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30th June 2023, 13:35 | #11 |
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2160p and 3.25 GB is already fairly small, unless it's rather short. I've seen that recently, some studios started to get stingy on the 2160p releases, in terms of bitrate, but rather generous on the 1080p version.
So, for a start, you could check if there's a 1080p version available. If it is, it might or might not already meet your requirement. But it might also be a better starting point to create your own, smaller version. As a rule of thumb, 1080p videos are usually in the range of 5 to 12 Mbit/s and 2160p are between 15 and 35 Mbit/s. This is for H.264 / AVC encoded videos, which most of them are. In terms of encoding settings, H.265 / HEVC is your friend. With HEVC, the bitrate can be much lower for the same quality. You can go for constant quality, a value of 18 to 20 should make the video nearly indistinguishable from the original. But it will most likely not reach your requirement of 1 GB file size. A setting between 22 and 25 will most likely get you there, 25 could already give you a file that's substantially smaller than 1 GiB while still providing good quality. You could also go for average quality settings. With that setting, you can calculate it in a way so that you get a file that's almost exactly 1 GB and this will then get you the best possible quality for your chosen file size. The above constant quality settings of 18 to 25 will likely result in bitrates in the range of 3 to 2 Mbit/s (higher numbers = less bitrate / smaller file / less quality). To calculate it exactly, you need to know the run time of the video. Let's assume it's 30 minutes or 1800 seconds. Since you're aiming for 1 GB, this gives you 1024 MB / 1800 seconds ~ 0.568 MB/s ~ 4.55 Mbit/s. So, if you would enter 4550 kbit/s in Handbrake for a 30 min file, it will give you a file that's almost exactly 1 GB. Some of the numbers are just educated guesses, encoding results may vary for each individual video, based on its properties. |
30th June 2023, 17:27 | #12 |
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A few settings I use are this.
I open Handbrake and go to, Tools, Preferences and untick check for updates, then click on Output Files, and I use My Desktop as the Default Path and then select the File Extension you want to use. Then click Back which is located at the top left. Now on the Video Tab I use 19.5 as an encoding quality and I get a very good size to quality ratio. |
5th July 2023, 10:21 | #13 |
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When converting vids with Handbrake, consider reducing the audio bitrate unless you are an audio freak. IMHO audio bitrates these days are higher than necessary & make files larger.
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5th July 2023, 23:01 | #14 | |
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Quote:
Unless we're talking about a very low quality SD video, the audio is almost irrelevant for the total file size. Reducing the audio bitrate from 256 kbit/s to 128 kbit/s will save 28.8 MB on a 30 minute video. If every MB counts, sure, you're 28 MB closer to your target size. But overall, it's not really helping you if you're looking at the 3 GB video stream in comparison. |
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17th July 2023, 00:42 | #15 | |
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Quote:
Code:
ffmpeg -i source.mp4 -aspect 16:9 -vf scale=1920x1080 destination.mp4 |
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