HDR to SDR StaxRip Problem

jay123210599 · 9th January 2026, 17:55

I am having this problem in StaxRip: https://github.com/staxrip/staxrip/issues/1891

One guy said: "Dolby Vision requires YCbCr 4:2:0 color space. Just make sure you convert the video (back) to YUV420 before you send it to x265." But how do I convert the video (back) before I send it?

Z2697 · 9th January 2026, 20:04

why you trying use dovi if convert to sdr
but yeah the upscaled chroma is not good anyway

GeoffreyA · 9th January 2026, 21:02

Is there an option in StaxRip for output pixel format?

As an alternative, you can try in FFmpeg:

Code:

ffmpeg -init_hw_device vulkan -i SOURCE.mkv -map 0:v:0 -map_metadata -1
       -vf libplacebo=w=-1:h=1080:upscaler=spline36:downscaler=spline36:colorspace=bt709:color_trc=bt709:color_primaries=bt709:range=limited:format=yuv420p10le,sidedata=delete
       -c:v libx265 -preset slow -crf 18 -x265-params level-idc=41:no-sao=1:deblock=-1,-1:aq-mode=1 OUT.mp4

The x265 parameters should be tuned further but that is beyond the scope of this thread.

manolito · 10th January 2026, 17:12

Hi jay123210599,

could you upload a short cutout of your source clip, and also your desired target format and frame size? My conversion options are limited to DGHDRtoSDR for Avisynth+ (using old StaxRip 32bit version), and to zimg based scripts for FFmpeg.

Cheers
manolito

Columbo · 10th January 2026, 17:40

@jay

DGHDRtoSDR() can output 4:2:0 with fulldepth=false (default). Note it runs on Avisynth+ or Vapoursynth. It's intended for an nVidia graphics card. However, you can run it in software mode with impl="sw", but it's rather slow. Other filters like libplacebo would be faster. That should be enough to get you going using a manual approach with avisynth+/vapoursynth/x265. I cannot help with staxrip, due to my ignorance of it, and not anything against staxrip, which is a fine application.

Like Z2697 said, what are you talking about if you are going to SDR?

jay123210599 · 11th January 2026, 02:20

Quote:

Originally Posted by Z2697

why you trying use dovi if convert to sdr
but yeah the upscaled chroma is not good anyway

Dolby Vision was the HDR format for my video.

Z2697 · 11th January 2026, 05:23

Yeah. Was. W-A-S !

Columbo · 11th January 2026, 09:33

Great answer Z man. I fear the OP may still not get the point, however.

jay123210599 · 11th January 2026, 13:59

Quote:

Originally Posted by Columbo

Great answer Z man. I fear the OP may still not get the point, however.

Here's my point: How do I convert my video (back) to YUV420 before I send it to x265?

microchip8 · 11th January 2026, 14:22

Quote:

Originally Posted by jay123210599

Here's my point: How do I convert my video (back) to YUV420 before I send it to x265?

Look in StaxRip for pixel format.

For ffmpeg, see example above by GeoffreyA (the format= filter)

What did you not understand?

GeoffreyA · 11th January 2026, 14:41

Post a screenshot of the dialogue boxes. I am guessing that near to where you selected Placebo, the output pixel format will be. Perhaps it's set to YUV444. Then, set DV to None.

jay123210599 · 11th January 2026, 16:02

@microchip8 @GeoffreyA

Here's my dialogue boxes: https://imgbox.com/BL44UHX3 https://imgbox.com/qdtQrWUZ

microchip8 · 11th January 2026, 16:41

Your input is already YUV420! There is no conversion needed.

jay123210599 · 11th January 2026, 17:46

All right, but now I have this error.

