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• ffmpeg error with device when transcoding from HEVC to H.264 on GPU using NVENC [closed]

  5 décembre 2022, par Slakter

  I wanted to transcode my videos that have hevc encoding into h.264 using ffmpeg with Nvidia CUDA acceleration.
Basically I've followed the guide provided in the official documentation and read through CUDA part in here

  


  My GPU is GeForce RTX2060 and the OS is Windows 10

  


  ffmpeg configuration just after start says :

  


  ffmpeg version 5.1.2-essentials_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 12.1.0 (Rev2, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100


  


  So all the required options for Nvidia encoding are in the list.

  


  Then I tried to transcode a video in mkv format with encoding H.265 (hevc) into h.264 using h264_nvenc .
Here is the line

  


   ffmpeg -hwaccel cuda -hwaccel_device 0 -hwaccel_output_format cuda -extra_hw_frames 14 -i .\input.mkv -c:v h264_nvenc -profile:v high444p -pixel_format yuva444p16le -preset lossless -b:v 1M output.mp4 -y


  


  Even when I leave just this, the error is the same

  


   ffmpeg -hwaccel cuda -hwaccel_device 0 -hwaccel_output_format cuda -i .\Violet1.mkv -c:v h264_nvenc output.mp4 -y


  


  Here is the error message :

  


  Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> h264 (h264_nvenc))
  Stream #0:1 -> #0:1 (opus (native) -> aac (native))
Press [q] to stop, [?] for help
[h264_nvenc @ 000002023642d7c0] 10 bit encode not supported
[h264_nvenc @ 000002023642d7c0] Provided device doesn't support required NVENC features
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height


  


  Also, If I take another file with encoding H.265 (hev1) in mp4 format and use the command below, then it works fine.

  


  ffmpeg -hwaccel cuda -hwaccel_device 0 -hwaccel_output_format cuda -extra_hw_frames 5 -i .\hev1.mp4 -gpu 0 -c:v h264_nvenc -profile:v high444p -preset lossless -b:v 1M output.mp4 -y


  


  It's the same as the first command but with different extra_hw_frames and output file

  


  My guess is that the problem in encoding from mkv or hevc codec specifically or maybe I have to change some options, but I haven't found anything about this error in the net. Thanks everyone how could help

  


• Attempting to encode .png images to video format .avi. Getting an output error

  23 janvier 2023, par Trey King

  Here is the problem. My code is :

  


  cat *.png | ffmpeg -framerate 30 -f image2pipe -i -c:a copy -c:v libx264 -crf 18 -preset veryslow - output.avi


  


  output is :

  


  ffmpeg -framerate 30 -f image2pipe -i -c:a copy -c:v libx264 -crf 18
-preset veryslow - output.avi ffmpeg version 5.1.2-essentials_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers   built with gcc 12.1.0 (Rev2, Built by MSYS2 project)   configuration: --enable-gpl --enable-version3 --enable-static
--disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband   libavutil      57. 28.100 / 57. 28.100   libavcodec     59. 37.100 / 59. 37.100   libavformat   
59. 27.100 / 59. 27.100   libavdevice    59.  7.100 / 59.  7.100   libavfilter     8. 44.100 /  8. 44.100   libswscale      6.  7.100 / 
6.  7.100   libswresample   4.  7.100 /  4.  7.100   libpostproc    56.  6.100 / 56.  6.100
-c:a: Protocol not found Did you mean file:-c:a?


  


  I am not sure how to proceed.

  


  A one liner that I found elsewhere.

  


• ffmpeg video duration is not equal to duration after hls process

  9 décembre 2022, par Timur Khazhiev

  Problem

  


  For videofile input I preprocess/encode it to libx264. Then I'm trying to cut video into 2 second chunks except last one (last one being < 2 seconds) using hls processing

  &#xA;

  ffmpeg -v error -i video.mp4 -x264-params "keyint=60:min-keyint=60:scenecut=0" 
-hls_time 2 -hls_list_size 0 -hls_segment_filename chunk%03d.ts index.m3u8


  &#xA;

  which follows this problem

  &#xA;

  then looking into index.m3u8 file reveals that sum of all chunks' durations does not add up to original video duration :

  &#xA;

  % ffprobe -loglevel quiet -print_format flat -show_entries format=duration index.m3u8     

format.duration="204.880000"

% ffprobe -loglevel quiet -print_format flat -show_entries format=duration video.mp4 

format.duration="204.892813"


  &#xA;

  Moreover duration of a chunk in index.m3u8 is not the same as in chunk file.

  &#xA;

  % ffprobe -loglevel quiet -print_format flat -show_entries format=duration chunk000.ts

format.duration="2.023222"

% cat index.m3u8
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:2
#EXT-X-MEDIA-SEQUENCE:0
#EXTINF:2.000000,
chunk000.ts
#EXTINF:2.000000,
chunk001.ts
#EXTINF:2.000000,
chunk002.ts
...


  &#xA;

  Misc

  &#xA;

  Used these videos : Me at the zoo and I finally found a useful monorail.

  &#xA;

  OS : macos Monterey 12.3.1 (21E258)

  &#xA;

  ffmpeg version 5.1.2 Copyright (c) 2000-2022 the FFmpeg developers
built with Apple clang version 14.0.0 (clang-1400.0.29.102)
configuration: --prefix=/usr/local/Cellar/ffmpeg/5.1.2 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --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
libavutil      57. 28.100 / 57. 28.100
libavcodec     59. 37.100 / 59. 37.100
libavformat    59. 27.100 / 59. 27.100
libavdevice    59.  7.100 / 59.  7.100
libavfilter     8. 44.100 /  8. 44.100
libswscale      6.  7.100 /  6.  7.100
libswresample   4.  7.100 /  4.  7.100
libpostproc    56.  6.100 / 56.  6.100


  &#xA;

  What I tried

  &#xA;

  &#xA;
  • Preprocess/transcode video before proceeding with hls

  &#xA;

  • Force keyframes before proceeding with hls

  &#xA;

  • Use 1, 3, 4 seconds chunks

  &#xA;

  • Use different GOP sizes

  &#xA;

  • -hls_flags split_by_time

  &#xA;

  &#xA;

  but it leads to same result or very unequal chunks

  &#xA;

  Questions

  &#xA;

  &#xA;
  1. Is it ok or I'm missing something ?

  &#xA;

  2. If not, what parameters/options should I use to force chunks to be precisely 2 seconds ?

  &#xA;

  &#xA;