Why Is Video Compression Strictly Queued, One at a Time?
Batch-compressing several video files uses one fixed processing unit, with tasks strictly queued and only one processed at a time — a deliberate design choice, not a performance shortfall.
Compared to image compression's parallel processing
| Image compression | Video compression | |
|---|---|---|
| Tasks running at once | Up to 4 (based on CPU cores) | Fixed at 1 |
| Why | A single image is light, so running several at once is faster overall | A single video is heavy, so running several at once would slow each one down |
| Design goal | Maximize throughput | Avoid resource contention, keep it stable |
What this means in practice
Batch-compressing several videos processes them in the order added, one finishing before the next begins — the progress bar and task status make clear which one is currently running and how many are still queued. If faster overall processing of multiple videos is the goal, the only real lever is shortening each individual video's processing time (lowering resolution first, or choosing a faster compression tier), not expecting them to run in parallel.
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