Code:

vpy  [INFO]: using external VapourSynth library from: "C:\Users\Jalen\Documents\StaxRip\Apps\FrameServer\VapourSynth\VSScript.dll" 
vpy  [INFO]: VapourSynth Core R73
Allocation of size  252K failed: VK_ERROR_OUT_OF_DEVICE_MEMORY!
Memory heaps supported by device:
    0: flags 0x1 size   23G
    1: flags 0x0 size   15G
    2: flags 0x1 size  214M
Memory pool 0:
    Compatible types: 0x3
    Optimal flags: 0x1
    Slab  0:        8 x   15M:   24M used   47M res   63M alloc from heap 0, efficiency 50.98%  [../subprojects/libplacebo/src/utils/upload.c:239]
    Pool summary:   24M used   47M res   63M alloc, efficiency 50.98%, utilization 75.00%
Memory pool 1:
    Compatible types: 0xffffffff
    Optimal flags: 0x3
    Buffer flags: 0x3
    Slab  0:        8 x   15M:   22M used   45M res   60M alloc from heap 0, efficiency 50.00%  [../subprojects/libplacebo/src/gpu/utils.c:576]
    Pool summary:   22M used   45M res   60M alloc, efficiency 50.00%, utilization 75.00%
Memory pool 2:
    Compatible types: 0xffffffff
    Required flags: 0x1
    Optimal flags: 0x2
    Buffer flags: 0xc3
    Pool summary:     0 used     0 res     0 alloc, efficiency 100.00%, utilization 100.00%
Memory summary:   47M used   93M res  124M alloc, efficiency 50.50%, utilization 75.00%, max page: 1520M
  Backtrace:
    #0  0x7ff81c4769ed in pl_vulkan_release_ex+0x748d (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x869ed) (0x240ac69ed)
    #1  0x7ff81c478042 in pl_vulkan_release_ex+0x8ae2 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x88042) (0x240ac8042)
    #2  0x7ff81c46ac82 in pl_vulkan_sem_create+0x1082 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x7ac82) (0x240abac82)
    #3  0x7ff81c452f01 in pl_buf_create+0x211 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x62f01) (0x240aa2f01)
    #4  0x7ff81c459618 in pl_timer_query+0x44f8 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x69618) (0x240aa9618)
    #5  0x7ff81c454ab0 in pl_pass_run+0x420 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x64ab0) (0x240aa4ab0)
    #6  0x7ff81c43dfcc in pl_find_error_diffusion_kernel+0x54c (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x4dfcc) (0x240a8dfcc)
    #7  0x7ff81c4416a7 in pl_dispatch_finish+0x747 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x516a7) (0x240a916a7)
    #8  0x7ff81c3fe222 in VapourSynthPluginInit2+0xcb92 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0xe222) (0x240a4e222)
    #9  0x7ff81c3ffea2 in VapourSynthPluginInit2+0xe812 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0xfea2) (0x240a4fea2)
    #10 0x7ff81c40a7a1 in pl_render_image+0xc1 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x1a7a1) (0x240a5a7a1)
    #11 0x7ff81c3f2937 in VapourSynthPluginInit2+0x12a7 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x2937) (0x240a42937)
    #12 0x7ff81c3f2c8f in VapourSynthPluginInit2+0x15ff (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x2c8f) (0x240a42c8f)
    #13 0x7ff81c3f3980 in VapourSynthPluginInit2+0x22f0 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x3980) (0x240a43980)
    #14 0x7ff8743c796c in getVapourSynthAPI+0xdf0c (C:\Users\Jalen\Documents\StaxRip\Apps\FrameServer\VapourSynth\Lib\site-packages\VapourSynth.dll+0x10796c) (0x18010796c)
    #15 0x7ff8743daa22 in getVapourSynthAPI+0x20fc2 (C:\Users\Jalen\Documents\StaxRip\Apps\FrameServer\VapourSynth\Lib\site-packages\VapourSynth.dll+0x11aa22) (0x18011aa22)
    #16 0x7ff8743dc2d5 in getVapourSynthAPI+0x22875 (C:\Users\Jalen\Documents\StaxRip\Apps\FrameServer\VapourSynth\Lib\site-packages\VapourSynth.dll+0x11c2d5) (0x18011c2d5)
    #17 0x7ff91dd537af in wcsrchr+0x14f (C:\WINDOWS\System32\ucrtbase.dll+0x37af) (0x1800037af)
    #18 0x7ff92051e8d6 in BaseThreadInitThunk+0x16 (C:\WINDOWS\System32\KERNEL32.DLL+0x2e8d6) (0x18002e8d6)
    #19 0x7ff920c8c53b in RtlUserThreadStart+0x2b (C:\WINDOWS\SYSTEM32\ntdll.dll+0x8c53b) (0x18008c53b)
  for malloc: ../subprojects/libplacebo/src/gpu/utils.c:1175
No slab to serve request for    96 bytes (with alignment 0xc00) in pool 2!
Failed allocating vertex buffer!
Allocation of size  252K failed: VK_ERROR_OUT_OF_DEVICE_MEMORY!
Memory heaps supported by device:
    0: flags 0x1 size   23G
    1: flags 0x0 size   15G
    2: flags 0x1 size  214M
Memory pool 0:
    Compatible types: 0x3
    Optimal flags: 0x1
    Slab  0:        8 x   15M:   24M used   47M res   63M alloc from heap 0, efficiency 50.98%  [../subprojects/libplacebo/src/utils/upload.c:239]
    Slab  1:     fffe x   16K:   16K used   16K res  256K alloc from heap 0, efficiency 100.00%  [subprojects/libplacebo/src/shaders/sampling.c:1032]
    Pool summary:   24M used   47M res   64M alloc, efficiency 51.00%, utilization 74.73%
Memory pool 1:
    Compatible types: 0xffffffff
    Optimal flags: 0x3
    Buffer flags: 0x3
    Slab  0:        8 x   15M:   22M used   45M res   60M alloc from heap 0, efficiency 50.00%  [../subprojects/libplacebo/src/gpu/utils.c:576]
    Pool summary:   22M used   45M res   60M alloc, efficiency 50.00%, utilization 75.00%
Memory pool 2:
    Compatible types: 0xffffffff
    Required flags: 0x1
    Optimal flags: 0x2
    Buffer flags: 0xc3
    Pool summary:     0 used     0 res     0 alloc, efficiency 100.00%, utilization 100.00%
Memory summary:   47M used   93M res  124M alloc, efficiency 50.51%, utilization 74.86%, max page: 1520M
  Backtrace:
    #0  0x7ff81c4769ed in pl_vulkan_release_ex+0x748d (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x869ed) (0x240ac69ed)
    #1  0x7ff81c478042 in pl_vulkan_release_ex+0x8ae2 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x88042) (0x240ac8042)
    #2  0x7ff81c46ac82 in pl_vulkan_sem_create+0x1082 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x7ac82) (0x240abac82)
    #3  0x7ff81c452f01 in pl_buf_create+0x211 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x62f01) (0x240aa2f01)
    #4  0x7ff81c457588 in pl_timer_query+0x2468 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x67588) (0x240aa7588)
    #5  0x7ff81c46d8ea in pl_vulkan_sem_create+0x3cea (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x7d8ea) (0x240abd8ea)
    #6  0x7ff81c452b4c in pl_tex_upload+0x7c (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x62b4c) (0x240aa2b4c)
    #7  0x7ff81c46ee30 in pl_vulkan_wrap+0x1350 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x7ee30) (0x240abee30)
    #8  0x7ff81c42a6eb in pl_lut_parse_cube+0x247b (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x3a6eb) (0x240a7a6eb)
    #9  0x7ff81c42f87d in pl_shader_sample_ortho2+0x32d (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x3f87d) (0x240a7f87d)
    #10 0x7ff81c3ff3b1 in VapourSynthPluginInit2+0xdd21 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0xf3b1) (0x240a4f3b1)
