Unable to show video encoded with 'rext' profile using NVIDIA' s NVENC

[GRFTSOL]

The fewer issues I have to read, the more new features I will have time to implement, so I ask that you please try these things first

• Try with a different kind of file to confirm that the problem is related to just this file.
• Try with the newest version from GitHub
• Read the documentation and FAQ, Known issues, Troubleshooting
• Search for your problem under Issues or Discussions

Steps to reproduce

Drop file to lossless-cut, video shows black.

Expected behavior

Like other .mp4 files, can be decoded/edited/output.

Actual behavior

Video playback shows black, re-encode with main/main10 profile using NVENC, playback works

Provide an error report

N/A

Share the file

File link

Share log from developer tools

-1737595744212.log

[mifi]

thanks for sharing the file. what's your OS? i've tested on macOS and here it plays back smoothly.

stream meta for future reference:

{
    "mainStreams": [
      {
        "index": 0,
        "codec_name": "hevc",
        "codec_long_name": "H.265 / HEVC (High Efficiency Video Coding)",
        "profile": "Rext",
        "codec_type": "video",
        "codec_tag_string": "hev1",
        "codec_tag": "0x31766568",
        "width": 1920,
        "height": 1080,
        "coded_width": 1920,
        "coded_height": 1088,
        "closed_captions": 0,
        "film_grain": 0,
        "has_b_frames": 1,
        "sample_aspect_ratio": "1:1",
        "display_aspect_ratio": "16:9",
        "pix_fmt": "yuv420p",
        "level": 153,
        "color_range": "tv",
        "chroma_location": "left",
        "refs": 1,
        "id": "0x1",
        "r_frame_rate": "30000/1001",
        "avg_frame_rate": "30000/1001",
        "time_base": "1/30000",
        "start_pts": 0,
        "start_time": "0.000000",
        "duration_ts": 7092085,
        "duration": "236.402833",
        "bit_rate": "1825290",
        "nb_frames": "7085",
        "extradata_size": 124,
        "disposition": {
          "default": 1,
          "dub": 0,
          "original": 0,
          "comment": 0,
          "lyrics": 0,
          "karaoke": 0,
          "forced": 0,
          "hearing_impaired": 0,
          "visual_impaired": 0,
          "clean_effects": 0,
          "attached_pic": 0,
          "timed_thumbnails": 0,
          "captions": 0,
          "descriptions": 0,
          "metadata": 0,
          "dependent": 0,
          "still_image": 0
        },
        "tags": {
          "creation_time": "2025-01-23T01:17:59.000000Z",
          "language": "und",
          "handler_name": "VideoHandler",
          "vendor_id": "[0][0][0][0]"
        }
      },
      {
        "index": 1,
        "codec_name": "opus",
        "codec_long_name": "Opus (Opus Interactive Audio Codec)",
        "codec_type": "audio",
        "codec_tag_string": "Opus",
        "codec_tag": "0x7375704f",
        "sample_fmt": "fltp",
        "sample_rate": "48000",
        "channels": 2,
        "channel_layout": "stereo",
        "bits_per_sample": 0,
        "initial_padding": 312,
        "id": "0x2",
        "r_frame_rate": "0/0",
        "avg_frame_rate": "0/0",
        "time_base": "1/48000",
        "start_pts": 0,
        "start_time": "0.000000",
        "duration_ts": 11349168,
        "duration": "236.441000",
        "bit_rate": "115706",
        "nb_frames": "11822",
        "extradata_size": 19,
        "disposition": {
          "default": 1,
          "dub": 0,
          "original": 0,
          "comment": 0,
          "lyrics": 0,
          "karaoke": 0,
          "forced": 0,
          "hearing_impaired": 0,
          "visual_impaired": 0,
          "clean_effects": 0,
          "attached_pic": 0,
          "timed_thumbnails": 0,
          "captions": 0,
          "descriptions": 0,
          "metadata": 0,
          "dependent": 0,
          "still_image": 0
        },
        "tags": {
          "creation_time": "2025-01-23T01:17:59.000000Z",
          "language": "und",
          "handler_name": "SoundHandler",
          "vendor_id": "[0][0][0][0]"
        }
      }
    ],
}

[mifi]

i'm collecting issues like this in #2307 for future reference. A workaround is to "convert to supported format", but because it works on my computer I don't know how to fix this.

[GRFTSOL]

what's your OS?

Both Windows and Linux:

• Under windows, I tried microsoft edge with Media Foundation provided HEVC decoder, cannot display video; while Firefox can display well.
• Under Linux, I tried, chromium and firefox with Mesa driver, same as windows.

Knowing it can be decoded on Mac OS, I did some search about hardware decode on chromium, and found this repo,

Mac OS on M Series is capable of decoding:

Note 1: Intel Macs support HEVC Rext software decoding of 8 ~ 12b 400, 420, 422, 444 contents. Apple Silicon Mac supports HEVC Rext hardware decoding of 8 ~ 10b 400, 420, 422, 444 contents, and software decoding of 12b 400, 420, 422, 444 contents.

And I found the answer of my problem:

Note 3: Although NVIDIA GPUs support HEVC Rext hardware decoding of 8 ~ 12b non-422 contents via CUVID or NVDEC, but because they did not provide a D3D11 interface, thus Chromium will not support it in the future.

I think this issue can be ignored, I will change my encoding profile, thank you Mikael :)

[mifi]

Ok, nice research there, thanks. I will add that link to the other issue