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• avcodec/h2645_sei : loosen up min luminance requirements

  25 mai 2024, par Niklas Haas

  avcodec/h2645_sei : loosen up min luminance requirements
  The H.265 specification is quite clear on this case :
  > When min_display_mastering_luminance is not in the range of 1 to
  
  > 50000, the nominal maximum display luminance of the mastering display
  
  > is unknown or unspecified or specified by other means not specified in
  
  > this Specification.
  And so the current code is correct in marking luminance data as invalid
  
  if min luminance is set to 0. However, this breaks playback of at least
  
  several real-world Blu-ray releases, for example La La Land, Planet of
  
  the Apes, and quite possibly a lot more. These come with ostensibly
  
  valid max_luminance tags (1000 nits), but min_luminance set to 0.
  Loosen up this requirement by guarding it behind FF_COMPLIANCE_STRICT.
  
  We still reject blatantly invalid metadata (wrong value range on
  
  luminance, max set to 0, max below min, min above 50 nits etc.), so this
  
  shouldn't cause any unintended regressions.
  Fixes : https://github.com/mpv-player/mpv/issues/14177
  

  • [DH] libavcodec/h2645_sei.c

• The error "Failed to query nvenc max version" typically occurs when using FFmpeg on Linux

  28 juillet 2023, par Well Chen

  The error "Failed to query nvenc max version" typically occurs when using FFmpeg with NVIDIA GPU acceleration (hevc_nvenc) on Linux.

  


  Does anyone know how to solve this bug ? Thank you very much.

  


  The following code is the FFmpeg code I entered, along with the output content.

  


  ffmpeg -ss 10:00 -i /www/wwwroot/pyffmpeg/videos/0/011.mp4 -t 20 -r 30 -b:v 4M -an -vcodec hevc_nvenc -y /www/wwwroot/pyffmpeg/videos/post/999.mp4
ffmpeg version 6.0 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 8 (GCC)
  configuration: --extra-cflags='-I/usr/local/cuda/include -fPIC ' --extra-ldflags='-L/usr/local/cuda/lib64 -ldl ' --pkg-config-flags=--static --enable-shared --enable-gpl --enable-cuvid --enable-nvenc --enable-nonfree --nvcc='nvcc=/usr/local/cuda-12.2/bin/nvcc'
  WARNING: library configuration mismatch
  avutil      configuration: --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC ' --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl ' --pkg-config-flags=--static --enable-shared --enable-gpl --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
  avcodec     configuration: --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC ' --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl ' --pkg-config-flags=--static --enable-shared --enable-gpl --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
  avformat    configuration: --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC ' --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl ' --pkg-config-flags=--static --enable-shared --enable-gpl --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
  avdevice    configuration: --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC ' --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl ' --pkg-config-flags=--static --enable-shared --enable-gpl --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
  avfilter    configuration: --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC ' --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl ' --pkg-config-flags=--static --enable-shared --enable-gpl --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
  swscale     configuration: --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC ' --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl ' --pkg-config-flags=--static --enable-shared --enable-gpl --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
  swresample  configuration: --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC ' --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl ' --pkg-config-flags=--static --enable-shared --enable-gpl --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
  postproc    configuration: --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC ' --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl ' --pkg-config-flags=--static --enable-shared --enable-gpl --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
  libavutil      58.  2.100 / 58.  2.100
  libavcodec     60.  3.100 / 60.  3.100
  libavformat    60.  3.100 / 60.  3.100
  libavdevice    60.  1.100 / 60.  1.100
  libavfilter     9.  3.100 /  9.  3.100
  libswscale      7.  1.100 /  7.  1.100
  libswresample   4. 10.100 /  4. 10.100
  libpostproc    57.  1.100 / 57.  1.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/www/wwwroot/pyffmpeg/videos/0/011.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf59.6.100
  Duration: 00:17:48.83, start: 0.000000, bitrate: 4617 kb/s
  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/bt470bg/bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 4481 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc.
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc.
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> hevc (hevc_nvenc))
Press [q] to stop, [?] for help
[hevc_nvenc @ 0x2a577790] Failed to query nvenc max version: unknown error (-756041696): (no details)
Segmentation faul


  


  I have installed FFmpeg, NVIDIA GPU drivers, and SDK. It works fine without using GPU acceleration, but it throws an error when using GPU acceleration.

  


• FFMPEG : how to create a "title slide" for 3 seconds before a video [closed]

  15 mars 2024, par ashay

  I'm trying to make a lecture video to put online. I have the video itself, and I have a title slide that I'd like to play for 3 seconds before the main video.

  


  I tried using ffmpeg to (1) create a 3 second long video from the title slide and (2) concat the two videos together.

  


  I'm having issues concatenating the videos together — when I do so, the resulting video is much longer than it should be. When I look online, others have similar problems — and this seems to occur when the parameters of the two videos do not match perfectly.

  


  I'd prefer to do this without re-encoding the main video — and it seems this should be possible because I should be able to control what parameters are set for the "lecture slide video".

  


  Here are the commands I've run.
The main video has framerate 25, resolution 1920x1080, and an audio stream at #0:0 and a video stream at #0:1 (according to ffmpeg -i [video].

  


  To create the video of the title slide, I ran ffmpeg -framerate 25 -i lec01_title.png -t 3 -c:v libx264 -x265-params lossless=1 -pix_fmt yuvj420p -vf scale=1920:1080 lec01_title.mp4 -f lavfi -i anullsrc -c:a aac -shortest.
Then to reorder the streams to match the main video, I ran ffmpeg -i lec01_title.mp4 -map 0:a -map 0:v -c:v copy -c:a copy lec01_title_matched.mp4.

  


  Then to concatenate the two files together, I created a text file "concat_list" with :
file 'lec01_title_matched.mp4' file 'lec01.mp4', and ran the command ffmpeg -f concat -safe 0 -i concat_list.txt -c copy -movflags +faststart output.mp4.

  


  The main video is 53 minutes long, but the final output video after concatenating is 1 hour and 43 minutes long.

  


  I'm looking for advice for how to create the "lecture title video" properly to match the parameters of the second video so that I can concatenate them without problems.

  


  Here's the output of ffmpeg -i lec01.mp4 :

  


  ffmpeg version 6.1.1 Copyright (c) 2000-2023 the FFmpeg developers
  built with Apple clang version 15.0.0 (clang-1500.1.0.2.5)
  configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/6.1.1 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags='-Wl,-ld_classic' --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libharfbuzz --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox --enable-neon
  libavutil      58. 29.100 / 58. 29.100
  libavcodec     60. 31.102 / 60. 31.102
  libavformat    60. 16.100 / 60. 16.100
  libavdevice    60.  3.100 / 60.  3.100
  libavfilter     9. 12.100 /  9. 12.100
  libswscale      7.  5.100 /  7.  5.100
  libswresample   4. 12.100 /  4. 12.100
  libpostproc    57.  3.100 / 57.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'dcai_lec01.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    title           : 2-190-wideshot
    encoder         : Lavf60.16.100
  Duration: 00:47:39.08, start: 0.000000, bitrate: 1435 kb/s
  Stream #0:0[0x1](und): Audio: aac (LC) (mp4a / 0x6134706D), 96000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 1298 kb/s, 25 fps, 25 tbr, 12800 tbn (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc60.31.102 libx264


  


  Described above in detail.