    #11 0x7ff81c400adb in VapourSynthPluginInit2+0xf44b (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x10adb) (0x240a50adb)
    #12 0x7ff81c40a7a1 in pl_render_image+0xc1 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x1a7a1) (0x240a5a7a1)
    #13 0x7ff81c3f2937 in VapourSynthPluginInit2+0x12a7 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x2937) (0x240a42937)
    #14 0x7ff81c3f2c8f in VapourSynthPluginInit2+0x15ff (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x2c8f) (0x240a42c8f)
    #15 0x7ff81c3f3980 in VapourSynthPluginInit2+0x22f0 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x3980) (0x240a43980)
    #16 0x7ff8743c796c in getVapourSynthAPI+0xdf0c (C:\Users\Jalen\Documents\StaxRip\Apps\FrameServer\VapourSynth\Lib\site-packages\VapourSynth.dll+0x10796c) (0x18010796c)
    #17 0x7ff8743daa22 in getVapourSynthAPI+0x20fc2 (C:\Users\Jalen\Documents\StaxRip\Apps\FrameServer\VapourSynth\Lib\site-packages\VapourSynth.dll+0x11aa22) (0x18011aa22)
    #18 0x7ff8743dc2d5 in getVapourSynthAPI+0x22875 (C:\Users\Jalen\Documents\StaxRip\Apps\FrameServer\VapourSynth\Lib\site-packages\VapourSynth.dll+0x11c2d5) (0x18011c2d5)
    #19 0x7ff91dd537af in wcsrchr+0x14f (C:\WINDOWS\System32\ucrtbase.dll+0x37af) (0x1800037af)
    #20 0x7ff92051e8d6 in BaseThreadInitThunk+0x16 (C:\WINDOWS\System32\KERNEL32.DLL+0x2e8d6) (0x18002e8d6)
    #21 0x7ff920c8c53b in RtlUserThreadStart+0x2b (C:\WINDOWS\SYSTEM32\ntdll.dll+0x8c53b) (0x18008c53b)
  for malloc: ../subprojects/libplacebo/src/gpu/utils.c:576
No slab to serve request for  8192 bytes (with alignment 0xc00) in pool 1!
Failed creating LUT texture!
Failed initializing separated LUT!
Failed dispatching scaler.. disabling
Allocation of size  252K failed: VK_ERROR_OUT_OF_DEVICE_MEMORY!
Memory heaps supported by device:
    0: flags 0x1 size   23G
    1: flags 0x0 size   15G
    2: flags 0x1 size  214M
Memory pool 0:
    Compatible types: 0x3
    Optimal flags: 0x1
    Slab  0:        8 x   15M:   24M used   47M res   63M alloc from heap 0, efficiency 50.98%  [../subprojects/libplacebo/src/utils/upload.c:239]
    Slab  1:     fffe x   16K:  8192 used   16K res  256K alloc from heap 0, efficiency 50.00%  [subprojects/libplacebo/src/shaders/colorspace.c:1857]
    Pool summary:   24M used   47M res   64M alloc, efficiency 50.98%, utilization 74.73%
Memory pool 1:
    Compatible types: 0xffffffff
    Optimal flags: 0x3
    Buffer flags: 0x3
    Slab  0:        8 x   15M:   22M used   45M res   60M alloc from heap 0, efficiency 50.00%  [../subprojects/libplacebo/src/gpu/utils.c:576]
    Pool summary:   22M used   45M res   60M alloc, efficiency 50.00%, utilization 75.00%
Memory pool 2:
    Compatible types: 0xffffffff
    Required flags: 0x1
    Optimal flags: 0x2
    Buffer flags: 0xc3
    Pool summary:     0 used     0 res     0 alloc, efficiency 100.00%, utilization 100.00%
Memory summary:   47M used   93M res  124M alloc, efficiency 50.50%, utilization 74.86%, max page: 1520M
  Backtrace:
    #0  0x7ff81c4769ed in pl_vulkan_release_ex+0x748d (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x869ed) (0x240ac69ed)
    #1  0x7ff81c478042 in pl_vulkan_release_ex+0x8ae2 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x88042) (0x240ac8042)
    #2  0x7ff81c46ac82 in pl_vulkan_sem_create+0x1082 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x7ac82) (0x240abac82)
