I was given this file and I can't play it without disabling hardware decoding. What is H.265 profile 0? Is this file produced by broken software? Does HEVC profile 0 even exist?
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Yes, it plays in SW mode.
Code:Video ID : 1 Format : HEVC Format/Info : High Efficiency Video Coding Codec ID : V_MPEGH/ISO/HEVC Duration : 1 h 40 min Bit rate : 901 kb/s Width : 1 280 pixels Height : 720 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 23.976 (24000/1001) FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Bits/(Pixel*Frame) : 0.041 Stream size : 646 MiB (93%) Writing library : x265 1.5:[Windows][GCC 4.9.0][64 bit] Encoding settings : wpp / ctu=32 / tu-intra-depth=1 / tu-inter-depth=1 / me=1 / subme=1 / merange=57 / no-rect / no-amp / max-merge=2 / temporal-mvp / early-skip / no-fast-cbf / rdpenalty=0 / no-tskip / no-tskip-fast / strong-intra-smoothing / no-lossless / no-cu-lossless / no-constrained-intra / fast-intra / open-gop / interlace=0 / keyint=240 / min-keyint=24 / scenecut=40 / rc-lookahead=15 / bframes=4 / bframe-bias=0 / b-adapt=0 / ref=8 / weightp / no-weightb / aq-mode=1 / aq-strength=1.00 / cbqpoffs=0 / crqpoffs=0 / rd=2 / psy-rd=0.30 / psy-rdoq=0.00 / signhide / lft / sao / no-sao-non-deblock / b-pyramid / no-cutree / rc=2 / pass / bitrate=900 / qcomp=0.60 / qpmin=0 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ipratio=1.40 / pbratio=1.30 Default : Yes Forced : No Color range : Limited Color primaries : BT.709 Transfer characteristics : BT.709 Matrix coefficients : BT.709
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Encoder must have set --ref 8 --allow-non-conformance (with b-pyramid) creating a stream exceeding HEVC specifications.
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OK, is there anything that can be done to "fix" such a file? Below is VA-API info of my box.
Code:~ $ vainfo libva info: VA-API version 0.40.0 libva info: va_getDriverName() returns 0 libva info: Trying to open /usr/lib64/va/drivers/i965_drv_video.so libva info: Found init function __vaDriverInit_0_40 libva info: va_openDriver() returns 0 vainfo: VA-API version: 0.40 (libva ) vainfo: Driver version: Intel i965 driver for Intel(R) Skylake - 1.8.3 vainfo: Supported profile and entrypoints VAProfileMPEG2Simple : VAEntrypointVLD VAProfileMPEG2Simple : VAEntrypointEncSlice VAProfileMPEG2Main : VAEntrypointVLD VAProfileMPEG2Main : VAEntrypointEncSlice VAProfileH264ConstrainedBaseline: VAEntrypointVLD VAProfileH264ConstrainedBaseline: VAEntrypointEncSlice VAProfileH264ConstrainedBaseline: VAEntrypointEncSliceLP VAProfileH264Main : VAEntrypointVLD VAProfileH264Main : VAEntrypointEncSlice VAProfileH264Main : VAEntrypointEncSliceLP VAProfileH264High : VAEntrypointVLD VAProfileH264High : VAEntrypointEncSlice VAProfileH264High : VAEntrypointEncSliceLP VAProfileH264MultiviewHigh : VAEntrypointVLD VAProfileH264MultiviewHigh : VAEntrypointEncSlice VAProfileH264StereoHigh : VAEntrypointVLD VAProfileH264StereoHigh : VAEntrypointEncSlice VAProfileVC1Simple : VAEntrypointVLD VAProfileVC1Main : VAEntrypointVLD VAProfileVC1Advanced : VAEntrypointVLD VAProfileNone : VAEntrypointVideoProc VAProfileJPEGBaseline : VAEntrypointVLD VAProfileJPEGBaseline : VAEntrypointEncPicture VAProfileVP8Version0_3 : VAEntrypointVLD VAProfileVP8Version0_3 : VAEntrypointEncSlice VAProfileHEVCMain : VAEntrypointVLD VAProfileHEVCMain : VAEntrypointEncSlice
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Ask the developer of your playback software if there is a way to force hardware decoding of such streams. Or try to manipulate the stream's flags to signal specified level (and DPB?). Either way there is a chance decoding will be erroneous.
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Manipulate flags, sounds interesting, how? Sure it could be done with a hex editor if the address is known, but is there an easier way?
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I haven't seen any software to manipulate those level and profile flags in HEVC.
Maybe there is trick: encode a very short spec compliant stream with same parameters (except lower ref count) and append your problem stream to it. If your player starts in hardware decoding mode maybe it stays in hardware decoding mode?
But is it worth it? Is HEVC 720p too much work for your CPU? And again: we don't know if it will work. Just don't encode such bad streams...
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