VBR Bit Rate

[Anakin]

Hey guys

I know everyone has a different answer and opinion, but if you were encoding a H264 file for Blu Ray burning, 1920x1080, what bit rate on average do you aim for? Is 7000 too low? Is 15000 too high?

I know every video is different, but just trying to get some opinions from you fine people.

Thanks

Ani

[davexnet]

Any reason not to use constant quality instead? Then the encoder uses the amount of bitrate it needs
regardless of the videos complexity

If it's not imperative to hit a specific bitrate ( to fit on a DVD for example) no real need to use 2-pass vbr

[Cornucopia]

There are still other constraints on the file (vbv/hrd) that must be adhered to. While the limits are higher on bluray compared to dvd, there still are limits. It is possible a crf file would be acceptable, but one should have a rigorous verification step in one's workflow to avoid creating out-of-spec discs, or even to avoid getting caught by a later check by the authoring software which would require a re-encoding.

Scott

[Anakin]

Can we please just answer the question I asked?

[manono]

Can we please just answer the question I asked?

It was already answered. The question you asked can't be answered with a bitrate figure as different kinds of content require different bitrates for the same quality. The correct answer already given is to use CRF encoding for the quality you want.

[Anakin]

Can we please just answer the question I asked?

It was already answered. The question you asked can't be answered with a bitrate figure as different kinds of content require different bitrates for the same quality. The correct answer already given is to use CRF encoding for the quality you want.

CRF is no good for Blu Ray is what I was told on this very forum.

[davexnet]

Can we please just answer the question I asked?

It was already answered. The question you asked can't be answered with a bitrate figure as different kinds of content require different bitrates for the same quality. The correct answer already given is to use CRF encoding for the quality you want.

CRF is no good for Blu Ray is what I was told on this very forum.

Seems it can be used if you included some additional control, see here:
https://forum.videohelp.com/threads/365667-FFmpeg-best-settings-to-encode-Blu-Ray#post2332049

I would think (although I've never authored a blu-ray in my lfe), you should try and maximise the disk space as much as you can
while remaining within the blu-ray spec limits.

[Anakin]

Can we please just answer the question I asked?

It was already answered. The question you asked can't be answered with a bitrate figure as different kinds of content require different bitrates for the same quality. The correct answer already given is to use CRF encoding for the quality you want.

CRF is no good for Blu Ray is what I was told on this very forum.

Seems it can be used if you included some additional control, see here:
https://forum.videohelp.com/threads/365667-FFmpeg-best-settings-to-encode-Blu-Ray#post2332049

I would think (although I've never authored a blu-ray in my lfe), you should try and maximise the disk space as much as you can
while remaining within the blu-ray spec limits.

But again, that’s not what I asked! It’s like if I asked what type of car should I get and someone says motorbike. I just want to know what bit rate to use. I’m not talking about any other setting.

[Cornucopia]

He did say maximize your bitrate while staying within the limits and parameters of the spec. Once you know the spec (available from many places, including here above - see "What Is..."), this is determined by your cumulative runtime and the capaity of the disc. You can do less, but you are just reducing quality. By how much depends often on the nature of the content. But you are wrong thinking bitrate is the ONLY thing to concern yourself with.

Scott

[Anakin]

He did say maximize your bitrate while staying within the limits and parameters of the spec. Once you know the spec (available from many places, including here above - see "What Is..."), this is determined by your cumulative runtime and the capaity of the disc. You can do less, but you are just reducing quality. By how much depends often on the nature of the content. But you are wrong thinking bitrate is the ONLY thing to concern yourself with.

Scott

Sigh. I’m not asking about any other setting. Just asking people who use VBR for 1080 video what average bit rate they use.

[poisondeathray]

There is no exact number or guideline.

1) People use a bit rate calculator to fit the disk . You have a fixed capacity.

2) Different types of content require different amounts of bitrate to achieve a certain "level of quality". e.g smooth cartoons will require much less bitrate than say, a grainy action movie

[_Al_]

How about length? There is lot of videographers here, lengths can differ and content simply fits using CRF value and --vbv-bufsize 30000 --vbv-maxrate 30000
Also type of content? Camcorder video, upscaled SD VHS, cartoon, movies? Even that would not help much but at least you'd get some answers (that you want to hear), if fancying this 2pass average betting game.

