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h265 lossless CHARACTERISTICS

Lossless — x265 documentation

Lossless Encoding¶. x265 can encode HEVC bitstreams that are entirely lossless (the reconstructed images are bit-exact to the source images) by using the --lossless option. Lossless operation is theoretically simple. Rate control, by definition, is disabled and the encoder disables all quality metrics since they would only waste CPU cycles.

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Nvidia h.265 hevc lossless - VideoHelp Forum

Jan 24, 2018 · Lossless compression is the opposite of "max. compression"; efficient compression is achieved by allowing a certain degree of loss. The compression ratio of lossless algorithms can't be tuned for a great range of speed vs. efficiency; if there are at all any options to change the behaviour, variation in results will be small.

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ffmpeg - Re-encoding video library in x265 (HEVC) with no ...

@TheBitByte I don't think there is a lossless compression level in h265. For the compression-less option, it's just --lossless . I searched in vain for a lossless conversion from h264 to h265, and what I've learned tells me it's mathematically impossible.

From my own experience, if you want absolutely no loss in quality, --lossless is what you are looking for. Not sure about avconv but the command you typed looks identical to what I do with FFmpeg . In FFmpeg you can pass the parameter like this ffmpeg -i INPUT.mkv -c:v libx265 -preset ultrafast -x265-params lossless=1 OUTPUT.mkv Most x265 switches (options with no value) can be specified like this (except those CLI-only ones, those are only used with x265 binary directly). With that out of the way, I'd like to share my experience with x265 encoding. For most videos (be it WMV, or MPEG, or AVC/H.264) I use crf=23 . x265 decides the rest of the parameters and usually it does a good enough job. However often before I commit to transcoding a video in its entirety, I test my settings by converting a small portion of the video in question. Here's an example, suppose an mkv file with stream 0 being video, stream 1 being DTS audio, and stream 2 being a subtitle ffmpeg -hide_banner \-ss 0 \-i "INPUT.mkv" \-attach "COVER.jpg" \-map_metadata 0 \-map_chapters 0 \-metadata title="TITLE" \-map 0:0 -metadata:s:v:0 language=eng \-map 0:1 -metadata:s:a:0 language=eng -metadata:s:a:0 title="Surround 5.1 (DTS)" \-map 0:2 -metadata:s:s:0 language=eng -metadata:s:s:0 title="English" \-metadata:s:t:0 filename="Cover.jpg" -metadata:s:t:0 mimetype="image/jpeg" \-c:v libx265 -preset ultrafast -x265-params \crf=22:qcomp=0.8:aq-mode=1:aq_strength=1.0:qg-size=16:psy-rd=0.7:psy-rdoq=5.0:rdoq-level=1:merange=44 \-c:a copy \-c:s copy \-t 120 \"OUTPUT.HEVC.DTS.Sample.mkv" Note that the backslashes signal line breaks in a long command, I do it to help me keep track of various bits of a complex CLI input. Before I explain it line-by-line, the part where you convert only a small portion of a video is the second line and the second last line -ss 0 means seek to 0 second before starts decoding the input, and -t 120 means stop writing to the output after 120 seconds. You can also use hh:mm:ss or hh:mm:ss.sss time formats. Now line-by-line -hide_banner prevents FFmpeg from showing build information on start. I just don' want to see it when I scroll up in the console; -ss 0 seeks to 0 second before start decoding the input. Note that if this parameter is given after the input file and before the output file, it becomes an output option and tells ffmpeg to decode and ignore the input until x seconds, and then start writing to output. As an input option it is less accurate (because seeking is not accurate in most container formats), but takes almost no time. As an output option it is very precise but takes a considerable amount of time to decode all the stream before the specified time, and for testing purpose you don't want to waste time; -i "INPUT.mkv" Specify the input file; -attach "COVER.jpg" Attach a cover art (thumbnail picture, poster, whatever) to the output. The cover art is usually shown in file explorers; -map_metadata 0 Copy over any and all metadata from input 0, which in the example is just the input; -map_chapters 0 Copy over chapter info (if present) from input 0; -metadata title="TITLE" Set the title of the video; -map 0:0 ... Map stream 0 of input 0, which means we want the first stream from the input to be written to the output. Since this stream is a video stream, it is the first video stream in the output , hence the stream specifier :s:v:0 . Set its language tag to English; -map 0:1 ... Similar to line 8, map the second stream (DTS audio), and set its language and title (for easier identification when choosing from players); -map 0:2 ... Similar to line 9, except this stream is a subtitle; -metadata:s:t:0 ... Set metadata for the cover art. This is required for mkv container format; -c:v libx265 ... Video codec options. It's so long that I've broken it into two lines. This setting is good for high quality bluray video (1080p) with minimal banding in gradient (which x265 sucks at). It is most likely an overkill for DVDs and TV shows and phone videos. This setting is mostly stolen from this Doom9 post ; crf=22:... Continuation of video codec parameters. See the forum post mentioned above; -c:a copy Copy over audio; -c:s copy Copy over subtitles; -t 120 Stop writing to the output after 120 seconds, which gives us a 2-minute clip for previewing trancoding quality; "OUTPUT.HEVC.DTS.Sample.mkv" Output file name. I tag my file names with the video codec and the primary audio codec. Whew. This is my first answer so if there is anything I missed please leave a comment. I'm not a video production expert, I'm just a guy who's too lazy to watch a movie by putting the disc into the player. PS. Maybe this question belongs to somewhere else as it isn't strongly related to Unix & Linux.52I've recently gone through the trouble of Transcoding my whole video catalog over to HEVC. I use https://github/FallingSnow/h265ize with the following settings. h265ize -v -m medium -q 20 -x --no-sao --aq-mode 3 --delete --stats -v - Verbose Output -m medium - Medium encode speed (smaller higher quality, anything slower I find is not worth the time/quality dif) -q 20 - the CRF used, 20 is similar to 18 or so in x264 but hey. This is for 1080p content (90% of my TV) I tend to use 22 for my 4K movies -x - Use x265 central defined commands --no-sao turns off Sample Adaptive Offset (improves speed of encode) --aq-mode 3 - use Adaptive Quantisation with auto variance, helps 8bit encodes, especially in dark areas, stops most of the banding that can happen (at expense of encode time though) --delete - replace encoding file with encoded file (test before using this one) --stats - Write stats out to a csv file in the root of the path you ran from. Encode speeds are around 30fps (for most 1080p stuff) on my rig. Dual Xeon E5 2687W v2, but I force the FFMPEG process to not use the first side of one of the processors (It's my Plex server, so have to make sure there's overhead for transcode if needed on playback etc) Yes it took a while to convert most of it over, and now I have a scheduled task that runs twice a day to encode the stuff from that day over to x265. The space savings have been enormous. My initial SAN was at 20Tb use, now it's around 12 but obviously has been added too with 6 months more content. I've started to transcode all my Movies over too, however, that's an ongoing process, as I have to ID quality levels (Radarr fortunately labels then nicely) and use one of three transcode settings -m slower -q 18 -x --no-sao --aq-mode 3 for 720p transcodes -m medium -q 20 -x --no-sao --aq-mode 3 for 1080p -m medium -q 22 -x --no-sao for 2160p Hope that helps some people. Shout if anyone needs a hand setting it all up. And before you encode everything to x265, think about playback, if the client doesn't support x265 native, then the transcade can be expensive in terms of CPU and Quality.7The correct syntax to enable lossless mode for x265 encoder in ffmpeg is -x265-params lossless=1 (you need to append =1 ). However, for lossless coding there are better codec choices. I found by testing that FFV1 compresses vastly better (file size = ~80% of x265) at least on some kinds of video (if best settings are chosen for both codecs). And it also works faster, and (AFAIK) is not encumbered by patents. That is, it's superior to lossless H.265 in every way for video archiving.3

