Find centralized, trusted content and collaborate around the technologies you use most. Is this the best possible solution, or is there a better way of doing this? 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. Replies: 2 Last Post: 20th Jul 2015, 11:17. Not the answer you're looking for? Can I use a vintage derailleur adapter claw on a modern derailleur. Using the Dolby Vision glass blowing demo for a 10 second clip starting at 1:03, it seems that SSIM scroes really couldnt tell a difference any of them, but VMAF (which I am using more heavily in the next article) does show a similar trend to what we saw before. It is not a royalty-free codec - perhaps, that is why the adoption rate is much less than of WebM's. I used a three minute 4K HDR clip, using Handbrake to only modify which present was used. The snippet above assumes that the input file is an MPEG2 stream. ), In pass 1, you can leave audio out by specifying, P. Hanhart et al., Subjective quality evaluation of the upcoming HEVC video compression standard (. Try running ffprobe on it ( ffprobe -i filename.ts -show_streams ) to see what the format and colorspace are, for HDR should be: pix_fmt=yuv420p10le color_space=bt2020nc color_transfer=smpte2084 color_primaries=bt2020, (Windows ffmpeg/ffprobe package https://ffmpeg.zeranoe.com/builds/, others https://ffmpeg.org/download.html), Found this incredibly helpful, as Ive recently begun ripping Blurays to x265 instead of x264, particularly when I got my new 12-core Ryzen 3900X. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Press question mark to learn the rest of the keyboard shortcuts. explicitly disabled interlaced encoding on Turing, github.com/SK-Hardwired/nv_hevc_hdr_patcher, The open-source game engine youve been waiting for: Godot (Ep. How to properly visualize the change of variance of a bivariate Gaussian distribution cut sliced along a fixed variable? This is why the duplicate flag has been declined. In the same breath, note that NVIDIA has explicitly disabled interlaced encoding on Turing across all tiers, even the 1650 uses the older Volta NVENC encoder. I wanted to thank you for all this great work youve done on these articles. compression.ru/video/codec_comparison/hevc_2015/. Connect and share knowledge within a single location that is structured and easy to search. Using video for animation with proper optimization is always better than GIF and sometimes outperforms native implementations. The real question is HDR. If you are encoding to x264 or x265, encode to 10-bit if your devices support it. Activating support for hardware acceleration when building from source requires some extra steps: Clone the FFmpeg git repository https://git.ffmpeg.org/ffmpeg.git In this article, we will learn about codecs like VP9 and H265, and how we can optimize video using ffmpeg tool. I believe that the last value of 31.6 Mbps is exceeding the capacity of the Chromecast v2. . rev2023.3.1.43269. Press J to jump to the feed. Why are non-Western countries siding with China in the UN? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Because if every frame was that good, we shouldnt need more than 6Mbps x265 or 10Mbps x264 4K video. Add it next to your -c:v h264_nvenc -c:a ac3 You should also be able to push 2 sessions. Zero-delay or sliced thread mode has no delay, but this option farther worsens multi-threads quality in supported encoders. You can also download a static build, all of which bundle libx265. The short answer to the deviation from expected performance is that x265 is still under "heavy development". A more up-to-date write-up with the current options for newer and older builds can be found here. 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. So, if generally the CRF of h265 are "better" qualitatively speaking than the x264 ones how is possible that the encode results of x265 is worst than x264 with same CRF ? It looks to take about a crf increase of 2 to achieve near parity of medium to slow (aka 18 medium is close to 20 slow). Thus comparing the two encoders via their default 8-bit compressors.I found this code to convert the 10-bit HDR yuv420p10le colorspace down to the standard yuv420p 8-bit colorspace from the colourspace blog so props to them for having a handy guide just for this. So lets take a step back and look at the lowest 1% of the frames. Is email scraping still a thing for spammers. My experience with using nvenc is that you need to tell it what bitrate you want -- it defaults to VBR, which is fine, but no amount of tuning makes up for the fact that it always wants to give you a 2M average bitrate no matter what resolution file you feed it. To learn more, see our tips on writing great answers. Hope that helps, thanks for asking and happy to help! As I'm new to this, I tried doing some research and found that mostly it's about choosing the correct CRF and preset, so I am thinking it would be sufficient to write a script which iterates through these, creating samples which I could look at and decide what's the best option for a given (set of) video(s). Does Cosmic Background radiation transmit heat? Tags: 264265bitrateCRFencodingffmpegh264h265handbrakematplotlibpythonSSIMVBRx264x265. But that impacts quality so you will need to test to see what quality is acceptable. @llogan. By MvL in forum Video Conversion Replies: 3 Last Post: 8th Jul 2014, 17:55 . Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. See a list of available x265 profiles. Call up the binary. How do I avoid objects having flickering edges when I encode a screen recording to mp4 using x264 and ffmpeg? As an alternative to -crf its possible to use -b:v, which allows manually defining the bitrate of the video(read more). The SSIM result is done frame by frame, so we have to average them all together to see which is best overall. Create an account to follow your favorite communities and start taking part in conversations. I tried to look up the documentation, but i simple don't have the multimedia background to understand it. Keyframes need more data then other frame types to avoid pulsing poor quality keyframes. How did Dominion legally obtain text messages from Fox News hosts? Of course, these metrics aren't perfect but you can use them as a rough guide to establish equivalence. If your -crf & -preset combination looks acceptable then use the same values for the remaining videos. (Well get to that later.). I know from some small scale testing that the gaps between the different presents will remain similar (newer article has better graph for that). This method is generally used if you are targeting a specific output file size and output quality from frame to frame is of less importance. Both values result in a very similar bitrate for both videos, just a syntax difference due to different accepted number range. Not sure if theyre agnostic of resolution. ffmpeg -i data2.mp4 -c:v libx265 -c:a copy d2.mp4 However when I use the hevc_nvenc, I get a very high bitrate (about 2M), I need to have a bitrate as low as possible and keeping almost the same quality. Quality perception for dynamic pictures differs severely compared to static images, so hacks like this help your video appear of good quality even in case of further reducing the size of a video. Easiest way to remove 3/16" drive rivets from a lower screen door hinge? Even if your source video doesnt use the HDR color space, it compresses better. rev2023.3.1.43269. Was Galileo expecting to see so many stars? It's therefore wise to limit thread counts on encodes where latency matters, as the perceived encoder throughput increase offsets any advantages it may bring in the long term. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Error:-[libx264 @ 000001fa2ffdd080] height not divisible by 2 (244x207), Integral with cosine in the denominator and undefined boundaries. https://www.youtube.com/watch?v=bzgFL-gNF9g. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. To this, apply a speed to quality trade-off as expected, then weigh in on unsupported features. Making statements based on opinion; back them up with references or personal experience. I dont use x265 for anything besides 4k HDR content. is there a chinese version of ex. You get to choose the bitrate. Learn more about Stack Overflow the company, and our products. 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. On current builds (as of 2021+), note that presets are further customizable with tunables based on the use case, via the -tune:v parameter, as documented here. I mainly use Handbrake now use ffmpeg because I learned Handbrake only has a 8-bit internal pipeline. At this point, it would be imperative to mention that decoders have specific constraints, such as expected input resolutions, supported codecs, etc, and as such, it's recommended that in production, to determine and validate the need for hardware-accelerated decoders as failure at this stage results in a failed encode and is unrecoverable. If libx265 is too slow use libx264 which is faster but file size will be bigger. x265 uses CRF 18 by default. First thing I did was to chop out a minute segment and promptly remove the HDR. Why did the Soviets not shoot down US spy satellites during the Cold War? I mean there are many improvements that have been made in NVENC and NVENC HQ should be equal quality compared to default x264. ffmpeg -i "input.mkv" -pix_fmt yuv420p10le -c:v libx265 -preset slow -crf 28 -c:a copy -x265-params profile=main10 "output".mkv You can use ffmpeg as a beginner just by running: The output will be WebM encoded with VP9 with a pretty decent compression out of the box. Here we can see x264 has a much harder time at lower bitrates. So what *is* the Latin word for chocolate? *** ### Encode video as x265 HEVC 10bit. ac3 should give you a 15%+ boost in speed. If the same information really answers both questions, then one question (usually the newer one) should be closed as a duplicate of the other. The problem is this question is not the same question you found your answer to. ffmpeg -i input.h265 -c copy -movflags +faststart output.mp4 The camera's H.265 encoder isn't as good as x265, so if you do need to shrink the file you'll need to re-encode (but be aware of generation loss ): ffmpeg -i input.h265 -c:v libx265 -crf 28 -preset medium -movflags +faststart output.mp4 Adjust -crf and -preset to your liking. Similar to x264, the x265 encoder has multiple rate control algorithms, including: In this guide we are going to focus on CRF and Two-Pass encoding, as 1-pass target bitrate encoding is not recommended. Which is very similar to others results as well, so Im personally sticking too it. This is a good starting point on why these values matter. 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). As I've previously mentioned, the original file resolution is 5000x2700, but we don't use it that big, and we can try to reduce it to the size that is relevant to the page. All Rights Reserved. Declare your inputs. 20 medium 66.884759 0.9598, 22 slow 67.187793 0.959167 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: Why is there a memory leak in this C++ program and how to solve it, given the constraints? 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. When it comes to images, almost every framework, headless CMS, or CDN offers built-in optimization options. Something wrong with reddit clipboard. But that is all hypothetical. 