FFmpeg 9.1 的新版 AAC 编码器
FFmpeg 9.1's new AAC encoder

原始链接: https://hydrogenaudio.org/index.php/topic,129691.0.html

此页面确认 Apache2 服务器已在您的 Ubuntu 系统上正确安装并运行。要部署您的网站,请替换位于 `/var/www/html/index.html` 的默认文件。 **关键配置详情:** * **结构:** Ubuntu 的 Apache 配置被拆分为位于 `/etc/apache2/` 下的模块化文件,其中 `apache2.conf` 是主入口。 * **管理:** 使用提供的辅助工具(如 `a2ensite`、`a2enmod`)通过符号链接来管理虚拟主机和模块。 * **服务控制:** 服务器通过 `systemctl` 进行管理(例如 `systemctl start/stop/status apache2`)。 * **安全性:** 默认情况下,访问权限仅限于 `/var/www`、`/usr/share` 和 `public_html`。如果您的文件存储在其他位置,必须在 `apache2.conf` 中将该目录列入白名单。 如需进一步指导,请查阅位于 `/usr/share/doc/apache2/README.Debian.gz` 的文档。如果遇到问题,请使用 `ubuntu-bug` 工具进行报告,并确保区分核心服务器漏洞与 PHP 等特定模块的相关问题。

FFmpeg 9.1 发布了全新的 AAC 编码器,这在 Hacker News 上引发了热烈讨论,凸显了既定标准与更高效新技术之间的持续博弈。 尽管用户认可改进 AAC 编码的价值——尤其是在直播(RTMP/H.264)和硬件加速播放方面的普及性——但许多人认为 Opus 在技术上更胜一筹,在几乎所有码率下都优于 AAC。新 FFmpeg 编码器的支持者希望它能缩小质量差距,从而减少对苹果 Core Audio 等专有技术的依赖。 讨论还涉及了采样率的“标准化”问题,48kHz 已成为优于传统 44.1kHz 的专业首选。尽管存在技术争论,但一些参与者指出,对于大多数消费级场景而言,现代有损编解码器之间的实际差异已微乎其微。归根结底,这反映了一个经典的争论:是坚持维护向后兼容且被广泛支持的 AAC 标准,还是推动行业转向像 Opus 这样技术更先进的开源格式。
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原文

This is the default welcome page used to test the correct operation of the Apache2 server after installation on Ubuntu systems. It is based on the equivalent page on Debian, from which the Ubuntu Apache packaging is derived. If you can read this page, it means that the Apache HTTP server installed at this site is working properly. You should replace this file (located at /var/www/html/index.html) before continuing to operate your HTTP server.

If you are a normal user of this web site and don't know what this page is about, this probably means that the site is currently unavailable due to maintenance. If the problem persists, please contact the site's administrator.

Ubuntu's Apache2 default configuration is different from the upstream default configuration, and split into several files optimized for interaction with Ubuntu tools. The configuration system is fully documented in /usr/share/doc/apache2/README.Debian.gz. Refer to this for the full documentation. Documentation for the web server itself can be found by accessing the manual if the apache2-doc package was installed on this server.

The configuration layout for an Apache2 web server installation on Ubuntu systems is as follows:

/etc/apache2/
|-- apache2.conf
|       `--  ports.conf
|-- mods-enabled
|       |-- *.load
|       `-- *.conf
|-- conf-enabled
|       `-- *.conf
|-- sites-enabled
|       `-- *.conf
          
  • apache2.conf is the main configuration file. It puts the pieces together by including all remaining configuration files when starting up the web server.
  • ports.conf is always included from the main configuration file. It is used to determine the listening ports for incoming connections, and this file can be customized anytime.
  • Configuration files in the mods-enabled/, conf-enabled/ and sites-enabled/ directories contain particular configuration snippets which manage modules, global configuration fragments, or virtual host configurations, respectively.
  • They are activated by symlinking available configuration files from their respective *-available/ counterparts. These should be managed by using our helpers a2enmod, a2dismod, a2ensite, a2dissite, and a2enconf, a2disconf . See their respective man pages for detailed information.
  • The binary is called apache2 and is managed using systemd, so to start/stop the service use systemctl start apache2 and systemctl stop apache2, and use systemctl status apache2 and journalctl -u apache2 to check status. system and apache2ctl can also be used for service management if desired. Calling /usr/bin/apache2 directly will not work with the default configuration.

By default, Ubuntu does not allow access through the web browser to any file outside of those located in /var/www, public_html directories (when enabled) and /usr/share (for web applications). If your site is using a web document root located elsewhere (such as in /srv) you may need to whitelist your document root directory in /etc/apache2/apache2.conf.

The default Ubuntu document root is /var/www/html. You can make your own virtual hosts under /var/www.

Please use the ubuntu-bug tool to report bugs in the Apache2 package with Ubuntu. However, check existing bug reports before reporting a new bug.

Please report bugs specific to modules (such as PHP and others) to their respective packages, not to the web server itself.

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