8/30/2023 0 Comments H 265 codec windows 7![]() The third leg of the performance triple crown is the CPU required to play back the streams. ![]() It looks like VP9 will be the cheapest to encode of all three, particularly once MainConcept implements two-pass encoding. Obviously, when it comes to encoding, time is money. Times with the green background are the fastest, and as you can see, VP9 won two of three trials, despite using two passes, while MainConcept only used one. ![]() The results can be found in Table 2, with all times shown as minutes:seconds. After encoding, I confirmed that the quality of both the x.265 files and VP9 files were consistent with what I had been provided. I also enabled multiple columns and multiple threads to use more of the cores on my HP Z800. With VP9, I encoded using presets supplied by Google, which used the Good preset and a speed of 1, which is designed to supply a good balance between encoding quality and speed. According to tests performed for the aforementioned article, encoding at the highest setting, 30, would have taken 230 percent longer and only would have delivered an extra 1.39 percent improvement in quality. ![]() With MainConcept, I used 27 for the P/Q value, which controls the quality/encoding time trade-off. Though Placebo took about 73 percent longer than Slower, the quality was only 2.44 percent higher, so we didn’t leave a lot of quality on the table using Slower. To put this in perspective, in tests performed for a how-to article on encoding HEVC in the Streaming Media Sourcebook, I ran some comparison encodes between the Slower preset and Placebo, the highest-quality preset. To test x265, I used the command script used by MulticoreWare, which used the Slower x265 preset. I encoded all three resolutions of the New Test clip, which is 1 minute, 36 seconds in length, with X.265, MainConcept, and VP9. To test encoding time, I encoded all clips on my 12/24-core Z800 workstation configured with two 3.33 GHz X5680 Intel Xeon CPUs and Windows 7 running on 24GB of RAM. So let’s move to the next factor, encoding time. ![]() So despite the results shown in Table 1, it appears that if and when MainConcept implements dual-pass encoding, overall quality should be very close to x265. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |