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  1. Qt
  2. QTBUG-135982

[ffmpeg] encoder problems with nvidia on ubuntu 25.04

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: P2: Important P2: Important
    • None
    • 6.10
    • Multimedia
    • Linux/Wayland

      hardware encoding via nvidia seems to fail on ubuntu 25.04:

      "FFmpeg log: NVDEC capabilities:"
"FFmpeg log: format supported: yes, max_mb_count: 65536"
"FFmpeg log: min_width: 48, max_width: 4096"
"FFmpeg log: min_height: 16, max_height: 4096"
"FFmpeg log: decoder->cvdl->cuvidCreateDecoder(&decoder->decoder, params) failed"
"FFmpeg log:  -> CUDA_ERROR_INVALID_VALUE: invalid argument"
"FFmpeg log: "
"FFmpeg log: Using more than 32 (39) decode surfaces might cause nvdec to fail."
"FFmpeg log: Try lowering the amount of threads. Using 16 right now."
"FFmpeg log: Failed setup for format cuda: hwaccel initialisation returned error."
"FFmpeg log: Format cuda not usable, retrying get_format() without it."
qt.multimedia.ffmpeg.hwaccel: Selected format with no conversion 0

      (building against ffmpeg-7.1.1, as provided by ubuntu)

        For Gerrit Dashboard: QTBUG-135982
        # Subject Branch Project Status CR V
        639714,3 FFmpeg: work around nvdec issue with multiple surfaces dev qt/qtmultimedia Status: NEW 0 0

            qtmultimediateam Qt Multimedia Team
            timblechmann tim blechmann
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              Created:
              Updated:

                There is 1 open Gerrit change