Audio Limiting as well as Compression

[arnold234]

Describe the change or feature you'd like to see added to HandBrake:

A clear and concise description of what you want to happen.
Although HandBrake can compress AC3 codec audio, it would be better if there were an option to additionally limit the audio as well; for those who are not conversant of the difference, an audio limiter limits the maximum level an audio signal can reach, whereas an audio compressor will both limit maximum audio level and also boost low level audio (set by the compression ratio).

Why would this be useful? Because on high-dynamic range audio, if you attempt to set a high audio compression ratio in HandBrake, you get a issue called 'pumping', where low level audio gets lifted up & down, sounding very poor. The addition of a limiter would mean you could set a lower compression ratio, then add some audio limiting as well.

What version of HandBrake are you currently using? (e.g., 1.0.0)

All including current.

What operating system and version are you running? (e.g., Ubuntu 16.04 LTS, macOS 10.3 High Sierra, Windows 10 Creators Update)

Mac OS X 10.12.6

[alissa914]

I want you to fix the audio problems in 1.2 that cause random errors in the audio stream to where it sounds like a screech or very audible artifacts. I reverted back to 1.12 and encoded the Bluray with LDPCM audio to AAC 160kbps and it didn't do it there. Before trying to add features, how about we fix this problem first?

I assume this is related to the new nVidia CUDA encoding options or libavcodec or whatever someone said was changed between 1.12 and 1.2

As long as 1.12 keeps working, I'll just stop updating this software since no one can hear this same very audible issue but me apparently.

[jstebbins]

First, don't be snarky. The attitude is not appreciated. I certainly have no motivation to help anyone who abuses me or those I associate with.

Second, marking something as an enhancement does not mean that anyone is working on it. It means that we believe the request is in the scope of the project and a contribution of the feature would be accepted.

Finally, if you want something fixed, you may have to help. We can't do everything ourselves. We need help from the community. Some things can't be fixed without a way to reproduce them. We don't have a sample that reproduces your audio problem so can do nothing about it. When you or someone else can provide a sample, your problem will be looked into.

[alissa914]

They want me to provide clips of my Blu-ray which I cannot legally do. Fair use does not apply to such a thing. I told them what I used to encode it and the fact I used the nVidia Cuda option. Video was fine and audio is filled with errors but not on 1.12.

Then don't fix it. Someone else will run into the problem and then maybe you will. I can't distribute copywritten material to prove there are errors.

[bradleysepos]

@alissa914 I'm not sure whether you posted somewhere else, but at least here you haven't provided an activity log to help us diagnose your problem. And you've hijacked someone else's issue, which is Not Cool™.

HandBrake is free software produced by a small team of volunteers. While we're doing our best to make HandBrake bug free, we cannot and will not respond to arrogant demands. Please read our Code of Conduct.

To be clear, nobody is advocating sharing samples you cannot or do not want to. While many Blu-rays are commercial, anyone can make a Blu-ray video disc, so we don't assume what you're working with.

If you would like further assistance, please create your own separate issue (if you haven't already) for the problem you're experiencing. Please provide the information requested in the posting template, including the Activity Log. You can read more about why a log is necessary here: https://handbrake.fr/docs/en/1.2.0/help/activity-log.html