Hide irrelevant bitrate controls by mode

DONE.md

@@ -824,6 +824,7 @@ This file tracks completed features, fixes, and milestones.
 - ✅ Restored 25%/33%/50%/75% target size reduction presets
 - ✅ Default bitrate preset set to 2.5 Mbps and added 2.0 Mbps option
 - ✅ Default encoder preset set to slow
+- ✅ Bitrate mode now strictly hides unrelated controls (CRF only in CRF mode)
 - ✅ Stabilized video seeking and embedded rendering
 - ✅ Improved player window positioning
 - ✅ Fixed clear video functionality

TODO.md

@@ -57,6 +57,7 @@ This file tracks upcoming features, improvements, and known issues.
   - Target size reduction presets restored (25/33/50/75%)
   - Default bitrate preset set to 2.5 Mbps with added 2.0 Mbps option
   - Default encoder preset set to slow
+  - Bitrate mode hides unrelated controls (CRF only in CRF mode)
 
 *Last Updated: 2025-12-20*
 

main.go

@@ -6346,6 +6346,9 @@ func buildConvertView(state *appState, src *videoSource) fyne.CanvasObject {
 		supportsLossless := codecSupportsLossless(state.convert.VideoCodec)
 
 		hint := ""
+		showCRF := mode == "CRF" || mode == ""
+		showBitrate := mode == "CBR" || mode == "VBR"
+		showTarget := mode == "Target Size"
 
 		if isLossless && supportsLossless {
 			// Lossless with H.265/AV1: Allow all bitrate modes
@@ -6357,24 +6360,12 @@ func buildConvertView(state *appState, src *videoSource) fyne.CanvasObject {
 				}
 				state.convert.CRF = "0"
 				crfEntry.Disable()
-				crfContainer.Show()
-				bitrateContainer.Hide()
-				targetSizeContainer.Hide()
 				hint = "Lossless mode with CRF 0. Perfect quality preservation for H.265/AV1."
 			case "CBR":
-				crfContainer.Hide()
-				bitrateContainer.Show()
-				targetSizeContainer.Hide()
 				hint = "Lossless quality with constant bitrate. May achieve smaller file size than pure lossless CRF."
 			case "VBR":
-				crfContainer.Hide()
-				bitrateContainer.Show()
-				targetSizeContainer.Hide()
 				hint = "Lossless quality with variable bitrate. Efficient file size while maintaining lossless quality."
 			case "Target Size":
-				crfContainer.Hide()
-				bitrateContainer.Hide()
-				targetSizeContainer.Show()
 				hint = "Lossless quality with target size. Calculates bitrate to achieve exact file size with best possible quality."
 			}
 		} else {
@@ -6382,31 +6373,35 @@ func buildConvertView(state *appState, src *videoSource) fyne.CanvasObject {
 			switch mode {
 			case "CRF", "":
 				// Show only CRF controls
-				crfContainer.Show()
-				bitrateContainer.Hide()
-				targetSizeContainer.Hide()
 				hint = "CRF mode: Constant quality - file size varies. Lower CRF = better quality."
 			case "CBR":
 				// Show only bitrate controls
-				crfContainer.Hide()
-				bitrateContainer.Show()
-				targetSizeContainer.Hide()
 				hint = "CBR mode: Constant bitrate - predictable file size, variable quality. Use for strict size requirements or streaming."
 			case "VBR":
 				// Show only bitrate controls
-				crfContainer.Hide()
-				bitrateContainer.Show()
-				targetSizeContainer.Hide()
 				hint = "VBR mode: Variable bitrate - targets average bitrate with 2x peak cap. Efficient quality. Uses 2-pass encoding."
 			case "Target Size":
 				// Show only target size controls
-				crfContainer.Hide()
-				bitrateContainer.Hide()
-				targetSizeContainer.Show()
 				hint = "Target Size mode: Calculates bitrate to hit exact file size. Best for strict size limits."
 			}
 		}
 
+		if showCRF {
+			crfContainer.Show()
+		} else {
+			crfContainer.Hide()
+		}
+		if showBitrate {
+			bitrateContainer.Show()
+		} else {
+			bitrateContainer.Hide()
+		}
+		if showTarget {
+			targetSizeContainer.Show()
+		} else {
+			targetSizeContainer.Hide()
+		}
+
 		encodingHint.SetText(hint)
 		if buildCommandPreview != nil {
 			buildCommandPreview()