Can't get bitrate over 10 Mbit/s, please help!

Here's my question: exporting your video bitrate to the depends on the machine you use to export it. And this bitrate may vary depending on the performance of your machine (if it worked for a while, etc.) I explain the full situation below, but it is my main question.

I'm working on a video of a customer who has a second 30 and 60 second version. They submit you for a program that requires the video to have a throughput of at least 10 Mbps. When I export the 30 second version, we get about 10 400 kbit/s that works very well (the target bit rate is set at 11 Mbps). However, the 60-second version of the video (which is exact same video files like the 30 seconds, just longer), ends at a rate of 9 100 at the end of exporters (with a flow target 11).

Here are all my export settings:

Adobe first Pro 6 (not CC)

H.264 format.

1920 x 1080 demensions

30 frames per second, progressive

VBR 2 pass

Target bitrate: 11 Mbps

Maximum flow: 11 Mbps (although I tried 15 and he always ended up about 9100 Kbps)

The audio is ACC, 430 Kbps, 48 kHz, stereo.

Video files real, we are all created in AfterEffects, so I don't think that the problem of bitrate is on their part. Especially because it's the same files as the second version 30.

Almost looks like my computer can't handle that high of a bitrate for the rendering of 60 second so it goes down it. Is it possible? I use an ASUS ROG with a core i5 laptop and a Geforce GTX 660 M graphics card.

If anyone has any idea how I can get this 60 second video until at least 10 Mbps, that be great. I know the real quality between 9 Mbps and 10 Mbps per second important not that much, but the program literally won't let me download unless 10 Mbps.

Oh, quick update. I just tried to another 30 seconds video identical to that made to 10 Mbps before. This time, it reached only 7 Mbps. Is - it maybe my computer just needs to cool off?

I thank very you much for any help.

Hi Curtis,.

You do not get your flow desired is because you export a VBR (variable bit rate) file. You are him giving a target of 11 Mbps bit rate, but you're saying the encoder to choose how to compress the images based on what analysis it is necessary. So a few things to note here:

(1) 2-pass VBR means that your encoding will take twice as long as a VBR 1 pass. This is because the first pass is not encode anything. It analyzes the video and looking for frames that are more complex than others. This means that during the second pass encoding occurs actually, the encoder will know where to make a request for additional data / a sampling rate to executives who need it because it seemed to come already. So if you don't have a video with complex images that change or have a lot of fast moving, you should make 1 VBR passes a test, he'll cut your coding time in half.

(2) which goes back to your problem... it isn't really a problem. The encoder is to do what asked you it to do, he compressed the frames to the desired target. Compression is all about the compromise of quality and file size (and encoding time). If you want a rate on a VBR file, then you need to increase your target and max. You can have a flow target of 10 Mbps and a maximum rate of 15 Mbps and the encoder will aim for an average of 10 Mbps, but go to 15 Mbps for more complex images.

(3) another option is to spend your CBR (constant bit rate) encoding and give him a target of 10 or 11 Mbps. This means that each image will be encoded with the same amount of data. The drawback here is that your file will be larger, because your solid black frames, which require very little information to be displayed, will be exactly the same size frames with your 10,000 particles, polygons, layers or other form. The advantage of the VBR encoding is that the encoder will consider the black frames and say "hmm, this frame doesn't have a lot of things in it, so it shouldn't have as much data. But hey, this particle system has of course a lot of moving parts, I'd better throw some extra bits to him. »

And Yes, that is exactly how to talk the encoders.

Tags: Premiere

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