Matthew Dobrski
Captain
Flight distance : 1831050 ft
Canada
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Sowa Posted at 2018-1-13 14:02
Hello again! (sorry, I will reply in English, so that other may take part as well )
So I have made another material from P4P - again in 4K (100MBit, no other option), 24 fps, D-Cinematic, -2/-2/0 custom settings (I used -2 for all in others, same bad results) and I used H265 - I was advised in other forum it should solve my problems. But it did not. Please have a look at below test clip, especially around second 20.
I'm afraid you're expecting too much from Phantom 4 Pro camera, filming such demanding objects like white water (rapids). This is a classic example of H.264/265 codec efficiency. Try to film a glass of boiling water (with submerged electric heater) and you'll see how H.264 is struggling to preserve details of such chaos. BTW H.265 codec is not really better in terms of resulted video quality, it's about drastically smaller file for Internet distribution.
Summarizing, we're talking about 3 separate issues here:
1. The quality of raw footage, determined mainly by recording bit rate and efficiency of compression codec implemented by DJI, either H.264 or H.265. This is given after the fact and there's nothing you can do about it.
2. The quality of rendering during media export from within video editor environment. Here you have a plethora of options to choose from, among them the bit rate as being the most important. More about this later.
3. The quality of Internet player (i.e. YouTube, Vimeo etc.). They'll give you some resolution options to choose for playback, but they will process your file again anyway, applying lower bit rate and therefore reducing file size. Another words, what you'll consider of acceptable quality on your 4K computer monitor may become of terrible quality on YouTube. And this is also beyond your control, unfortunately.
Now, back to pt.2. The more fast moving details (grass, foliage, falling water etc.) is in the frame, the harder codec is working to preserve them. Too much details means that visible skipping may occur, and this is exactly the case. Some areas of frames may appear mushy. Said that, Phantom 4 Pro camera performs splendidly, one must agree, taking 100 Mbps rate into consideration. The trick is to not make this worse during post production. Among other output parameters like frame size/rate and compression codec, rendering bit rate is critical. These are accessible in Export dialog, tons of YouTube tutorials explain these issues in detail. I'm using output video parameters identical to original material and Constant Bit Rate (CBR), rendering of about 25 value with good results. Some people may recommend even higher rate when dealing with H.264/265 codecs. Avoid Variable Bit Rate (VBR), in Adobe Premiere Pro set by default to between 10 and 12, as not capable to produce quality 4K output. |
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