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13th August 2013, 17:51 | #202 | Link |
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Hi,
I made some tests for HEVC HM 9.0 and h.264 (ffmpeg). For a video in CIF format, with a Gop size of 4, in lossy mode - 1bit/pixel I got the following results: => PSNR luma for h.264 = 30 dB => PSNR luma for HEVC = 31 dB Does anyone have any idea? I think I should obtain much more better results with HEVC. Thank you in advance |
13th August 2013, 18:27 | #203 | Link | |
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Quote:
PSNR values will depend on the bit rate for each encoder, as well as the settings for all of the many decisions that encoders must make (run fast, or take your time and find the best possible result). PSNR values alone are meaningless. We have to look at PSNR vs bit rate, and at the same time, PSNR vs encoding speed. Of course, experts will also tell you that PSNR isn't the best measure of visual quality (and they're right)... but that's another topic. By the way... we've posted a new Evaluator's Guide on the x265 repository... https://bitbucket.org/multicoreware/x265/downloads/x265%20Evaluators%20Guide%2008-12-13.pdf Tom MulticoreWare |
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15th August 2013, 18:58 | #205 | Link |
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x265+src.zip version 0.3+355-23d8d29c5242 (rev 3512)
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16th August 2013, 12:46 | #206 | Link | |
Testeur de codecs
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Quote:
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Le Sagittaire ... ;-) 1- Ateme AVC or x264 2- VP7 or RV10 only for anime 3- XviD, DivX or WMV9 |
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16th August 2013, 13:01 | #208 | Link |
German doom9/Gleitz SuMo
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Maybe MediaFire has less annoying and confusing ads. (Hope you don't mind the mirror, MasterNobody.)
__ P.S.: Did I miss them already being available, or are AviSynth compatible decoders (e.g. LAV / L-SMASH) "planned soon™"? Last edited by LigH; 16th August 2013 at 13:07. |
16th August 2013, 13:42 | #209 | Link |
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ffmpeg/Libav have a decoder in the works, which still needs a lot of cleanup, but is otherwise functional .. it may appear somewhat "soon" in the source tree, an exact time plan is impossible to say of course.
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LAV Filters - open source ffmpeg based media splitter and decoders |
16th August 2013, 13:45 | #210 | Link |
German doom9/Gleitz SuMo
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Well, x265 can read raw YUV or Y4M only still, so testers will get used to its handling rather soon.
What are currently recommended filename extensions for the raw H.265/HEVC output? |
16th August 2013, 15:30 | #212 | Link |
German doom9/Gleitz SuMo
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The MP4Box in GPAC 0.5.1 Nightly Builds multiplexes HEVC into MP4. I just tested the Sintel trailer which took ~1:23h with defaults.
Code:
x265.exe sintel_trailer_1080.y4m -o sintel_trailer_1080.hevc mp4box.exe -add sintel_trailer_1080.hevc#trackID=1:fps=24.0 -new sintel_trailer_1080_hevc.mp4 The default quantization of x265 (QP = 32) is too coarse. My result had ~360 kbps which is too little for FullHD; yet, it had a few surprisingly sharp details. Last edited by LigH; 16th August 2013 at 15:33. |
16th August 2013, 15:40 | #213 | Link |
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Yes I know that GPAC can mux hevc in mp4 and there is also a Divx muxer for mkv and xhevc muxer for flv, but no real standard, if I remember correctly JEEB said that the HEVC file format is under certification procedure and the final draft is not available yet.
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16th August 2013, 21:27 | #214 | Link | ||
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Quote:
I haven't tested it, but maybe their decoder could be more optimized. Quote:
I imagine all the fades in the Sintel trailer would also benefit from turning on weighted prediction too, and all this is currently quite unoptimized and slow. |
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17th August 2013, 13:38 | #215 | Link | |
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20th August 2013, 07:40 | #216 | Link |
German doom9/Gleitz SuMo
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23rd August 2013, 00:31 | #217 | Link | |
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23rd August 2013, 16:03 | #220 | Link |
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If you have an encoded bitstream that can't be decoded perfectly by a particular decoder, and you are wondering whether the encoded stream is compliant with the HEVC specifications or not, I suggest that you use the HM reference decoder to decode to YUV, then use YUVplayer to examine the decoded frames. This will answer your question (is it the encoder, or the decoder that is not working properly?) Of course, uncompressed YUV video requires a lot of storage space, so be sure that you limit the number of frames you are decoding.
Tom |
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