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How to correctly use x265 lossless parameter with avconv

x265 has a lossless mode which is used for ultra-high bitrates with zero loss of quality. I tried using this mode with avconv as follows However, using this mode has an opposite effect video came out to be of extremely low quality. It was totally lossy!!

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AV1 vs VP9 vs AVC (h.264) vs HEVC (h.265) Part I - Lossless

Decoders for H.264, H265, and VP9 utilize multi-threads.We were not able to play videos encoded with AV1 in Chrome, Firefox Nightly, VLC, both on Windows and LINUX, though those are claimed to be able to.To decode the files encoded with AV1, the CPU time was approximately 3.5-6x longer than that to decode files encoded with x264.

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What Lossless File Formats Are & Why You Shouldn’t …

Audio WAV is a container file often used to contain lossless audio, although it is also capable of containing lossy audio. FLAC is a lossless audio format, while MP3 is a lossy audio format. Video Few lossless video formats are in common consumer use, as they would result in video files taking up a huge amount of space. Common formats like H.264 and H.265 are all lossy.

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h.264 - h264 lossless coding - Stack Overflow

Series of lossless bitmaps (in any colorspace) -> some transformation -> h264 encode -> h264 decode -> some transformation -> the original series of lossless bitmaps If there a way to achieve this? EDIT There is a VERY valid point about lossless H264 not making too much sense.

