| Summary: | Writing speed display in Burn Progress dialog inaccurate and confusing | ||
|---|---|---|---|
| Product: | [Applications] k3b | Reporter: | Stuart Balfour <sbalfour> |
| Component: | GUI/Usability | Assignee: | k3b developers <k3b> |
| Status: | ASSIGNED --- | ||
| Severity: | minor | CC: | michalm, przemekkulczycki+kde, trueg |
| Priority: | NOR | ||
| Version: | 1.92.0 | ||
| Target Milestone: | 2.1 | ||
| Platform: | Debian unstable | ||
| OS: | Linux | ||
| Latest Commit: | Version Fixed In: | ||
| Sentry Crash Report: | |||
Hi, your comments are reasonable. Are you interested in writing a patch? I think it's a good starting point into K3b development :) I have a clear idea of what's needed, so I'm best suited to fix this. You may assign the bug to me. It's a UI issue, and not mission critical to 2.0, so it'll be deferred to 2.1. I'm assigning it to you then. This bug is still present in k3b 2.0.2 (in Ubuntu). It looks like K3B is showing DVD-sized speed in the scrolling display and Bluray-sized speed (correct) at the bottom of the burning window. Thank you for the bug report. As this report hasn't seen any changes in 5 years or more, we ask if you can please confirm that the issue still persists. If this bug is no longer persisting or relevant please change the status to resolved. |
Version: 1.92.0 (using KDE 4.4.4) OS: Linux During a recent Blu-ray burn, I saw the following displayed in the Burn Progress dialog: (in the scrolling display) Writing Speed: 8,448KB/s (6.10x) (below): 22,119MiB 81min. Estimated writing speed = 4496KB/s (1.00x) I have several issues: 1. 6.10x in the scrolling display is an incorrectly computed multiplier - it should be 8448/4496 = 1.88x 2. The multipliers both above and below don't actually have 3 significant digits of precision as implied by the trailing zero in the hundredths position. It's always a zero in the hundredths position. Either output three significant digits or format the output as two significant digits, i.e. (6.1x). 3. Since the lower speed display says "Estimated writing speed", that presumably means that the upper display which says "Writing speed" is the real or actual writing speed. Neither assumption is correct. The speed in the upper scrolling window display is the initially calibrated speed, when the drive writes a hidden test area of the media. The lower display is real time, an interval sampling computation, somewhat like the instantaneous MPG displayed on an automobile odometer. I think the scrolling window should say "Initial calibrated writing speed" and the lower display should say "Sampled writing speed". 4. How usable and meaningful is units KB/s?? when dealing with (usually) hundreds of MB or even GBs? Mental gymnastics are necessary to get an answer to the question "How many minutes (hours) will it take to burn this 4.7GB or 25GB media?" Instead of 4496KB/s how much easier would it be to answer that question if the display said 270MB/min? Nobody writes transmission speeds in baud anymore - it's Gbit/s now. We need to scale up. 5. Whatever the units we use for reporting speed, I doubt that 4 significant digits of precision represent 4 measurable and repeatable digits of accuracy. We probably have two digits of accuracy, no more. Trim the display to 2 digits rounded, i.e. instead of 4496KB/s, show 4500KB/s (and 4.5MB/s or 270MB/min would be better, as per #4 above). Reproducible: Always