![freac ogg quality settings freac ogg quality settings](https://itselectable.com/wp-content/uploads/2021/01/anyconv-mp3-to-ogg.png)
If you keep the same nominal bitrate, you get about the same size files, which sound somewhat better.” The former behavior is the aim of the quality metric, so encoding to a target bitrate is now officially deprecated for all uses except streaming over bandwidth-critical connections.įor now, quality 0 is roughly equivalent to 64kbps average, 5 is roughly 160kbps, and 10 gives about 400kbps.
Freac ogg quality settings upgrade#
As Segher Boessenkool explained, “if you upgrade to a new vorbis encoder, and you keep the same quality setting, you will get smaller files which sound the same. This new scale of measurement is not tied to a quantifiable characteristic of the stream, like bitrate, so it's a fairly subjective metric, but provides a more stable basis of comparison to other codecs and is relatively future-proof. This change in terminology was brought about by a tuning of the variable-bitrate algorithm that produces better sound quality for a given average bitrate, but which does not adhere as strictly to that average as a target. The allowed values span from 10 (highest CPU usage and quality) down to 0 (lowest CPU usage and quality).Vorbis' audio quality is not best measured in kilobits per second, but on a scale from -1 to 10 called "quality". If the CPU usage is too high for the system you are using Opus on, you can try a lower complexity setting.
![freac ogg quality settings freac ogg quality settings](https://www.freeease.net/pic_howto/ha_audioconverter0501.png)
This means that it does not hesitate to use CPU to give you the best quality encoding at a given bitrate. The Opus encoder uses its maximum algorithmic complexity setting of 10 by default. Unless operating at very low bitrates over RTP, there is no reason to use frame sizes above 20 ms, as those will have slightly lower quality for music encoding.įor these reasons, the default 20 ms frames are a good choice for most applications. However, it increases latency and sensitivity to packet losses, as losing one packet constitutes a loss of a bigger chunk of audio. Opus uses a 20 ms frame size by default, as it gives a decent mix of low latency and good quality.įor real-time applications, sending fewer packets per second reduces the overall bitrate, since it reduces the overhead from IP, UDP, and RTP headers. It can also combine multiple frames into packets of up to 120 ms. The HydrogenAudio wiki also has some great information on Opus and its usage. The details of Opus' bandpass thresholds can be found in the opus_encoder.c source file. This could be useful if your audio has already been bandpassed, or should go through a bandpass filter (e.g. The following table shows rough bitrates that you might want to use to encode audio that has limited frequency bandwidths. downmix-stereo - downmixes all input channels to stereo (if there are more than 2 input channels, e.g. downmix-mono - downmixes all input channels to mono You can force downmixing at any bitrate by using the following command-line parameters: You can check the details in the opus_encoder.c source file. Opus tends to start downmixing stereo inputs to mono from roughly 19 Kb/s and lower. If you are archiving audio, use a lossless audio format to prevent generation loss.įor the more technical Opus users, here are some details to help you fine-tune your decision on which bitrate best fits your needs. Opus at 128 KB/s (VBR) is pretty much transparent.įor surround sound, Opus uses surround-sound bitrate allocation. (listening test results: 64 Kb/s, 96 Kb/s) Opus has better quality than MP3, AAC and Vorbis at these rates. More details in the relevant table further down this page.īitrates from here on up tend to deliver fullband audio. Opus only supports bitrates down to 6 Kb/s.Ĭodec 2 handles ultra low bitrate speech at 0.7 - 3.2 Kb/s.ġ0 Kb/s will deliver narrowband most of the time, 24 Kb/s should give fullband. tweaking the bitrate up if you think the quality is bad, and you can afford having bigger files (or a larger streaming bitrate).tweaking the bitrate down if you think the quality is good, but the file size (or bitrate) is too big,.You should test the suggested bitrate by actually listening to your encoded audio and then:
![freac ogg quality settings freac ogg quality settings](https://images.wondershare.com/images/mp4/mp4-ogg4.png)
The settings in the table below are meant to start you off with a decent tradeoff between good quality and small file size (or bitrate usage, if you're streaming). 2.4 Trading Coding Efficiency with CPU Timeĭepending on the kind of audio you want to encode with Opus, you may want to use different bitrate (quality) settings.