I am going to add a late answer to this one after spending all day trying to figure out how to get YUV 4:4:4 pixels into x264. While x264 does accept raw 4:2:0 pixels in a file, it is really quite difficult getting 4:4:4 pixels passed in. With recent versions of ffmpeg, the following works for completely lossless encoding and extraction to verify the encoding. First, write your raw yuv 4:4:4 pixels to a file in a planar format. The planes are a set of Y bytes, then the U and V bytes where U and V use 128 as the zero value. Now, invoke ffmpeg and pass in the size of the raw YUV frames as use the "yuv444p" pixel format twice, like so ffmpeg -y -s 480x480 -pix_fmt yuv444p -i Tree480.yuv \-c:v libx264 -pix_fmt yuv444p -profile:v high444 -crf 0 \-preset:v slow \Tree480_lossless.m4v Once the encoding to h264 and wrapping as a Quicktime file is done, one can extract the exact same bytes like so ffmpeg -y -i Tree480_lossless.m4v -vcodec rawvideo -pix_fmt yuv444p \Tree480_m4v_decoded.yuv Finally, verify the two binary files with diff $ diff -s Tree480.yuv Tree480_m4v_decoded.yuvFiles Tree480.yuv and Tree480_m4v_decoded.yuv are identical Just keep in mind that you need to write the YUV bytes to a file yourself, do not let ffmpeg do any conversion of the YUV values!Best answer · 21If x264 does lossless encoding but doesn't like your input format, then your best bet is to use ffmpeg to deal with the input file. Try starting with something like ffmpeg -i input.avi -f yuv4mpegpipe -pix_fmt yuv420p -y /dev/stdout \ x264 $OPTIONS -o output.264 /dev/stdin and adding options from there. YUV4MPEG is a lossless uncompressed format suitable for piping between different video tools; ffmpeg knows how to write it and x264 knows how to read it.5I don't know your requirements for compression and decompression, but a general purpose archiver (like 7-zip with LZMA2) should be able to compress about as small or, in some cases, even significantly smaller than a lossless video codec. And it is much simpler and safer than a whole video processing chain. The downside is the much slower speed, and that you have to extract before seeing it. But for images, I think you should try it. There is also lossless image formats, like .png. For encoding lossless RGB with x264, you should use the command line version of x264 (you can't trust GUIs in this edge case, they will probably mess-up) r2020 or newer, with something like that x264 --qp 0 --preset fast --input-csp rgb --output-csp rgb --colormatrix GBR --output "the_lossless_output.mkv" "someinput.avs" Any losses/differences between the input and output should be from some colour space conversion (either before encoding, or at playback), wrong settings or some header/meta-data that was lost. x264 don't supports RGBA, but RGB is ok. YUV 4:4:4 compression is more efficient, but you will lose some data in colour space conversion as your input is RGB. YV12/i420 is much smaller, and by far the most common colour space in video, but you have less chroma resolution. More information on x264 settings http://mewiki.project357/wiki/X264_Settings Also, avoid lagarith. It uses x87 floating point... and there are better alternatives. http://codecs.multimedia.cx/?p=303 http://mod16/hurfdurf/?p=142 EDIT:I don't know why I was donwvoted. Please leave a comment when you do that.3FFmpeg has a "lossless" mode for x264, see FFmpeg and x264 Encoding Guide § Lossless H.264 in essence it's -qp 03To generate lossless H.264 with HandBrake GUI, set Video Codec H.264, Constant Quality, RF 0, H.264 Profile auto. Though this file is not supported natively by Apple, it can be re-encoded as near-lossless for playback. HandBrake GUI's Activity Window H.264 Profile auto; Encoding at constant RF 0.000000 ... profile High 4:4:4 Predictive, level 3.0, 4:2:0 8-bit H.264 Profile high; Encoding at constant RF 0.000000 ... lossless requires high444 profile, disabling ... profile High , level 3.02If you can't get lossless compression using a h.264 encoder and decoder,perhaps you could look into two alternatives (1) Rather than passing all the data in h.264 format, some people are experimenting with transmitting some of the data with a residual "side channel" (h.264 file) -> h264 decode -> some transformation -> a lossy approximation of the original series of bitmaps (compressed residual file) --> decoder -> a series of lossless residual bitmaps For each pixel in each bitmap, approximate_pixel + residual_pixel = a pixel bit-for-bit equal to the original pixel. (2) Use Dirac video compression format in "lossless" mode.1I agree that sometimes the loss in data is acceptable, but it's not simply a matter of how it looks immediately after compression. Even a visually imperceptible loss of color data can degrade footage such that color correction, greenscreen keying, tracking, and other post tasks become more difficult or impossible, which add expense to a production. It really depends when and how you compress in the pipeline, but ultimately it makes sense to archive the original quality, as storage is usually far less expensive than reshooting.1This isn't exactly an answer to your question, but rather a reason why being lossy can be better than lossless. Here is a comparison of the same image but encoded differently with a lossy and lossless format. PNG (lossless) 148 kB JPEG-8 (lossy) 36 kB JPEG-10 (lossy) 65 kB JPEG-12 (lossy) 122 kB Now open up both the PNG (lossless) image and the JPEG-10 (lossy) image in two new tabs in your web browser. Flip back and forth, you can see a faint difference but barely. My point is that you would never tell the difference in quality without looking at both of them at the same time and examining them closely. Lossless data compression is not worth it in most cases because lossy formats can give you the exact quality at a lower cost (file size).ffmpeg - h264 lossless settings in c - Stack OverflowHow to get a lossless encoding with ffmpegSee more results

