theX.265 (a free HEVC) codec. Have you ever tried that HEVC encoder? (HELP)

[poisondeathray]

Yes , it's not working in ffmpeg libx264. I would stick with x264cli if you want to do open gop tests

[poisondeathray]

ok nevermind, this switch works :

-x264-params open-gop=1

[roa]

I am using -vcodec h264 and as you said, -x264opts open-gop works fine for me. I don't know what is the difference between h264 and libx264 ffmpeg. I noticed I can use both...

[poisondeathray]

I am using -vcodec h264 and as you said, -x264opts open-gop works fine for me. I don't know what is the difference between h264 and libx264 ffmpeg. I noticed I can use both...

-vcodec libx264 -x264opts open-gop => does not work . It encodes, but the command isn't actually passed in the encode

I don't know what difference is between -vcodec h264 and libx264 in ffmpeg, I've always used libx264 for ffmpeg

[poisondeathray]

ok, -vcodec h264 calls libx264 as well, and -x264opts open-gop encodes, but command isn't passed through (still closed)

so use this
-x264-params open-gop=1

[roa]

Hello,
I tested HEVC and H.264 but I do not obtain satisfying results.
I would want to know if I did not configured HEVC properly, or it is normal to be like this.
So, lossless mode, for a Gop of size 4, input video format CIF
= > compression ratio h.264 = 42%
compression ratio HEVC = 50%
Or for lossy mode, 1bit/pixel, Gop of size 4
=> PSNR luma h.264 = 30dB
PSNR luma HEVC = 31db
In lossy mode I do not obtain a better quality compared to h.264
If you have some ideas, please help me.

[roa]

Hi,

I encoded a few frames of BigBuckBunny.yuv using HEVC and specifying a target bitrate of about 0.5bit/pixel. I noticed that the size of binary file decrease as the GOP size is larger. So, what is the role of target bitrate? Does it depends on Gop size? I was expecting to find the same final bitrate no matter the Gop configuration

thank you in advance

[verity]

Hello Everybody...

Is there anyone know the algorithm of HEVC encoder and decoder?? such as the flowchart ??

Best Regards

[Selur]

iirc https://app.box.com/s/rxxxzr1a1lnh7709yvih contained some charts,..

[verity]

Thanks a lot for your fast response.

Best Regards

[Selur]

http://iphome.hhi.de/schierl/assets/hevc_icassp2012.pdf also contains a general diagram of a HEVC decoder

[verity]

Thanks a lot for your support. I actually need it because I want to understand the HEVC encode/decoder how it works. Since I need to design a teleconference using HEVC codec, that's why I need to understand each step.

Thanks again and best regards.