NAB 2018: Bitmovin Talks Codec Comparison Test Findings
At NAB, 1月时 met with about a dozen companies with stakes in HEVC and/or AV1. This is another in a series of video interviews he conducted with them.
1月时: 1月时 here back with you from the Bitmovin booth at NAB. 我和克里斯蒂安·费尔德曼在一起.
基督教Feldmann:Hi. 见到你很高兴.
At NAB, 1月时 met with about a dozen companies with stakes in HEVC and/or AV1. This is another in a series of video interviews he conducted with them.
1月时: 你拿比特莫温怎么办，克里斯蒂安?
基督教Feldmann: I'm working on encoders, so I'm in the encoding team. I'm working mostly on all of the encoders that we support, ranging from AVC up to we're investigating new technologies, AV1, 当然, 以及标准化, MPEG目前正在进行什么, 所以整个范围.
1月时: 这是AV1的NAB. 我知道你做了一些测试. 你的主要发现是什么?
基督教Feldmann: 基本上, we did an evaluation with the University of Klagenfurt. 我们创建了一个DASH数据集. 所以H.264当然在里面, HEVC, 还有VP9, 和AV1, using a snapshot from December from the AV1 reference software. We created a data set using various different settings, 各种不同的序列, and for that specific test with a fixed bit rate ladder, 我们发现AV1能够胜过VP9, 还有HEVC.
1月时: 你看到的比例是多少?
基督教Feldmann: We could see gains of AV1 compared to HEVC of about 17% on average BD rate [Bjøntegaard-Delta比特率].
1月时: So BD rate means at 17% lower bit rate it produced the same quality?
基督教Feldmann: 正确的. PSNR基本上就是测试.
1月时: And what were your findings regarding encoding time? 你是怎么做到公平竞争的? Because HEVC, obviously, can encode forever if you use those settings. How do you get it roughly equivalent on the encoding time side?
基督教Feldmann: In this test, the encoding times were not identical. 基本上, so the AV1 reference encoder we used is not optimized for speed at all. It's an experimental encoder, basically, meant for experiments. 它目前没有针对速度进行优化. We tried to estimate at what speed AV1 would operate once optimized. 真是瞎猜的. 很难对所有这些设置进行比较. All of the settings are, 当然, in the description of the data set and the associated papers. All of the codings, which codings we used, which settings we used, that's all in the paper.
1月时: 人们在哪里可以找到报纸?
基督教Feldmann:你可以在我们的 主页, 有一个数据集的链接, which is publicly available and 当然 to the associated paper with all of the details.
1月时: 这就是比特移动.com?
基督教Feldmann:这是bitmovin.com, and then there's a blog page, and 有一个数据集的链接 and to the paper.
1月时: What's your sense of when people will start using AV1?
基督教Feldmann: Well the standardization is just finished, so the final bitstream is now available. It will probably take some time until we can see fast and efficient encodings which can actually be used at a reasonable CPU cost, 这需要一些时间. But considering that the standard was just released, that's not unusual, I would say. 可能在2018年, 今年之内, we will see some usable encoders and some more reasonable outputs there.
1月时: 你从实时测试中学到了什么? You guys did some real-time streams, last year here. 对吗?? You produced real time streams on the encode side and then decode via Firefox, is that right?
基督教Feldmann: The decoding demo's also probably available on our 主页. 在Firefox夜间运行时，您可以使用DASH进行流传输. I think the live encoding demo we did, here at the NAB, that's true. 基本上, 我们使用了水平可伸缩的编码方法, where we chunk up the video and just distribute it in the cloud, so we were able to use that in order to achieve real time encoding using the rather slow reference software encoder.
1月时: 好吧. Well listen, Christian, I appreciate you spending time and have a great show.
基督教Feldmann: 谢谢你！.
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