1 When I transcode video to H265 with following command, I get a bitrate about 600K and the quality is almost the same as the original. While its narrow versatility makes it incredibly frustrating to work with, there's never been another video player in history that scrubs as well, or uses laptop CPU/battery as efficiently. Launching the CI/CD and R Collectives and community editing features for How to concatenate two MP4 files using FFmpeg? Open a 2nd command line and encode another .ts at the same time. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, How do I convert 10-bit H.265 / HEVC videos to H.264 without quality loss? How to increase the number of CPUs in my computer? 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. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. In our case it is 3840px width. Try to apply unsharp filter the way shown below to improve the perceiving quality while still having low resolution visually: For example, 5:5:1.0 will result in medium sharpness; for the light one, try to use 3:3:1.0, and for the strong one, pass down 9:9:1.0. I ran some quick tests this morning with a script I am using for a new version of this article using ffmpeg instead of Handbrake. 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? I'm using my FFMPEG with the suport of my GPU (NVENC) to convert files from my satelite receiver (SD, mpeg2 .TS-Files) into h264 .mp4-files. Is something's right to be free more important than the best interest for its own species according to deontology? Profile ( -profile) The profile determines which features of the codec are available and enabled, while also affecting other restrictions. Generated via Python and matplotlib (Click to view larger version) Here we can see x264 has a much harder time at lower bitrates. Encode some random segments from typical inputs. Antn Garcia. Slower = better video quality and compression. You canread thisdoc for more info on this. Centering layers in OpenLayers v4 after layer loading. Keep in mind Im talking exclusively of x264 level 5.1+. 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. So, by clever combination of webm + VP9 and mp4 + H265 for our videos, we can achieve 94% global coverage. My observation is confined to standalone x265 or its deployment, whether in ffmpeg or anything else. Thanks for contributing an answer to Stack Overflow! On my computer (a fairly good laptop) it usually takes half the video playtime to convert into a mp4 using a generic ffmpeg command that i simple copy and paste from stackoverflow. (g). Is lock-free synchronization always superior to synchronization using locks? Asking for help, clarification, or responding to other answers. Use CRF 23+ for videos in 4K. Please do not post the same answer to multiple questions. Use the -g 1 option for FFmpeg 4.3 and newer or if you're using a build from the git master branch. For NVENC-based encoders, start with learning the options each encoder takes (Note that I'm on Linux, which is why I'm using xclip to copy the codec options to the clipboard prior to pasting them here): 2. When you omit this option, ffmpeg uses -crf 32 for VP9 by default. You can indicate this by, i can link the answer to the other question. hevc_nvenc option information. Applications of super-mathematics to non-super mathematics. A home for professional coders articles, opinions and ideas. For two-pass, you need to run ffmpeg twice, with almost the same settings, except for: For libx265, the -pass option (that you would use for libx264) is not applicable. And embedding it to the project with this html getting the best possible result. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Ive specified it to 3x the 8Mbps (so 21M). Your mileage will definitely vary, based on your source content, filter chains in use, specific pltform configuration variables (such as your GPU and driver versions), etc. Maybe something more visible at lower bitrates? Reddit and its partners use cookies and similar technologies to provide you with a better experience. Call up the appropriate video and audio encoders, and pass necessary arguments to them, such as mappings, bitrates, encoder presets, etc. Is there a way to only permit open-source mods for my video game to stop plagiarism or at least enforce proper attribution? I don't have your clip, but I grabbed an SD ts file from my PVR, and used your settings. Therefore I played it safe, bump it down a notch and just encode all of my stuff with x265 10-bit at CRF of 20 on Slow preset. rev2023.3.1.43269. Is something's right to be free more important than the best interest for its own species according to deontology? (And if I ran these tests first, I would have even used slow for all the other testing!). You can speed up and slow down encoding ruins presets. It is less efficient in terms of optimization and does not have Constant Quality mode (-crf) and presets we used in the previous example. Handbrake has a GUI, and it makes it much easier to use; however, using ffmpeg is a more flexible option in case you want to render videos with alpha(transparent) channels or use hardware acceleration that speeds up compression a lot. Making statements based on opinion; back them up with references or personal experience. Through some experimentation I found that I personally never can really see a difference between anything lower than 22 using a Slow present. Between H.264 and H.265, from what I've read the difference is about 30%, which is an impressive improvement at that point, considering how efficient H.264 already was, but from a practical standpoint it's too small to justify a systematic conversion just for the sake of saving a few gigabytes (or even hundreds of gigabytes - you may end up Reddit and its partners use cookies and similar technologies to provide you with a better experience. Quality degradation is more prominent with higher thread counts in constant bitrate modes and near-constant bitrate mode called VBV (video buffer verifier), due to increased encode delay. A few interesting options for us are: libvpx-vp9 - which is used be default when you convert to WebM using VP9 codec, libx265 - for H265 code and mp4 container, hevc_videotoolbox - for H265 with a hardware acceleration. 