XHA1 HDV 24p to H.264: Best bitrate?
Hi,
Here is the info from one of my clips: Quote:
For example, should my target bitrate be 3.2 (to match the Average Data Rate of the source footage)... and what should be my maximum? AME will let me go up to 24mbs, but is that extreme and/or superfluous? Any tips for a noob to H.264? Also, what is the best keyframe distance? I would love some help! :) Have a great night! Cheers, Micky Thanks a billion in advance! |
Maybe it's because I haven't had enough coffee yet, but I cannot figure out what you are trying to do.
Picking the correct codec and settings depends upon your delivery media. Are you going to BD, a kiosk playback, or the Web? Without knowing where you are going, it's hard to give you salient advice. Give us your use and delivery case information and we'll try to help you out. |
Hi Tripp! Thanks for the reply, I really appreciate it.
Sorry that I did not provide enough info. I am eventually going to web. The streaming web service that my company uses allows for "HD" playback, and they suggest users upload H.264. This service creates several encoded versions of the uploaded video... The highest resolution version being 1.5mbps. The uploaded source version is not included in the allowed versions for playback. I was told that knowing the original encoding rate of my source material is useful for determining the target variable bit rate that I am exporting. Basically, I want to make sure that the uploaded version has the optimal settings for down sampling on their end. I have output some vids at 5mbps/7mbps VBR and it looks pretty good (when viewed locally and when viewing the 1.5mbps version on their end). I have never really used H.264 before, and thought I would ask for some help here. :) Questions:
Please let me know if you need more info... Sorry if I sound like a complete noob. Thanks Tripp! Have a great day! Cheers, Micky |
Google "bit rate calculator" to help with optimal bit rates, etc.
Also, a source's data rate (3.2 MBytes in your case) is not the same as an encoders bit rate (3.2 mbps would be megaBITS per sec, not megabytes). |
Hi Bill!
Thanks for the help! I really appreciate it. :) I am googling now. Also, thanks for the clarification on the data rate. If ya'll don not mind, I may be back with more questions. :D Have a great day! Cheers, Micky |
This seems to answer my question about keyframes:
Quote:
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These settings worked pretty well for me.
Here is the preset. Here is sample footage. Brightcove will create "renditions" based on the uploaded mp4. The highest one being 1.5mbps. My company has an account that does not stream, only progressive downloads, so I have just been uploading one "rendition"/version with a 1 - 1.5mbps CBR (with all the same settings as settings above)... Seems to work pretty well for my needs. Not sure if that will help anyone. Cheers, Micky |
I've been going as low as 0.8 Mb/s for HD 720 on the web. The logic being that the file sizes are much smaller and viewers don't need a fast internet connection. The down side is that viewers' pc's need to be reasonably modern for the cpu to be able to decode the file in real-time.
Here's an example of 0.8 MB/s: Nick Pynn at the Brighton Fringe Launch Party Festival Previews Video Blog It's 190 seconds long and is just over 20 MBytes in size. Ian Festival Video and Audio Previews - Festival Previews Ltd |
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