Now I know that x265 can be around 50% more efficient than x264, and that YouTube needs it higher quality coming in so when they re-compress it it will still look good. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 28 and 23 are the default CRF values of x265 and x264 respectively, hence the supposed equivalence. I dont use x265 for anything besides 4k HDR content. Thanks for contributing an answer to Stack Overflow! Every modern browser on desktop and mobile supports it, except Safari on iOS. What you want is a min quality level at resulting in a variable bit rate. Older versions must use -x265-params keyint=1. You will have to tweak A LOT of the extra complex settings of x265 encoder to even MATCH x264, let alone surpass it in size to perceivable quality, and by the time you do, you will see that x265 is just a order of magnitude slower than x264 to achieve marginally better results which is very problematic with 4k encodes. Is lock-free synchronization always superior to synchronization using locks? Whereas FFmpeg can deduce the required output format of a file depending on the selected extension of the output file, it is recommended to explicitly declare the output format (through the -f option) so that extra options can be passed to the underlying muxer if needed, as is often the case with streaming formats such as HLS, mpegts and DASH. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. is there a chinese version of ex. I mean there are many improvements that have been made in NVENC and NVENC HQ should be equal quality compared to default x264. WebM is an open, royalty-free media file format designed for the web. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. This is a good starting point on why these values matter. We get closer to more codec-specific options and before that, lets learn how to strictly tell ffmpeg which codec to use instead of auto settings. If a law is new but its interpretation is vague, can the courts directly ask the drafters the intent and official interpretation of their law? The honest to god true answer is it depends, however I find that answer unsuitable for my own needs. ffmpeg creates large compressed files for tiny videos? By using CRF 15~18 vslow, Film TUNE, and 5.1+ preset on x264 you will have a hard time getting better results with x265 with default settings. But the quality is not as good as expected. Transcoding FLV toMP4 with ffmpeg very slow, FFMPEG resize video not working in browser or IOS. Asking for help, clarification, or responding to other answers. The horizontal line shows this where x264 needs 14Mbps to match x265s 9Mbps, a 5000kbps difference! That said, you can try to establish your own calibration between the current versions of the encoding libraries in your ffmpeg by running the following command, which executes two popular video quality metrics: The final lines of the console output will contain: So, run the command once with the x264 output and once with x265 and compare with different x265 outputs, till you get similar measures. (This will generate a logfile that ffmpeg needs for the second pass. x265 uses CRF 18 by default. Both values result in a very similar bitrate for both videos, just a syntax difference due to different accepted number range. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. To learn more, see our tips on writing great answers. If you have an easily compressible video, it wont bloat the encoded video to meet some arbitrary bitrate. The SSIM result is done frame by frame, so we have to average them all together to see which is best overall. Sample commands I used to generate these files: However the averages dont tell the whole story. I did three CRF videos first, at 22, 20, and 18, then using their resulting bitrates created three ABR videos. However, I head that this cap was removed. As always, start by specifying a preset. Should I include the MIT licence of a library which I use from a CDN? On the section of video I chose, x264 needed considerably more bitrate to achieve the same score. However, there is still a solution. Of course, these metrics aren't perfect but you can use them as a rough guide to establish equivalence. The number of distinct words in a sentence. See a list of available x265 profiles. Additionally to the previously mentioned arguments, ffmpeg VP9 and H265 codecs accept -crf flag . - Code Calamity, Animated AVIF is finally coming to Firefox, AMD improves video encoding yet again! My first step is to convert images into yuv format: ffmpeg -f image2 -i "C:\DATA FOLDER\images%d.png" video.yuv And I try to convert it as a .mkv file, losslessly: Famous codecs are H264, H265, and VP8/9. Now this is an apples to oranges comparison. Unfortunately, the same can't be said about videos. This is needed for functions such as resize,pixel format conversations, de-interlacing, etc. . https://gist.github.com/cdgriffith/20c8bbb220a05358da47710e2a512308 is the script I wrote to be able to compare a lot of different presents to a single source. Another flag you can pass is -movflags faststart. Thank you!! Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. This is why the duplicate flag has been declined. CRF is the best of both worlds. Also note that the highest marker on this chart is 0.98, compared the total average charts 0.995. Bulk compress videos to H.265 (x265) with ffmpeg Published on 2020-04-21 python automation Despite being a relatively modern phone, my OnePlus 6T records video using the H.264 codec rather than the newer H.265 HEVC codec. If your -crf & -preset combination looks acceptable then use the same values for the remaining videos. Thanks for contributing an answer to Video Production Stack Exchange! It states that for 4K videos with x265 they suggest a Constant Rate Factor (CRF) encoding in the range of 22-28 (the larger the number the lower the quality). To learn more, see our tips on writing great answers. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. I personally think the extra 2500kbps for the large jump in minimum quality from CRF 24 to CRF 22 is a must. Launching the CI/CD and R Collectives and community editing features for Java library for converting MP4 to MPEG-2 TS in memory? All tests run using one of the animations we've made for a recent project. Aka a old movie with lots of film grain will need a lot higher bitrate than a modern action / adventure move, which will itself needs a lot higher than an animation. I have read that previously, Chromecast used to limit playback at 11 Mbps. When you omit this option, ffmpeg uses -crf 32 for VP9 by . Could the loss of quality be caused by VLC and its experimental support in deconding h265? -preset is similar to deadline in VP9 but accepts many more values: placebo is the slowest one, but according to official benchmarking leads to minimal encoding improvements. Think of video format as a container that defines file structure for carrying video and audio streams. I use both as .bat files. Even if there is no sound in a file, there could be empty audio track information that will occupy some additional weight, so always use it for muted videos. In the past, I went straight to Handbrakes documentation. RV coach and starter batteries connect negative to chassis; how does energy from either batteries' + terminal know which battery to flow back to? The quality difference between llhp and llhq as measured by Netflix's VMAF is virtually negligible, yet the encoder's performance boost (over ~30% on my test bed) with the former is definitely appreciable. If you like I"d be happy to test one of your .ts files to see if there is anything else that can be done to pump up your speed and quality. (if you go higher than 4.1 preset). (As a heads up h.265 is the specification, and x265 is encoder for it. and also why slower and veryslow SSIM is lower than slow preset? Find centralized, trusted content and collaborate around the technologies you use most. It seems like a flaw in the encoder; it performs predictably in every other respect, but it needs (for example) -b:v 4M for a 720p file or -b:v 8M for 1080p. Even if your source video doesnt use the HDR color space, it compresses better. The Compilation Guides show you how to do that. The absolute path to the output file. The original file size of the video is ~ 26MB and has a 5000x2700 resolution. An addition to the previous comment. Encode some random segments from typical inputs. The bitrates are as expected, the higher quality it gets the more bitrate it will need. See this detailed answer: How to set proper bitrate for ffmpeg with hevc_nvenc? . By default, this is disabled, and it is generally not required to set a tune option. Was Galileo expecting to see so many stars? Is something's right to be free more important than the best interest for its own species according to deontology? The webm was quite small, but take many times the amount of time that mp4 took. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, We've added a "Necessary cookies only" option to the cookie consent popup, How to specify CRF quality settings for different encoding software, Trying to sync audio in mpeg2 video whose video freezes first 8 seconds in playback, FFMpeg concat demuxer corrupted output (freezed video on some concatenated parts). I want a setting that I can use on any incoming 4K HDR video I buy. Predictable file sizes are a priority. The real question is HDR. Some popular examples of video formats are mp4, WebM, or MKV. First thing I did was to chop out a minute segment and promptly remove the HDR. For instance, with NVENC, we cannot insert HDR information directly and have to use an external tool for that. Or for GPU-based encoding, which is much faster, but . Any idea what might cause this? If libx265 is too slow use libx264 which is faster but file size will be bigger. By Edgewall Software H265, a.k.a HEVC (High-Efficiency Video Coding), is a codec supported by Apple and shows the same 20-50% better efficiency than its H264 older brother. The difference between the input and the output is practically non-visible for 1080p videos. I've gone through this sub and tried to improve my transcodes, but I'm still not 100% there. Was Galileo expecting to see so many stars? Strange that the video playback stops if the transcoder gets too far ahead, reaching its buffer limit, on the audio track only? Modern web development every year applies new standards for performance. Learn more about Stack Overflow the company, and our products. To some, including myself, it could be worth the extra 4000kbps jump from CRF 22 to CRF 20. Dont be sad though, there is a solid alternative for iOS users. