View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0000360 | madVR | bug | public | 2015-11-12 09:50 | 2015-12-21 14:52 |
| Reporter | romulous | Assigned To | madshi | ||
| Priority | normal | Severity | minor | Reproducibility | always |
| Status | closed | Resolution | no change required | ||
| Summary | 0000360: Actual FPS Value Incorrect | ||||
| Description | I logged this one into the Zoom Player tracker originally, but bLight says it is a madVR issue, so here we go. When a specific option in madVR is enabled, the 'Actual FPS' value from the Playing Information dialog in Zoom Player is often wrong (just over double the correct value). The option is 'Present Several Frames in Advance' in Rendering->Windowed Mode Settings. Note there is a similar setting in Rendering->Exclusive Mode Settings. With the option enabled, Actual FPS will often be wrong. With it disabled - on the same video - Actual FPS will be correct. bLight said that Zoom Player just reports the information madVR passes it through the frame rate API. | ||||
| Tags | No tags attached. | ||||
| madVR Version | 0.89.16 | ||||
| Media Player (with version info) | Zoom Player v11.1 Beta 2 | ||||
| Splitter (with version info) | LAV 0.66.33 Nightly | ||||
| Decoder (with version info) | LAV 0.66.33 Nightly | ||||
| Decoding | Software | ||||
| Deinterlacing | auto mode | ||||
| DXVA2 Scaling Active | no | ||||
| Aero / Desktop Composition | On | ||||
| Problem occurs with mode | all modes | ||||
| GPU Manufacturer | NVidia | ||||
| GPU Model | GTX-660Ti | ||||
| GPU Driver Version | 358.91 | ||||
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I don't think this can be considered a bug. The Microsoft interface ZP uses to ask this information from madVR is "IQualProp::get_AvgFrameRate", and the description says: > The get_AvgFrameRate method retrieves the actual > average frame rate since streaming started. And the documentation of VIDEOINFOHEADER says: > if the intended rate is 60,000/1001 (NTSC TV) > and the monitor's refresh rate is 60Hz, the > intended rate and the actual rate will never > match. To retrieve the actual frame rate achieved > during playback, use the IQualProp::get_AvgFrameRate > method on the video renderer. So madVR reports the number of frames sent to Direct3D to ZP. When using "present several frames in advance", madVR sends one frame per VSync to Direct3D. The Microsoft API explicitly does *NOT* reference the "authored" or "intended" frame rate, but the actually achieved playback frame rate. |
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Alright, makes sense (to both me and bLight). Thanks. |
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If bLight wants to know the source movie framerate, he can ask the decoder's output pin for "AvgTimePerFrame". Or if bLight wants to know the frame rate after deinterlacing, he can use "IMadVRInfo::GetUlonglong("frameRate")": frameRate, ulonglong, frame rate of the video after deinterlacing (REFERENCE_TIME) There's more information available through IMadVRInfo, see "developers\mvrInterfaces.h". |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2015-11-12 09:50 | romulous | New Issue | |
| 2015-11-12 10:00 | madshi | Note Added: 0001231 | |
| 2015-11-12 11:11 | romulous | Note Added: 0001232 | |
| 2015-11-12 11:17 | madshi | Note Added: 0001233 | |
| 2015-11-12 11:17 | madshi | Note Edited: 0001233 | |
| 2015-12-21 14:52 | madshi | Status | new => closed |
| 2015-12-21 14:52 | madshi | Assigned To | => madshi |
| 2015-12-21 14:52 | madshi | Resolution | open => no change required |