Do you know your ballpark length where your good enough CRF and buffers for your type of video would be not enough for BD capacity?
Bitrateviewer results might help you further to see where those values shoot at.
Mind you, those ballpark lengths you will never reason, if sticking to different CRF values using 2pass average gamble and totally different videos. You are blindfolded every time. You think you have an answer but at the end you undershoot or most likely overshoot most of the time. If you do not care about that. Just as poisondeathray says, you have capacity and length so just get average.

Guessing 2pass average is pure gamble, there is absolutely nothing scientific about it or good for a comparison. It is good only for fitting a medium.

[Alwyn]

My Bluray authoring software is telling me that, for a soap-opera type HD (1080i) video of 1hr 54min, a bit rate (that's VBR) of 25,000kbps for H264 video (that includes AC-3 at 384kbps) will just fill the disk with nothing to spare.

I don't know what the maximum allowed bitrate for BD is, although my software won't allow more than 40,000kbps.

[jagabo]

My Bluray authoring software is telling me that, for a soap-opera type HD (1080i) video of 1hr 54min, a bit rate (that's VBR) of 25,000kbps for H264 video (that includes AC-3 at 384kbps) will just fill the disk with nothing to spare.

It doesn't have to be soap-opera type video. No matter what the other properties of the video the bitrate/runtime numbers are the same. The issue is what quality that video will have.

I don't know what the maximum allowed bitrate for BD is, although my software won't allow more than 40,000kbps.

That's the max for a single any video stream on BD. You can see other limits here: https://www.videohelp.com/hd#tech

As poisondeathray said, different videos require different bitrates. So the OP's question can't be answered with a single number.

[lordsmurf]

So the OP's question can't be answered with a single number.

42

[Alwyn]

It doesn't have to be soap-opera type video. No matter what the other properties of the video the bitrate/runtime numbers are the same.

Fair enough, point taken.

As poisondeathray said, different videos require different bitrates. So the OP's question can't be answered with a single number.

Of course it can. Fill the disk at 40,000kbps, and if that's too big (size-wise) for the disk drop the bitrate until it will fill. 1h54m = 25000kbps (approx).

[Cornucopia]

So the OP's question can't be answered with a single number.

42

Good one!

[lollo]

So the OP's question can't be answered with a single number.

42

Good one!

41 (mine is better!)

[Anakin]

Don’t worry about it. Asked on another forum and they actually answered the question that was asked.

[jagabo]

Don’t worry about it. Asked on another forum and they actually answered the question that was asked.

The answer was wrong.

[lollo]

Don’t worry about it. Asked on another forum and they actually answered the question that was asked.

Fisrt mistake: ask that question again

Second mistake: rely on the answer

[Anakin]

Don’t worry about it. Asked on another forum and they actually answered the question that was asked.

The answer was wrong.

Every reply you do on this forum is usually wrong.

[Cornucopia]

Sigh

[Anakin]

Sigh

Agreed.

[Anakin]

I just joined a superhero forum. I asked them who their favourite Marvel hero was. The replies were “have you watched Batman” and “you should watch Superman”. Crazy, right!?

[lollo]

A guy just joined a forum: he says 2+2=5. The forum replies: 2+2=4. Then he will ask elsewhere: why 2+2 does not give 5?, and complains that the forum does not give rigth answer. Crazy, right!?

[jagabo]

Here's an answer for you: anywhere from 20 to 40000 kbps.

[4kblurayguru]

Hey guys


I know every video is different

Yes but you provided no information about the content
is it 50fps or 25fps?
is it anime, sports or "movie"?
is interlace or progressive?
why AVC codec? is there anything wrong with MPEG2?
what about audio? is it dolby digital, PCM or DTS HDMA?
is it single layer or double layer disc?
any other video? trailers? BTS?
menu, simple or enhanced?

if video is 135minutes or less, there's nothing wrong with MPEG2

[Anakin]

Here's an answer for you: anywhere from 20 to 40000 kbps.

You are the reason a lot of people leave this forum.

[lollo]

Every reply you do on this forum is usually wrong.

You are the reason a lot of people leave this forum.

Now you stop this. Jagabo is one of the most knowledgeable users here, and you should learn from him rather than acting like a troll who knows nothing.