Recherche avancée

Sur d’autres sites (7000)

• How do you specify container format in FFmpeg ?

  15 avril 2021, par TheNeuronalCoder

  I am trying to encode mp4 video, but it doesn't open on my macbook because while it has the supported H264 codec, the container format is not MP4. So all I ask is how you would go about specifying the container format so I can generate video that is actually playable without using ffplay.

  


  ffprobe version N-101948-g870bfe1 Copyright (c) 2007-2021 the FFmpeg developers
  built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
  configuration: --disable-asm --enable-shared --enable-libx264 --enable-gpl
  libavutil      56. 72.100 / 56. 72.100
  libavcodec     58.136.101 / 58.136.101
  libavformat    58. 78.100 / 58. 78.100
  libavdevice    58. 14.100 / 58. 14.100
  libavfilter     7.111.100 /  7.111.100
  libswscale      5. 10.100 /  5. 10.100
  libswresample   3. 10.100 /  3. 10.100
  libpostproc    55. 10.100 / 55. 10.100
Input #0, h264, from 'animation.mp4':
  Duration: N/A, bitrate: N/A
  Stream #0:0: Video: h264 (High), yuv420p(progressive), 1920x1080, 24.33 fps, 24 tbr, 1200k tbn, 48 tbc


  


  void imagine::Camera::Record() {&#xA;  if (recording_ == true)&#xA;    throw std::runtime_error(&#xA;      "you must close your camera before starting another recording"&#xA;    );&#xA;  recording_ = true;&#xA;&#xA;  output_file_ = std::fopen(output_.c_str(), "wb");&#xA;  if (!output_file_)&#xA;    throw std::runtime_error("failed to open file");&#xA;&#xA;  AVCodec* codec = avcodec_find_encoder(AV_CODEC_ID_H264);&#xA;  if (!codec)&#xA;    throw std::runtime_error("failed to find codec");&#xA;&#xA;  context_ = avcodec_alloc_context3(codec);&#xA;  if (!context_)&#xA;    throw std::runtime_error("failed to allocate video codec context");&#xA;&#xA;  packet_ = av_packet_alloc();&#xA;  if (!packet_)&#xA;    throw std::runtime_error("failed to allocate video packet");&#xA;&#xA;  py::tuple size = py::globals()["main_scene"].attr("size");&#xA;  context_->width = size[0].cast<int>();&#xA;  context_->height = size[1].cast<int>();&#xA;  context_->bit_rate = 0.4 * fps_ * context_->width * context_->height;&#xA;  context_->time_base = (AVRational){ 1, fps_ };&#xA;  context_->framerate = (AVRational){ fps_, 1 };&#xA;  context_->gop_size = 10;&#xA;  context_->max_b_frames = 1;&#xA;  context_->pix_fmt = AV_PIX_FMT_YUV420P;&#xA;&#xA;  if (avcodec_open2(context_, codec, NULL) &lt; 0)&#xA;    throw std::runtime_error("failed to open codec");&#xA;&#xA;  frame_ = av_frame_alloc();&#xA;  if (!frame_)&#xA;    throw std::runtime_error("failed to allocate video frame");&#xA;&#xA;  frame_->width  = context_->width;&#xA;  frame_->height = context_->height;&#xA;  frame_->format = AV_PIX_FMT_YUV420P;&#xA;&#xA;  if (av_frame_get_buffer(frame_, 0) &lt; 0)&#xA;    throw std::runtime_error("failed to allocate the video frame data");&#xA;}&#xA;</int></int>

  


• dxva : fix some warnings

  22 juin 2017, par wm4

  dxva : fix some warnings
  Some existed since forever, some are new.
  The cast in get_surface() is silly, but unless we change the av_log
  
  function signature, or all callers of ff_dxva2_get_surface_index(), it's
  
  needed to remove the const warning.
  Merges Libav commit 752ddb45569ffe278393cd853b70f18ae017219e.
  Signed-off-by : Luca Barbato <lu_zero@gentoo.org>
  

  • [DH] libavcodec/dxva2.c

• ffmpeg - on end function probably not working correctly ?

  19 janvier 2020, par Jul Pod

  got this code to loop through some .mp4 files and create a screenshot of them :

  files.forEach(file => {
  
      console.log(file);
  
      if(!fs.existsSync('img/' + file.replace('.mp4', '.png'))) {
  
  
  
          ffmpeg({ source: 'movies/' + file})
  
          .takeScreenshots({ timemarks: [ '50' ], size: '150x100' }, 'img/', function(err, filenames) {
  
          })
  
          .on('end', function() {      
  
            fs.rename('img/tn.png', 'img/' + file.replace('.mp4', '.png'), function(err) {if (err) console.log('Error: ' + err) }); 
  
            sleep(1000);  
  
        })   
  
        }    
  
  });

  Now i got the problem that it seems like that .on(end) is sometimes not working, Error :
  ENOENT : no such file or directory, rename

  i think it´s because the process of saving the tn.png is slower than the renaming...