Newest 'x264' Questions - Stack Overflow

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• encode x264(libx264) raw yuv frame data

  26 juin 2015, par Mohamed El-Sayed

  I am trying to encode an MP4 video using raw YUV frames data, but I am not sure how can I fill the plane data (preferably without using other libraries like ffmpeg)

  The frame data is already encoded in I420, and does not need conversion.

  Here is what I am trying to do:

  const char *frameData = /* Raw frame data */;
  
  x264_t *encoder = x264_encoder_open(&param);
  x264_picture_t imgInput, imgOutput;
  x264_picture_alloc(&imgInput, X264_CSP_I420, width, height);
  
  // how can I fill the struct data of imgInput
  
  x264_nal_t *nals;
  int i_nals;
  int frameSize = x264_encoder_encode(encoder, &nals, &i_nals, &imgInput, &imgOutput);
  

  The equivalent command line that I have found is :

   x264 --output video.mp4 --fps 15 --input-res 1280x800 imgdata_01.raw 
  

  But I could not figure out how the app does it.

  Thanks.

• Windows : How to build X264.lib instead of .dll

  25 juin 2015, par user1884325

  I downloaded the X264 source and installed mingw.

  Step 1:

  Executed this in the MINGW bash:

  ./configure --disable-cli --enable-shared --enable-win32thread - -extra-ldflags=-Wl,--output-def=libx264.def

  and then 'make'

  Step 2:

  Renamed the libx264-142.dll to libx264.dll and Opened up VS2012 Command Prompt and executed this:

  LIB /DEF:libx264.def

  which gave me libx264.lib and object libx264.exp

  Step 3:

  Included the lib file in a VS2012 project which uses the X264 API.

  Problem:

  When I start the project I get the following error message:

  "The program can't start because libx264.dll is missing from your computer"

  Question:

  Why is it looking for the dll when I'm linking the static library in?

  How do I resolve this? I would like to build a static X264 library which I can link in with my project.

  EDIT:

  I just had to put the dll in the same directory as the project executable.

  However - My question still stands: How do I build a static x264 library? So I don't need the dll?

• x264 failed to load avisynth - ubuntu 14.04

  23 juin 2015, par Shoham

  Im trying to reduce a video.mov file (taken with canon dslr). Im using x264 like so:

  x264 -o '/home/user/Desktop/MVI_0390.mp4'  '/home/user/Desktop/MVI_0390.MOV'
  

  And Im getting following error:

  avs [error]: failed to load avisynth
  raw [error]: raw input requires a resolution.
  x264 [error]: could not open input file `/home/user/Desktop/MVI_0390.MOV' via any method!
  

  What am I doing wrong?

• Decode mJPEG to a format usable by libx264

  16 juin 2015, par Dan Tumaykin

  I am compressing frames coming from webcam with libx264. So far I used YUY2 raw frames and swscale to transcode the frames to I420, which is usable by x264.

  Anyway I would like to add support for mJPEG webcams (usually webcam provides both, but mJPEG allows higher frame rates and resolutions). What can I use to transcode mJPEG to some format, that can be used by x264?

• Why av_find_encoder(AV_CODEC_ID_H264) has no profiles

  14 juin 2015, par SabinManiac

  I have this code:

  int32_t codecs[ ] = { AV_CODEC_ID_H264, AV_CODEC_ID_VP8,   AV_CODEC_ID_VP9 };
  AVCodec* codec;
  const AVProfile* profile=nullptr;
  for ( int32_t i=0;isizeof(codecs[0]);++i) {
  codec = avcodec_find_encoder(static_cast(codecs[i]));
  if (codec) {
    profile = codec->profiles;
    printf("%s\n",codec->name);
    if(!profile)
        printf("\t NO PROFILE\n");
    while (profile &&
           profile->profile!=FF_PROFILE_UNKNOWN){
      printf("\t:%s\n",profile->name);
      profile++;
    }
  } else {
    printf("No codec.\n");
  }
  }
  return true;
  

  Why doesn't the encoder have a list of profiles. If I replace avcodec_find_encoder with avcodec_find_decoder I have the profiles listed. I know that the decoder is implemented inside ffmpeg and the encoder in x264, but is there any way to make this work. I need to know what profiles are available(at least for AV_CODEC_ID_H264).