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16th January 2013, 17:38 | #16941 | Link | ||
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16th January 2013, 17:39 | #16942 | Link |
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Hardware Deinterlacers can detect the cadence if you're lucky and produce proper quality, just with duplicate frames.
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LAV Filters - open source ffmpeg based media splitter and decoders |
16th January 2013, 18:14 | #16944 | Link | ||
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What's the best way to determine if content is natively interlaced vs telecined? |
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16th January 2013, 18:23 | #16945 | Link | |
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When you can playback a full long movie without frame drops/repeats.
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There are more variations than just natively interlaced and telecined. E.g. there's content which was telecined and then overlayed with natively interlaced content. Or there's field blended film content. This is a really complicated topic. What you could do is enable madVR's film mode and then check if playback quality is good. If it is, then you very likely have a telecined film source. If you see combing then you have one of the other variants, for which at the moment you should better use DXVA deinterlacing. |
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16th January 2013, 18:32 | #16946 | Link | |
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yes NumPad 1 does make the problem go away Last edited by truexfan81; 16th January 2013 at 18:34. |
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16th January 2013, 18:36 | #16947 | Link |
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Then it seems to be a problem with the relatively new fixed zoom factor resamplers. Which movie resolution and target rectangle does the madVR OSD (Ctrl+J) show when the problem occurs? Are you totally sure you're really using v0.85.7? I'm asking because there was a problem with some older builds. So if you're still using an older build that may eventually explain the problem.
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16th January 2013, 18:42 | #16948 | Link |
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Surely that's the problem. Even 23.977 vs 23.976 (far more accurate than most GPUs out of the box) results in a drop every 17mins. To guarantee no drops in a movie you would need almost 10 times that accuracy, which is pretty hard even with custom timings. I know because I tried really hard about 5-6 years ago. I'd say it is close to impossible for most people! Now it's true most people, in most movies, might not notice one or two frames drops depending on when they happen (especially because of all the good work you have done in MadVR to eliminate repeated judder when a frame needs to be dropped), but if that is your standard something like Reclock (or Videoclock in JRiver MC) is just about essential.
Last edited by Jong; 16th January 2013 at 18:45. |
16th January 2013, 18:42 | #16949 | Link | |
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So what is the alternative here, implementing DXVA IVTC? Isn't madVR's own IVTC the best way to go (for quality) anyway? |
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16th January 2013, 18:47 | #16950 | Link | |
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target rectangle 0, 0, 1920, 1080 and madVR reports v0.85.7 tomorrow i can post a sample vid if needed Last edited by truexfan81; 16th January 2013 at 19:06. |
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16th January 2013, 19:06 | #16951 | Link | |||
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Everything is "at the moment". madVR has not reached v1.0 yet. Can I have a small sample, please? I don't think I have a video in this exact resolution. |
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16th January 2013, 19:14 | #16952 | Link | |
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16th January 2013, 19:38 | #16953 | Link | |
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16th January 2013, 20:01 | #16955 | Link |
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Matching the display rate reported by madVR OSD, to the rate output by SVP. Is this what should be matched exactly?
EDIT: Yes I see your post, very interesting indeed, thanks very much. Seems slight adjustments are needed. Thank you. EDIT2: Is there any way that you can think of, of figuring out from the audio clock deviation and display rate, a playback rate that should produce no drops? Or is it always a matter of trial and error to find a value that doesn't produce drops / repeats. I'm just concerned how long it might take to get a good calibration (although I personally don't mind putting in that effort to get 0 drops , 0 repeats ). Last edited by mark0077; 16th January 2013 at 20:24. |
16th January 2013, 20:24 | #16957 | Link | |
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Sorry I was just wondering what the alternative was to madVR's own IVTC. I figured it wouldn't be as good as madVR's implementation. |
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16th January 2013, 21:02 | #16958 | Link |
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Hello guys,
I have to change my old graphic card, a HD6850, and i would like to know if there is a card or a brand better than an other... Do you think that it is possible to see an improvement and have a better picture quality with the last generation ??? I know that Nvidia has CUDA but it doesn't give a better picture, it only helps to decode more quickly... |
16th January 2013, 21:04 | #16959 | Link |
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This is exactly what I did around 2007 when I had to bitstream my audio - Leaving whole movies to run, noting if there were any skips (at one stage I had to do this by eye! At least MadVR has a reliable OSD you can just leave running ) it was a labour of love, but I was never sure it would be consistently accurate. Due to my incompetence, the limitation of the tools of the time or maybe natural variability (not sure, see post above) I was constantly recalibrating. Trying to get accuracy to 1/240,000 (ish) is not easy
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16th January 2013, 21:04 | #16960 | Link | ||||
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When using native DXVA decoding, there is no good alternative. I might eventually move madVR's IVTC algorithm to the GPU sooner or later, then it will also work together with native DXVA decoding. But that's future talk... |
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Tags |
direct compute, dithering, error diffusion, madvr, ngu, nnedi3, quality, renderer, scaling, uhd upscaling, upsampling |
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