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What Lossless File Formats Are & Why You Shouldn’t …

Video Few lossless video formats are in common consumer use, as they would result in video files taking up a huge amount of space. Common formats like H.264 and H.265 are all lossy. Common formats like H.264 and H.265 are all lossy.

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How to correctly use x265 lossless parameter with avconv

x265 has a lossless mode which is used for ultra-high bitrates with zero loss of quality. I tried using this mode with avconv as follows However, using this mode has an opposite effect video came out to be of extremely low quality. It was totally lossy!!

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AV1 vs VP9 vs AVC (h.264) vs HEVC (h.265) Part I - Lossless

Decoders for H.264, H265, and VP9 utilize multi-threads.We were not able to play videos encoded with AV1 in Chrome, Firefox Nightly, VLC, both on Windows and LINUX, though those are claimed to be able to.To decode the files encoded with AV1, the CPU time was approximately 3.5-6x longer than that to decode files encoded with x264.

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Guide to HEVC/H.265 Encoding and Playback > Quality ...

Dec 08, 2016 · Quality Comparison. HEVC's main advantage over H.264 is that it offers roughly double the compression ratio for the same quality. This means …

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X265 "Lossless" not really lossless and I can prove it ...

Feb 03, 2017 · Using a 2.3gb 1080p source file I transcoded it to nvenc_h264 lossless (the 960 doesn't support H265 lossless) and the resulting files size was 30.9gb. The x264 ultra fast lossless was 28.6gb, with the medium preset it drops down to about 22gb.

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Best Lossless Video Codec for (4K) Video Compression

Dec 03, 2018 · Is there any lossless video codec for video compression without quality loss? Yes. H264 and HEVC (H265) are the best answers, visually lossless video codecs for compression.

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FFmpeg-users - Lossless h265/YUV420 - ffmpeg-archive

Nov 06, 2017 · Re Lossless h265/YUV420 2017-11-06 11:55 GMT+01:00 Jakob Schneider < [hidden email] > > Ah no, sorry, the problem is, that I have non-image data (vectors coordinates) > that I want to press into an image with the yuv420p pixel format That is a …

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How to get a lossless encoding with ffmpeg - libx265 ...

The command formatted like this works fine for me, thank you! Note however that qp=0 and crf=0 can be omitted, since according to x265 docs, lossless implies qp=4 ("In HEVC, only QP=4 is truly lossless quantization, and thus when encoding losslesly x265 uses QP=4 internally in its RDO decisions."), and rate control is disabled as well.

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What CRF or settings I should choose for h265 in order to ...

I have a raw footage and the quality of details of h264 with same CRF setting looks better than h265. Shouldn't be the opposite? Maybe my setup isn't the best I'm using ffmpeg for transcoding and vlc for review the videos, then i copy the screen content and compare the screens on a program like photoshop.

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LosslessCut 2.2.0 Free Download - VideoHelp

Download (mirror link) = A mirror link to the software download. It may not contain the latest versions. Download old versions = Free downloads of previous versions of the program.

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H.265 benchmarked Does the next-generation video codec ...

Jul 23, 2013 · The next-generation High Efficiency Video codec (HEVC), H.265, has hit a major public milestone thanks to the work of the developer MultiCoreWare. MCW is …

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H264 to H265 conversion PleX - reddit

Now to be entirely pedantic about all of this, you could conceivably have lossless H.264 and lossless HEVC, and convert between the two without any loss.

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H.265 to H.264 - How to Convert H.265 to H.264 Without ...

Mar 21, 2019 · Technically, H.265 goes by the name of HEVC, or High Efficiency Video Coding. As H.265's longer name implies, the video codec is designed to succeed H.264 with a more efficient encoding standard.

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How to Convert Videos from and to H.265 Files - Wondershare

How to Convert Videos from and to H.265 Files High Efficiency Video Coding (HEVC) or also called H.265 is a new video codec that compresses video files to 50% with the most proficient encoding format today, MPEG-4, or also known as the H.264.

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