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. This is most useful for workloads such as live streaming where broader compatibility with a wider variety of devices is expected, and as such, performance crippling features such as B-frames can be omitted altogether for a good trade-off between higher bit-rates in use and throughput. . For H265, we need to learn some more extra options. Declare your inputs. Use the -x265-params lossless=1 option. Use this mode if you want to retain good visual quality and don't care about the exact bitrate or filesize of the encoded file. Great explanation. thank you, I'll try it now and feedback you later ^^, I use it to decrease scale. You're still doing high bitrate encoding. Here we can see x264 has a much harder time at lower bitrates. If you wish to master the tool, you will have to learn how to use flags. -vf - the option for passing filters to ffmpeg. These gains will be most pronounced at resolutions of 1080p and higher. The only point of using x265 is for compatibility, lossless and HDR content, otherwise, even at SDR 4k x264 will fare better if given enough bitrate. Making statements based on opinion; back them up with references or personal experience. 3 seconds at the start is nothing as long as the movie plays fine. Find centralized, trusted content and collaborate around the technologies you use most. Best settings for converting from h264 to hevc? The Compilation Guides show you how to do that. Pass any arguments to FFmpeg (such as -loglevel to it directly) before declaring inputs. But i don't think that I am doing it in the most effective way. Ackermann Function without Recursion or Stack. compression.ru/video/codec_comparison/hevc_2015/. Download the SSIM data as CSV. Really awesome! ffmpeg has more video optimization settings available, such as Constrained Quality, Two-passes, Constant bitrate, and Lossless. Put simply, the closer the result is to 1 the better. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. However, that does not mean smaller file size at the same CRF. You can also download a static build, all of which bundle libx265. Is this enough, or should I take some other things into consideration as well? ffmpeg is a CLI tool and it has a lot of options that is nice to know. Ive got the right version of FFmpeg with libvmaf but am having a hard time getting the right CLI parameters. Providing tools to analyse, process, transcode, and deliver images and videos, on the shoulders of state-of-the-art cloud, media and AI technology. Getting ffmpeg with libx265 support ffmpeg needs to be built with the --enable-gpl --enable-libx265 configuration flags and requires x265 to be installed on your system. CEO at Pixel Point and software engineer with 10+ years of web development experience. Could very old employee stock options still be accessible and viable? In this article, we will learn about codecs like VP9 and H265, and how we can optimize video using ffmpeg tool. Your video is 10 minutes (600 seconds) long and an output of 200 MiB is desired. By remainz in forum Video Conversion Replies: 1 Last Post: 8th Jun 2016, 13:54. For better visualization, I am going to show you how applying different options to ffmpeg decreases the file size and changes the quality. What would be the most time effective format and how to convert a raw h.265 video to it? Asking for help, clarification, or responding to other answers. See HWAccelIntro for information on supported hardware H.265/HEVC encoders. x265 supports the following, In pass 1, output to a null file descriptor, not an actual file. But they either increase the encoding time significantly or require more tries to find the best bitrate setting to achieve similar results that you can do with Constant Quality (crf) mode. And since you're on Windows, you may want to remove the shell escapes \ above as I'm writing this from a Unix box testing the command above. CRF affects the quality. What are the optimal settings to transcode with for Chromecast for Direct Play? Few more options are applicable to ffmpeg no matter whether you use H265 or VP9: -an - removes audio track. Currently focused on React, Next.js, Gatsby. Here is the order in which you have to pass arguments to FFmpeg: (b). There aren't some commercial products based on x265 nowadays? Note: Windows users should use NUL instead of /dev/null and ^ instead of \. Sorry for the long post. Making statements based on opinion; back them up with references or personal experience. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Video and audio streams inside these containers are multimedia data encoded with codec. For local resources (on an accessible filesystem), the absolute file path is needed. Has Microsoft lowered its Windows 11 eligibility criteria?
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