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• 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>

  


• avcodec/put_bits : Add functions for amount of bytes written/left

  25 mars 2021, par Andreas Rheinhardt

  avcodec/put_bits : Add functions for amount of bytes written/left
  Often a caller doesn't want the amount of bits written via a
  
  PutBitContext, but the amount of bytes. This in particular happens
  
  after one has flushed the PutBitContext (e.g. at the end of encoding,
  
  when one wants to know the actual packet size). The current way of doing
  
  this is with put_bits_count(pb)/8 (or (put_bits_count(pb) + 7)/8).
  Yet this has some issues : It contains implicit multiplications and
  
  divisions by 8 with a cast in between ; it obscurs the intent ; and
  
  it restricts the size of the buffer to (currently) INT_MAX/8 (or
  
  to 1/8 of the maximum of whatever put_bits_count() returns), although
  
  said restriction is not really necessary for users that don't need
  
  a bitcount.
  Corresponding functions for the amount of bytes left have also been
  
  addded.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavcodec/put_bits.h

• avcodec/aacdec_template : Avoid undefined negation in imdct_and_windowing_eld()

  20 janvier 2021, par Michael Niedermayer

  avcodec/aacdec_template : Avoid undefined negation in imdct_and_windowing_eld()
  Fixes : negation of -2147483648 cannot be represented in type 'INTFLOAT' (aka 'int') ; cast to an unsigned type to negate this value to itself
  
  Fixes : 29057/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AAC_FIXED_fuzzer-5642758933053440
  Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/aacdec_template.c