2020年3月18日
By 1月时特约编辑
专题文章

买家必备视频工具指南

You can't effectively perform as a compressionist without tools that reveal critical details about your encoded files, 无论是基本的编解码器, 决议, and data rate or are deep-level elements like group-of-pictures (GOP) structure and quality levels. This guide identifies the functions you need as well as the tools that can supply them, 它们花了多少钱?, 去哪里? 让他们.

本指南是全面的，但不是详尽的. 如果你想了解你应该为自己购买的工具, 请以此为起点. 如果你销售的工具，你认为我们应该考虑，但没有, 请在下面的评论中告诉我们.

免费工具

如果一个工具是免费的并且服务于一个有用的目的, 没有理由不在每台支持它的计算机上安装它. 这个类别中有两个:MediaInfo和比特率查看器.

MEDIAINFO

Mediainfo

什么: 一种文件分析工具，用于识别密钥编码配置细节如 audio/video codec, profile, 位rate, 决议, 帧率, audio channels, and sampling rate. 该工具是免费的适用于Windows, Mac, Ubuntu, iOS, Android，以及许多其他操作系统.

地点: 位.ly / SM_MI

多少: 免费的; donations accepted

有趣的事实: 安装后，您可以悬停
你的指针在任何文件在Windows百家乐软件管理器和查看基本的音频/视频
编解码器和编码信息.

看看它是如何运作的: 位.ly / SM_MI_BV YouTube(视频)

结论: 此工具应安装在你办公室和家里的每一台电脑.

比特率查看器

什么: A Windows-only tool that shows the per-frame or per-GOP size and average data rate for MPEG-2 and H.264编码文件(但不适用HEVC, AV1或更高版本的编解码器). It also displays file 决议; 帧率; and minimum, maximum, and average 位rate.

地点: 位.ly / brv_dl

多少: 免费的

有趣的事实: You can zoom into the display with your mouse wheel to better view frame details.

看看它是如何运作的:
位.ly / SM_MI_BV YouTube(视频)

结论: 操作系统和文件兼容性的限制令人沮丧，但是你应该在每台Windows电脑上安装这个程序
在你的办公室.

文件分析工具

These tools allow you to analyse files that 比特率查看器 doesn't and provide much more detail. 但它们不是免费的.

TELESTREAM开关

Telestream开关

什么: 一个可以播放视频的Windows/Mac工具, 显示文件细节，如GOP结构和数据速率, 检查音量和字幕细节. Telestream提供三个版本(9美元).99, $199, 和499美元), and you'll need the $499 version to get the GOP view shown in Figure 3 and the data-rate view. 它可以检查大量的容器和编解码器，包括HEVC，但不包括AV1.

地点: 位.ly /遥控开关

多少: $499

有趣的事实: It can load two files at once and allow you to toggle between them or show them side by side. Figure 3 shows the file encoded with the Medium x264 preset on the left and Veryfast on the right. 你可以在超级名模的脸上看到拖拽条手柄.

结论: I wish Telestream offered a version with just the file visualisation tools and not the fancy production capabilities (captions, 音频音量, 出口), 哪些百家乐软件app最新版下载不使用. 仍然, it's the cheapest option for viewing GOP structure and data rate of files that 比特率查看器 doesn't support.

探测器265

探测器365

什么: 一个深度文件分析工具，运行在Windows, Mac和Linux上. 有两个版本:基本版, 它支持HEVC，但不提供命令行(391美元), 和完整版, 它支持HEVC, AVC, AV1, 和MPEG-2文件通过GUI或命令行($1,390). 有些功能对所有用户都有利, including the ability to display both data-rate and GOP views and compute Video Multimethod Assessment Fusion (VMAF), 多尺度结构相似性(SSIM女士), 峰值信噪比(PSNR值)得分. 其他的主要用于编解码器开发人员和编码供应商, such as the ability to validate HEVC files and visualise details like the HRD buffer and prediction partitions .

地点: 位.ly / SM_Zond

多少: Essential Edition, $391; Full Edition, $1,390

有趣的事实: Zond 265 can provide frame details like the percentage of compression achieved via inter- and intra-frame encoding and can identify reference frames used for each frame encode and the percentage of reference pictures each provided.

结论: The Telestream开关 is better if all you want are 位rate graphs and GOP structure views. 但如果你正在寻找深度文件分析，Zond 265是更好的选择.