    #3  0x7ff81c452f01 in pl_buf_create+0x211 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x62f01) (0x240aa2f01)
    #4  0x7ff81c457588 in pl_timer_query+0x2468 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x67588) (0x240aa7588)
    #5  0x7ff81c46d8ea in pl_vulkan_sem_create+0x3cea (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x7d8ea) (0x240abd8ea)
    #6  0x7ff81c452b4c in pl_tex_upload+0x7c (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x62b4c) (0x240aa2b4c)
    #7  0x7ff81c429817 in pl_lut_parse_cube+0x15a7 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x39817) (0x240a79817)
    #8  0x7ff81c4169e3 in pl_shader_color_map_ex+0x2013 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x269e3) (0x240a669e3)
    #9  0x7ff81c4033b0 in VapourSynthPluginInit2+0x11d20 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x133b0) (0x240a533b0)
    #10 0x7ff81c40a813 in pl_render_image+0x133 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x1a813) (0x240a5a813)
    #11 0x7ff81c3f2937 in VapourSynthPluginInit2+0x12a7 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x2937) (0x240a42937)
    #12 0x7ff81c3f2c8f in VapourSynthPluginInit2+0x15ff (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x2c8f) (0x240a42c8f)
    #13 0x7ff81c3f3980 in VapourSynthPluginInit2+0x22f0 (C:\Users\Jalen\Documents\StaxRip\Apps\Plugins\VS\libvs_placebo\libvs_placebo.dll+0x3980) (0x240a43980)
    #14 0x7ff8743c796c in getVapourSynthAPI+0xdf0c (C:\Users\Jalen\Documents\StaxRip\Apps\FrameServer\VapourSynth\Lib\site-packages\VapourSynth.dll+0x10796c) (0x18010796c)
    #15 0x7ff8743daa22 in getVapourSynthAPI+0x20fc2 (C:\Users\Jalen\Documents\StaxRip\Apps\FrameServer\VapourSynth\Lib\site-packages\VapourSynth.dll+0x11aa22) (0x18011aa22)
    #16 0x7ff8743dc2d5 in getVapourSynthAPI+0x22875 (C:\Users\Jalen\Documents\StaxRip\Apps\FrameServer\VapourSynth\Lib\site-packages\VapourSynth.dll+0x11c2d5) (0x18011c2d5)
    #17 0x7ff91dd537af in wcsrchr+0x14f (C:\WINDOWS\System32\ucrtbase.dll+0x37af) (0x1800037af)
    #18 0x7ff92051e8d6 in BaseThreadInitThunk+0x16 (C:\WINDOWS\System32\KERNEL32.DLL+0x2e8d6) (0x18002e8d6)
    #19 0x7ff920c8c53b in RtlUserThreadStart+0x2b (C:\WINDOWS\SYSTEM32\ntdll.dll+0x8c53b) (0x18008c53b)
  for malloc: ../subprojects/libplacebo/src/gpu/utils.c:576
No slab to serve request for  1024 bytes (with alignment 0xc00) in pool 1!
Failed creating LUT texture!
Failed generating tone-mapping LUT!
Attempting to modify a failed shader!
Trying to dispatch a failed shader.
Failed rendering image!
vpy  [WARN]: Failed processing planes!
vpy  [INFO]: 3840x2076 fps 24000/1001 i444p16 frames 0 - 76 of 77
vpy  [INFO]: using 12 parallel requests
raw  [INFO]: output file: C:\Users\Jalen\Desktop\New folder (2)\The SpongeBob SquarePants Movie (2004) (2160p BluRay x265 HEVC 10bit HDR DV EAC3 5.1 KLRK)-00.31.57.19-00.32.01.16.mkv_temp\The SpongeBob SquarePants Movie (2004) (2160p BluRay x265 HEVC 10bit HDR DV EAC3 5.1 KLRK)-00.31.57.19-00.32.01.16_new_out.hevc
x265 [INFO]: HEVC encoder version 4.1+212+35-87f5a69a8 [Mod by Patman]
x265 [INFO]: build info [Windows][Clang 21.1.7][64 bit] 10bit
x265 [INFO]: using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
x265 [FLAW]: Dolby Vision profile - 5, profile - 8.1, profile - 8.2 and profile - 8.4 requires YCbCr 4:2:0 color space
x265 [FLAW]: x265_encoder_open() failed for Enc, 
Allocation of size  252K failed: VK_ERROR_OUT_OF_DEVICE_MEMORY!

