视频:用视频工程工具在被子下面

观看这个演示的完整视频流媒体西部, VES101:工具 & 诊断技术 & 解决大型活动中的问题，在… 流媒体会议视频门户.

阅读这段录音的完整文本:

大卫·哈桑: 当我们钻进被窝的时候, 这是我们遇到的最大挑战之一, 是,, “好吧, 伟大的. 有一个问题.“通常情况下，这与广告插播或其他事情有关? 当我们混合不同的内容进来时. 这增加了各种事情变坏的可能性. So understanding what's happening and what we're actually playing in looking at the actual content, 我们最终必须快速完成的关键事情之一是什么, 知道发生了什么.

媒体信息

One of the first tools I ever started working with for kind of getting a view for what the media's actually set up like, 编解码器是什么, 所有的细节, 是一个叫做媒体信息的工具吗. 它是免费的，有一个命令行，还有一些你可以集成的东西. I worked with customers to integrate this tool into their whole workflows for gathering out a bunch of data. 或者从GUI的角度来看它很棒. 这是我经常做的第一件事, 好吗，很好, 我知道广告的内容, 我看了一下广告的开头，这是个问题, 我把这两个TS段都拿下来, 然后在媒体信息中打开它们, 看看它们有多不同.

如果有什么东西真的不一样, 在编解码器中有时甚至是尺寸或质量等因素, these are things that can lead to crashes 特别是在OTT设备上 and stuff that are a little bit more sensitive. So this gives you a full breakdown of your audio, your video data and its packaging. So it's good for a visual root and really quick to be able to see what's going on. If things have different profiles or other stuff midstream that can cause other problems, those are things that we look for that can be a quick win to see if your media wasn't prepared properly, 因此我们知道我们要把它送回去.

视频帮助比特率查看器

BitRate Viewer is an old tool that's not in development anymore but I still use it on occasion. 它是免费的. 你可以拉入任何视频文件, 包括部分, 它会告诉你这里的实际带宽波动, 这是一种很好的视觉表达方式, “嘿, 我说过我想把比特率的目标定为2Mbps." And coders will say, "Oh don't worry we'll limit it we won't spike more than x amount.“反正很多人都是这么做的. 这个可以让你看到. And that can be a problem if you're having a lot of switching problems and you need to actually validate what's the actual bitrate is in the content versus what we say it is to see if we're having an adherence problem or the performance aspects that are caused by that.

Eyevinn片段分析仪

这是我前几周偶然发现的. Jun Heider was in Sweden at a conference and he came across guys who did this, this is a web based one I'll pop this up 正确的 now because it's actually pretty cool what they are doing all of this web-based. 在这里, 你来到这个网站，它给你一个选择, 好了, 指向任意视频片段, 这里是一个TS文件. 正确的? And you can say Parse, it loads it, and it actually does a deep analysis on that segment for you. 它会显示视频包, 平均比特率, 你的音频包, and lets you kind of dive in a little bit more and see some of the stuff. So it's actually pretty cool when you want to get a little bit deeper showing PTS, 你的时间, 等等. 这很方便. 无论如何，这都不是结束, but it's free and it's something to show what you can do just with web technology 正确的 now as well.

电子流分析仪

电子流分析仪 is a very powerful tool when you need to do deep analysis of content. 如果你真的需要深入到位的层次去检查一下, 查找某个字节, data, at certain positions when it should because something might be wrong in the video. 这个工具可以很容易地做到. 但你需要知道你在看什么. We've had instances that we've had to use this to make sure that a chunk does start with the proper initial character or something when we had video that we knew was corrupt but we didn't know why.

We worked with the guys at iStream Planet they're actually the ones that turned me onto this tool back in the day. And it can be useful for doing a deeper analysis, this is not a cheap tool. Elecard makes some really really good products though when it comes to doing even live stream monitoring and 等等 they have a Boro product that's really cool for doing live QA and 等等 and Stream Analyzer is one of their smaller products but does a nice deep dive when you need it. 我不会在这个问题上讲得太深. 我想我有，如果我们想看一眼的话.

FFprobe

所以我希望你们大多数人都听说过FFmpeg. FFprobe已经有一段时间了. There's a 伟大的 command-line tool when you need to get some 信息 out of what's actually in your video chunks or your video stream. 那 can be useful for checking compliance and making sure that things are what they're supposed to be and that there's not any major issues that you can identify quickly in that regard. Something that a lot of times gets integrated into automated workflows or the stuff as well because it's pretty powerful fairly quick and does a good job. 我们最近也经常使用Bento4和Shocka, Bento4有一些不同的东西他们有mp4信息工具, that's going to give you some really good 信息 about the packaging and the structure of it. 这真的很有价值. 还有mp4转储, this gives you some really good deeper date on the actual structure of the file and how things are looking when you need to see deeper data this is really good. 是否支持JSON输出等等.

One of the things that we run into unfortunately I've seen it happen quite a few times to different customer is things when it comes to the packaging, especially once again for working with ads but even when it's not ads sometimes for other reasons, 比如细分过小, 正确的? 通常有四秒的片段节奏，然后, 有广告, 应该是30秒的广告，但实际上是30秒.1秒，因为有人没有做他们应该做的事. 那 .1秒就能让你的设备崩溃. If it doesn't have the appropriate amount of data and keyframes it will load in, 特别是在OTT设备上, 然后它会使应用程序崩溃. 这是件坏事. 这就是您可以使用工具进行监控的地方, especially if you have an automated system to check for that type of stuff, 会非常非常有价值吗.