Step C — Concatenate or repeat to reach ~1 GB: 3. Check sizes:

Downloading a 1GB file over a spotty connection can lead to corruption. Do not assume the file is good just because it ends in .mp4 .

Use this formula: desired_seconds = 1024 / ( (video_bitrate_mbps + audio_bitrate_mbps) / 8)

: For real-world high-bitrate content, the National Film Registry hosts public domain films that include large MP4 files, such as a 1.9GB MP4 , which are useful for testing long-duration playback.

Modern testing should use :

: If you need high-quality visual content rather than just a dummy file, searching for "1GB" or "4K" on Pexels or Pixabay will provide royalty-free, high-resolution clips that often exceed several hundred megabytes or reach the 1GB mark depending on the resolution and duration chosen. Specialized Testing Resources