GeoffreyA · Yesterday, 19:36

Could be a driver issue. On my Arc B580, libplacebo does not work through VapourSynth. If I remember correctly, you've got an Nvidia card. I would consider using FFmpeg, which is simpler.

Z2697 · Today, 05:47

On the 444 regard, vsplacebo tonemap ONLY outputs RGB48 or YUV444P16, depending on input color family.
(The reason I said "upscaled chroma")

Pixel format conversion is covered by core.resize
plug it in after vsplacebo

9th January 2026, 17:55	#1 \| Link
jay123210599 Registered User Join Date: Apr 2024 Posts: 481	HDR to SDR StaxRip Problem I am having this problem in StaxRip: https://github.com/staxrip/staxrip/issues/1891 One guy said: "Dolby Vision requires YCbCr 4:2:0 color space. Just make sure you convert the video (back) to YUV420 before you send it to x265." But how do I convert the video (back) before I send it?

9th January 2026, 21:02	#3 \| Link
GeoffreyA Registered User Join Date: Jun 2024 Location: South Africa Posts: 603	Is there an option in StaxRip for output pixel format? As an alternative, you can try in FFmpeg: Code: ffmpeg -init_hw_device vulkan -i SOURCE.mkv -map 0:v:0 -map_metadata -1 -vf libplacebo=w=-1:h=1080:upscaler=spline36:downscaler=spline36:colorspace=bt709:color_trc=bt709:color_primaries=bt709:range=limited:format=yuv420p10le,sidedata=delete -c:v libx265 -preset slow -crf 18 -x265-params level-idc=41:no-sao=1:deblock=-1,-1:aq-mode=1 OUT.mp4 The x265 parameters should be tuned further but that is beyond the scope of this thread. Last edited by GeoffreyA; 10th January 2026 at 09:22.

10th January 2026, 17:40	#5 \| Link
Columbo Registered User Join Date: Sep 2025 Posts: 90	@jay DGHDRtoSDR() can output 4:2:0 with fulldepth=false (default). Note it runs on Avisynth+ or Vapoursynth. It's intended for an nVidia graphics card. However, you can run it in software mode with impl="sw", but it's rather slow. Other filters like libplacebo would be faster. That should be enough to get you going using a manual approach with avisynth+/vapoursynth/x265. I cannot help with staxrip, due to my ignorance of it, and not anything against staxrip, which is a fine application. Like Z2697 said, what are you talking about if you are going to SDR? Last edited by Columbo; 10th January 2026 at 18:01.

11th January 2026, 14:41	#11 \| Link
GeoffreyA Registered User Join Date: Jun 2024 Location: South Africa Posts: 603	Post a screenshot of the dialogue boxes. I am guessing that near to where you selected Placebo, the output pixel format will be. Perhaps it's set to YUV444. Then, set DV to None. Last edited by GeoffreyA; 11th January 2026 at 14:47.

11th January 2026, 16:41	#13 \| Link
microchip8 ffx264/ffhevc author Join Date: May 2007 Location: /dev/video0 Posts: 2,017	Your input is already YUV420! There is no conversion needed. __________________ The Cyberpunk Database \|\| NTP & NTS Time Server \|\| Mirror Services ffhevc \|\| ffx264 \|\| ffxvid

9th January 2026, 20:04	#2 \| Link
Z2697 Registered User Join Date: Aug 2024 Location: Between my two ears Posts: 858	why you trying use dovi if convert to sdr but yeah the upscaled chroma is not good anyway

10th January 2026, 17:12	#4 \| Link
manolito Registered User Join Date: Sep 2003 Location: Berlin, Germany Posts: 3,134	Hi jay123210599, could you upload a short cutout of your source clip, and also your desired target format and frame size? My conversion options are limited to DGHDRtoSDR for Avisynth+ (using old StaxRip 32bit version), and to zimg based scripts for FFmpeg. Cheers manolito

11th January 2026, 05:23	#7 \| Link
Z2697 Registered User Join Date: Aug 2024 Location: Between my two ears Posts: 858	Yeah. Was. W-A-S !

11th January 2026, 09:33	#8 \| Link
Columbo Registered User Join Date: Sep 2025 Posts: 90	Great answer Z man. I fear the OP may still not get the point, however.

11th January 2026, 16:02	#12 \| Link
jay123210599 Registered User Join Date: Apr 2024 Posts: 481	@microchip8 @GeoffreyA Here's my dialogue boxes: https://imgbox.com/BL44UHX3 https://imgbox.com/qdtQrWUZ

Yesterday, 19:36	#15 \| Link
GeoffreyA Registered User Join Date: Jun 2024 Location: South Africa Posts: 603	Could be a driver issue. On my Arc B580, libplacebo does not work through VapourSynth. If I remember correctly, you've got an Nvidia card. I would consider using FFmpeg, which is simpler. Last edited by GeoffreyA; Yesterday at 19:40.

Today, 05:47	#16 \| Link
Z2697 Registered User Join Date: Aug 2024 Location: Between my two ears Posts: 858	On the 444 regard, vsplacebo tonemap ONLY outputs RGB48 or YUV444P16, depending on input color family. (The reason I said "upscaled chroma") Pixel format conversion is covered by core.resize plug it in after vsplacebo

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