(v.app.GetLocalizerService().GetMessage(&i18n.LocalizeConfig{
+			MessageID: "buttonDownloadFFmpeg",
+		}), "", container.NewVBox(
+			widget.NewRichTextFromMarkdown(
+				downloadFFmpegFromSiteMessage+" [https://github.com/BtbN/FFmpeg-Builds/releases](https://github.com/BtbN/FFmpeg-Builds/releases)",
+			),
+			buttonDownloadFFmpeg,
+			errorDownloadFFmpegMessage,
+			progressDownloadFFmpegMessage,
+			progressBar,
+		)),
+	)
+}