The following is a list of answers to questions regarding the use of the exhale application or library which are often being asked. If there is a question you do not find an answer to, please notify one of the developers or ask the question in, e.g., the [HydrogenAudio](https://www.hydrogenaud.io) forum.
The following is a list of answers to questions regarding the use of the exhale application or library which are often being asked. If there is a question you do not find an answer to, please notify one of the developers or ask the question in, e.g., the [HydrogenAudio](https://www.hydrogenaud.io) forum.
Can the exhale application write or copy metadata to an encoded file?
If, by metadata, you mean iTunes-style artist/song/cover metadata: no, and there currently is no plan to add support for this. See [this question](https://gitlab.com/ecodis/exhale/-/wikis/faq#i-get-corrupted-files-when-encoding-using-exhale-via-foobar2000-why) for a work-around. If you are talking about ReplayGain-style peak/loudness metadata: yes, this can be handled by the dynamic range control (DRC) metadata according to ISO/IEC 23003-4, which will be supported in a future version of this software. See also the exhale release notes in the `include` subdirectory.
How does the bit-rate mode of the exhale application or library work?
How does the bit-rate mode of the exhale application or library work?
No, not from the command-line application, you would have to modify the source code and recompile exhale. Note, however, that exhale was carefully designed to provide good quality for a variety of input signals and for many people with different levels of hearing acuity. Moreover, there is an input audio bandwidth detector and a psychoacoustic model in the code which optimizes the coding bandwidth based on each audio frame. Therefore, in order not to jeopardize exhale's audio quality, it is **not** recommended to make any changes.
No, not from the command-line application, you would have to modify the source code and recompile exhale. Note, however, that exhale was carefully designed to provide good quality for a variety of input signals and for many people with different levels of hearing acuity. Moreover, there is an input audio bandwidth detector and a psychoacoustic model in the code which optimizes the coding bandwidth based on each audio frame. Therefore, in order not to jeopardize exhale's audio quality, it is **not** recommended to make any such changes.