3 seconds at the start is nothing as long as the movie plays fine. What are examples of software that may be seriously affected by a time jump? However most devices finally have some native h.265 decoding. Using ffmpeg for streaming video composition from Python : why the sound is cut only when streaming into a mp4 file ? Setting up NVENC (for Streaming) Modern OBS Studio has two ways to achieve the expected quality: the built-in NVENC H.264 (new) and the addition from StreamFX called NVIDIA NVENC H.264/AVC (via FFmpeg). If you look at the PDF I linked in the last comment, there are many encoders out there - most proprietary. 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. They have some good detail on what things mean. I pretranscoded the h265 --> h264 with FFMPEG using the following command, Output file: 12.1 Mbps 1080p h264 7.1 AAC mkv. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. ffmpeg -c:v libx265 -preset fast -crf 28 -tag:v hvc1 -c:a eac3 -b:a 224k -i <source> <target>. Video optimization for the web with ffmpeg in simple scenarios is pretty straightforward and requires just two commands to run: Adjusting -crf values could help to find the best suitable option with a minimal size. The number of distinct words in a sentence. However, there is still a solution. Was Galileo expecting to see so many stars? Then I recently read YouTubes suggest guidelines for bitrates. Even thought the file size was much larger for the CRF 16 Medium encoding than it was than for the CRF 18 Slow! Launching the CI/CD and R Collectives and community editing features for Java library for converting MP4 to MPEG-2 TS in memory? 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. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Easiest way to remove 3/16" drive rivets from a lower screen door hinge? Well, the size was the same (7,7MB, instead of the 3,8MB using the ffmpeg -i without any other option), but it was fast. Find centralized, trusted content and collaborate around the technologies you use most. The webm was quite small, but take many times the amount of time that mp4 took. Cookie Notice The slow preset was used as it was determined to be an ideal choice in previous tests. When comparing to standard 4.1 profile than yes, x265 outperform it in almost any metric. ffmpeg - Read raw Data instead of converting to different Format, What is the fastest method to compress videos before sending in React Native Chatting app. I was afraid of lock my server if for some reason too many cameras send files at the same time, and this just simple solve my problem. Ive got the right version of FFmpeg with libvmaf but am having a hard time getting the right CLI parameters. The original file size of the video is ~ 26MB and has a 5000x2700 resolution. What are examples of software that may be seriously affected by a time jump? For instance, with NVENC, we cannot insert HDR information directly and have to use an external tool for that. This time with Pre-Analysis. There is currently a serious lack of data on compressing 4K HDR videos out there, so I took it upon myself to get learned in the ways of the x265 encoding world. But when I looked at the videos I was enjoying just fine at CRF 22, they were mostly coming out with less than a 10Mbps bitrate. Put simply, the closer the result is to 1 the better. . What is the potential range for a good CRF value? Do you think for H.265 but with 1080p and less content that all of what youve posted here would still be applicable or do you think its only for 4k content? Not bad, but we can do better! Definitely not for archiving. This information alone confirmed for me that I will only be using x265 or newer encodings (maybe AV1 in 2020) for storing videos going forward. Nothing to do specifically with libx265 included with ffmpeg See. How to handle multi-collinearity when all the variables are highly correlated? Think of video format as a container that defines file structure for carrying video and audio streams. I have always read to use Constant Rate Factor over Average BitRate for stored video files (and especially over Constant Quality). In fact, the MPV devs have mentioned this repeatedly, don't rely on hardware-accelerated decoding for mission-critical content delivery. At what point of what we watch as the MCU movies the branching started? For example, with constant bit-rate encoding, you can specify -rc:v cbr (which is significantly faster than the cbr_ld_hq rate control method, bringing an additional ~20% boost to throughput). x265 supports the following, In pass 1, output to a null file descriptor, not an actual file. Theoretically Correct vs Practical Notation. Modern web development every year applies new standards for performance. Even though it does cost double the time of medium it really delivers in the quality department. The best answers are voted up and rise to the top, Not the answer you're looking for? There is no such thing as "proper bitrate". 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? (if you go higher than 4.1 preset). Thank you very much. Libvorbis for audio seems slow. I've gone through this sub and tried to improve my transcodes, but I'm still not 100% there. -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. Hey Jamie, sure thing!
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