爱德华视频质量估计

电子视频质量估计

什么: This resource sits between the analysis tools previously mentioned and the metrics tools that will follow, 提供深度文件分析, GOP和数据速率视图, 以及计算PSNR值等指标的能力, 媒体源扩展(MSE), SSIM, 和VMAF. 它与H兼容.264、HEVC、VP9和AV1. It offers excellent file-visualisation tools but is clunky; e.g., 在我们测试的版本中, we had to convert the source file to YUV before comparing it to the compressed files. Also, the programme doesn't support drag and drop, which is frustrating during high-volume usage. The command-line option works via an XML configuration file rather than a simpler and more traditional command-line syntax. 它可以在Windows、Mac、Ubuntu、CentOS和Fedora上运行.

地点: 位.ly / SM_VQE

多少: 网站上没有引用. When we reviewed it, the GUI mode cost $850, and the command-line version cost an additional $400.

我们的评估: 位.ly / SM_VQ_rev

结论: 如果您需要这两个文件，这是一个很好的选择分析和参数，但首先下载并测试试用版.

荣誉奖

Beamr视图: This free tool allows side-by-side comparisons of two files to assist in GoldenEye testing and shows the 位rate, 决议, 帧率, 框架式, 和每帧的PSNR值值. Beamr View由Beamr提供，以协助评估公司的产品, but you have to request a trial version that expires after either 3 or 6 months. 如果您想继续使用波束视图, 可按付费计划获得多座牌照(位.ly / SM_VU).

Vooya: Like Beamr View, Vooya enables side-by-side comparisons but provides less data per frame. It's primarily useful for projects that involve YUV or other raw formats that most players won't load but Vooya can. Mac和Windows系统的Vooya售价为20美元，但Linux系统是免费的。位.ly / SM_Vooya).

视频质量 Metric-Related工具

The primary function for the following tools is to compute and visualise video quality metric scores.

莫斯科国立大学视频质量测量工具(msu vqmt)

莫斯科国家VQMT

什么: 该工具计算一系列视频质量指标, 包括VMAF, PSNR值, SSIM, SSIM女士, 还有很多其他的. It can compare two files in the GUI simultaneously so you can compare codecs or encoding techniques. It displays the comparative metric score over the duration of the file so you can identify quality drops and where the compared files differ and then view the frames 自己. 命令行操作简单灵活，可以输出 JSON和CSV格式. 度量分数现在包括谐波平均值, 只要不是质量最差的框架, 最高质量的框架, 标准偏差, 和方差, 这些都为算术平均值添加了上下文. GUI runs only on Windows; the command-line version runs on Linux DEB
和Linux RPM.

地点: 位.ly / SM_VQMT

多少: 299美元- 999美元，视数量而定

有趣的事实: 莫斯科国立大学是最全面的HEVC和H的作者.264 codec comparisons, for which VQMT was developed, and also created Subjectify.Us是一个众包图像和视频主观评价的网站.

看看它是如何运作的: 位.ly / MSU_V12 YouTube(视频)

结论: MSU VQMT提供了易用性的完美融合, 表演, and data to help make informed decisions about codecs and encoding parameters.

Ssimplus vod监视器

SSIMWAVE +

什么: A browser-based tool for computing SSIMPLUS (SSIMWAVE's video quality metric) and displaying the results graphically with the ability to view the actual frames at any location in the file. Another view produces rate-distortion curves and BD-Rate computations to visualise and quantify the 表演 differences between codecs. 它可以同时比较多个文件, 因此，在比较两个以上的编码选择时，它非常有用. 它支持广泛的编解码器，包括H.264, HEVC, VP8, VP9和AVI，并且还支持高动态范围(HDR). SSIMPLUS is one of the few metrics that can compute scores from files of different 帧率s, 就像从1080p60源编码的720p30文件.

该软件运行在CentOS(任何受支持的文件系统)上。, VirtualBox, 它支持AWS和谷歌云平台的云计算功能.

地点: 位.ly / SM_VODMon

多少: 不披露

有趣的事实: SSIMPLUS是由周旺领导的团队开发的, SSIM算法的开发者, 谁获得了2015年的工程艾美奖.

结论: 获得SSIMPLUS评级的唯一途径. 它的操作速度非常快，而且GUI增加了很多价值.

荣誉奖

FFmpeg: A free open source command-line utility that can compute PSNR值, SSIM, 和VMAF. 没有简单的方法来可视化相关的框架, 然而, 在比较编解码器或评估编码技术时，哪个是关键的. This makes FFmpeg good for integrating into a production workflow but not optimal for research and analysis.