Wanted to share a small app I built using Radzen Blazor components — an MP3 to MP4 converter, in case it's useful to anyone here or you want to see Radzen components used in a real end-to-end workflow.
What it does: upload an MP3, get back an MP4 video with an animated waveform synced to the audio — with an optional cover image composited behind the waveform.
Stack:
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C# / .NET 10
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Blazor Server (interactive server-side rendering)
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Radzen Blazor components:
RadzenUpload,RadzenDropDown,RadzenProgressBar,RadzenProgressBarCircular,RadzenCard,RadzenAlert,RadzenButton -
ffmpeg, invoked from a backend C# service viaProcess
Where Radzen fit in:
RadzenUpload handles posting the MP3 and cover image to backend endpoints with built-in progress events (Progress, Complete, Error), which made it easy to wire up a real upload progress bar without writing custom JS. RadzenDropDown drives the waveform style picker, and RadzenCard/RadzenAlert/RadzenProgressBarCircular handle the layout and status feedback around the conversion step. It made the UI side genuinely fast to put together — most of the actual engineering time went into the ffmpeg filter graph, not the UI.
How it flows:
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RadzenUploadposts the MP3 (and optional cover image) to a controller endpoint -
A
VideoConversionServicebuilds an ffmpeg filter graph — full-frame waveform if no cover image, or a waveform strip overlaid on a scaled/cropped cover image if one's provided -
ffmpeg renders the video and muxes in the original audio
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The finished MP4 previews inline with a download button
MIT licensed — repo is here if you want to look through the code or fork it:
https://github.com/benjaminsqlserver/Mp3ToMp4Converter
Happy to answer questions on the Radzen side or the ffmpeg integration if anyone's curious.