Several-second delay rendering video and waveform in audio_manual for large video files loaded from URLs

Hi Prodigy team,

I'm using the audio_manual interface to annotate video files larger than 100MiB. When a task loads, there is a consistent delay of several seconds before the video player and audio waveform appear in the UI.

Setup:

  • Prodigy version: v1.18.8
  • Interface: audio_manual
  • Video files: >100MiB
  • Media is loaded from URLs (not base64-embedded)

Observed behavior:

  • After the task loads, the UI shows nothing (no video, no waveform) for several seconds.
  • After that delay, both the video and waveform appear.

Questions:

  • Is this delay expected behavior for large video files in audio_manual?
  • Is there a supported way to reduce the time to first render?
  • Is there a recommended pattern for annotating large video files with this interface (e.g., chunking, media fragments, or a different interface)?

I'd appreciate any guidance on whether this is a known limitation or something that can be addressed through configuration or a custom recipe.

Thanks!