[Advanced Paste] Add paste actions to allow transcoding of media files

[drawbyperpetual]

Summary of the Pull Request

See linked issue for more information.

PR Checklist

• Closes: [Advanced Paste] Add paste actions to allow transcoding of media files #37187
• Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• Tests: Added/updated and all pass
• Localization: All end user facing strings can be localized
• Dev docs: Added/updated
• New binaries: Added on the required places
  • JSON for signing for new binaries
  • WXS for installer for new binaries and localization folder
  • YML for CI pipeline for new test projects
  • YML for signed pipeline
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

A CancellationToken is now propagated to all leaf paste actions to allow for cancellation, as is an IProgress<double> for progress reporting.

Validation Steps Performed

• Tested new functionality
• Tested existing Advanced Paste functionality

[crutkas]

This is going to be so 🔥

[snickler]

Merged the latest main into this branch so we can see the CI kick off properly, but it LGTM! Worked perfectly with transcoding a few mp4 videos, a few AVI files, transcoding a video to mp3, converting files on my QNAP, and didn't crash when I tried to feed it something invalid. Awesome job @drawbyperpetual!

[shuaiyuanxx]

Everything else looks great! This is a fantastic PR—really appreciate your contribution. ❤️
Maybe we can consider adding support for more format conversions in the future.

[Copilot]

Copilot reviewed 24 out of 39 changed files in this pull request and generated 1 comment.

Files not reviewed (15)

• src/modules/AdvancedPaste/AdvancedPaste/AdvancedPasteXAML/Controls/AnimatedContentControl/AnimatedContentControl.xaml: Language not supported
• src/modules/AdvancedPaste/AdvancedPaste/AdvancedPasteXAML/Controls/PromptBox.xaml: Language not supported
• src/modules/AdvancedPaste/AdvancedPaste.UnitTests/Mocks/NoOpKernelQueryCacheService.cs: Evaluated as low risk
• src/modules/AdvancedPaste/AdvancedPaste/Helpers/UserSettings.cs: Evaluated as low risk
• src/modules/AdvancedPaste/AdvancedPaste.UnitTests/ServicesTests/AIServiceBatchIntegrationTests.cs: Evaluated as low risk
• src/modules/AdvancedPaste/AdvancedPaste/Helpers/TransformHelpers.cs: Evaluated as low risk
• src/modules/AdvancedPaste/AdvancedPaste/AdvancedPasteXAML/Controls/PromptBox.xaml.cs: Evaluated as low risk
• src/modules/AdvancedPaste/AdvancedPaste.UnitTests/ServicesTests/KernelServiceIntegrationTests.cs: Evaluated as low risk
• src/modules/AdvancedPaste/AdvancedPaste/Helpers/OcrHelpers.cs: Evaluated as low risk
• src/modules/AdvancedPaste/AdvancedPaste/Helpers/KernelExtensions.cs: Evaluated as low risk
• src/modules/AdvancedPaste/AdvancedPaste/AdvancedPasteXAML/MainWindow.xaml.cs: Evaluated as low risk
• src/modules/AdvancedPaste/AdvancedPaste/Models/ClipboardFormat.cs: Evaluated as low risk
• src/modules/AdvancedPaste/AdvancedPaste/Models/PasteActionError.cs: Evaluated as low risk
• src/modules/AdvancedPaste/AdvancedPaste/Models/PasteFormats.cs: Evaluated as low risk
• src/modules/AdvancedPaste/AdvancedPaste/Services/ICustomTextTransformService.cs: Evaluated as low risk

Comments suppressed due to low confidence (2)

src/modules/AdvancedPaste/AdvancedPaste/Helpers/DataPackageHelpers.cs:53

• The array passed to File.WriteAllBytesAsync is empty, which will result in an empty file being created. This may not be the intended behavior.

await File.WriteAllBytesAsync(outputFilePath, [], cancellationToken); // TranscodeAsync seems to require the output file to exist

src/modules/AdvancedPaste/AdvancedPaste/Helpers/DataPackageHelpers.cs:239

• [nitpick] The variable name extension is ambiguous. It should be renamed to fileExtension for clarity.

where extension.StartsWith('.')

[Copilot]

Replace empty array [] with a valid byte array, e.g., new byte[0].

Suggested change

	await File.WriteAllBytesAsync(outputFilePath, [], cancellationToken); // TranscodeAsync seems to require the output file to exist
	await File.WriteAllBytesAsync(outputFilePath, new byte[0], cancellationToken); // TranscodeAsync seems to require the output file to exist

[shuaiyuanxx]

LGTM

[shuaiyuanxx]

I’m wondering if there’s a better way to display an error message explaining why the media cannot be transcoded. Perhaps we should validate the media beforehand to check if it's supported. Otherwise, if the transcoding fails, the user may not understand the reason—just like in the image below.

[shuaiyuanxx]

Can we check if the media is already in the target format before starting transcoding to avoid redundant processing?