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• Point CMake project to specific include file

  16 novembre 2011, par Unapiedra

  I am trying to build OpenCV 2.3.0 with FFMPEG enabled. Since Ubuntu 11.10 only supplies libavcodec/format with version 0.7 and the ticket #1020(link below) indicates that it should work with 0.8.

  If I try to compile I get the following error :

  [ 18%] Building CXX object modules/highgui/CMakeFiles/opencv_highgui.dir/src/cap_ffmpeg.o
  
  In file included from /home/chris/src/OpenCV-2.3.0/modules/highgui/src/cap_ffmpeg.cpp:45:0:
  
  /home/foo/src/OpenCV-2.3.0/modules/highgui/src/cap_ffmpeg_impl.hpp:103:36: fatal error: libavformat/avformat.h: No such file or directory
  
  compilation terminated.

  This file lives in /opt/linux64-debug/include/ffmpeg/libavformat/avformat.h. I tried pointing make at that with CMAKE_INCLUDE_DIRECTORY,PATH, CMAKE_PREFIX_PATH and CMAKE_LIBRARY_PATH. None of that worked. ( I always used the path /opt/linux64-debug/include/ffmpeg.)

  https://code.ros.org/trac/opencv/ticket/1020

• What codec should I specify for an MP4 in my HTML5 video source tag ?

  28 avril 2016, par callum

  Based on Dive Into HTML5 I’ve written HTML something like this :

  <video controls="controls">
  
    <source src="my-video.mp4" type="video/mp4; codecs=avc1.42E01E,mp4a.40.2">
  
    <source src="my-video.webm" type="video/webm; codecs=vp8,vorbis">
  
    <source src="my-video.ogv" type="video/ogg; codecs=theora,vorbis">
  
  </source></source></source></video>

  I know the codecs specified for WebM and OGG are correct... But what about the avc1.42E01E,mp4a.40.2 ? How do I know if that’s correct ?

  I encoded my video like this :

  ffmpeg -i my-video.mov \
  
    -acodec libfaac -ab 96k \
  
    -vcodec libx264 \
  
    -level 21 -refs 2 -b:v 345k -bt 345k \
  
    -threads 0 -s 1920x780 my-video.mp4

  Can you tell from this command, or is there some way I can tell from the video ? Media Information in VLC didn’t help.

• ffmpeg hwaccel no decoder surfaces left

  11 février 2023, par desperateLord

  Recently I compiled natively the latest version of ffmpeg 4.3 on Windows 10 amd64.
Evironment:CUDA11.0, NASM, VS2019, MYSY2 with mingw64.

  


  I also used the patch https://trac.ffmpeg.org/attachment/ticket/9019/0001-Patch-for-ticket-9019-CUDA-Compile-Broken-Using-MSVC.patch

  


  Compile featrues were :

  


  --enable-nonfree --enable-cuda-nvcc --enable-libnpp --enable-gpl --enable-libx264 --enable-cuda-llvm --enable-nvenc
--toolchain=msvc --extra-cflags=-I../nv_sdk --extra-ldflags=-libpath:../nv_sdk


  


  I tested ffmpeg for cuda acceleration. the CPU is an AMD 3500x. the GPU is an RTX 2060Ultra.

  


  Issuing this command :

  


  .\ffmpeg -hwaccel cuvid -i .\a.wmv -c:v hevc_nvenc -bf 4 -preset slow -c:a aac -b:a 256k myvideo.mp4


  


  But recieved this error :

  


  [wmv3 @ 000002632DFC5180] No decoder surfaces left
Error while decoding stream #0:0: Cannot allocate memory
[hevc_nvenc @ 00000263300B1740] Failed locking bitstream buffer: out of memory (10):
video encoding failed: Cannot allocate memory


  


  I'm not sure where I've gone wrong here.