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how to encode h265 in lookahead bitrate mode?


when encoding H264 video, the lookahead rate control method can improve the encoding quality . So I want to encode h265 video file in lookahead mode too.
I don't know how to use the LA mode for h265 encoding. I think the la_ext is the implementation for h265 LA mode., so my command line is :
./sample_multi_transcode -i::h265 input.265 -o::h265 out.hevc -b 3000 -w 1920 -h 1080 -u 4 -lad 100 -la_ext

The result is:

Multi Transcoding Sample Version 8.4.27.

libva info: VA-API version 1.0.0
libva info: va_getDriverName() returns 0
libva info: User requested driver 'iHD'
libva info: Trying to open /opt/intel/mediasdk/lib64/
libva info: Found init function __vaDriverInit_1_0
libva info: va_openDriver() returns 0
Session 0:
plugin_loader.h :185 [INFO] Plugin was loaded from GUID: { 0x58, 0x8f, 0x11, 0x85, 0xd4, 0x7b, 0x42, 0x96, 0x8d, 0xea, 0x37, 0x7b, 0xb5, 0xd0, 0xdc, 0xb4 } (Intel (R) Media SDK plugin for LA ENC)

[ERROR], sts=MFX_ERR_UNSUPPORTED(-3), EncodePreInit, m_pmfxENC->Query failed at /home/lpb/git_hub/MediaSDK/samples/sample_multi_transcode/src/pipeline_transcode.cpp:461

[ERROR], sts=MFX_ERR_UNSUPPORTED(-3), Init, EncodePreInit failed at /home/lpb/git_hub/MediaSDK/samples/sample_multi_transcode/src/pipeline_transcode.cpp:3721

[ERROR], sts=MFX_ERR_UNSUPPORTED(-3), Init, pThreadPipeline->pPipeline->Init failed at /home/lpb/git_hub/MediaSDK/samples/sample_multi_transcode/src/sample_multi_transcode.cpp:442
plugin_loader.h :211 [INFO] MFXBaseUSER_UnLoad(session=0x0x56331c850c50), sts=0

[ERROR], sts=MFX_ERR_UNSUPPORTED(-3), main, transcode.Init failed at /home/lpb/git_hub/MediaSDK/samples/sample_multi_transcode/src/sample_multi_transcode.cpp:1169

My CPU is i7-6700HQ. API version is 1.28. Libva version is 1.0
So how to encode h265 in lookahead mode? And whether my CPU and the driver version support the h265 LA mode?

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1 Reply

Hi XueLou,

It looks like you were failed on the plugin loading. Are you trying to use external LA or the default LA?

This error line explained:

plugin_loader.h :211 [INFO] MFXBaseUSER_UnLoad(session=0x0x56331c850c50), sts=0

This is the actual code:

The document didn't say support HEVC by default but I believe you could pass this error if you use H.264 and without "-la_ext" argument, then try to use HEVC without "-la_ext"

If still not working, please use command "strace ./sample_multi_transcode -i::h265 input.265 -o::h265 out.hevc -b 3000 -w 1920 -h 1080 -u 4 -lad 100 -la_ext" to check why the plugin can not being loaded.


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