Newest 'libx264' Questions - Stack Overflow

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• ffmpeg x264 CPU core scaling

  12 mai 2017, par alex416

  Does anyone have any experence with this type of thing? Currently using a Ryzen 7 8c/16T CPU, and using a program called BES. Using 10% CPU, is almost no slower at transcoding from mkv to mp4 (both x264, i know i can just copy them) than using 100% cpu on all 16 threads. So, Since this is the case, What is the ideal core count for libx264? I mean, Does the same type of thing happen with 32 threads? Or 8 threads, etc.

• How to decode using libx264 package ?

  6 mai 2017, par Peter

  Environment: Ubuntu 16.04, package libx264-148

  I am looking at decoding some x264-encoded data using libx264 library. I found a sample at https://code.videolan.org/solaris/x264/raw/7d35ba6bf080610d8f144f4270e961c69ba14f1c/x264.c. It is using APIs such as x264_decoder_open and x264_decoder_decode. However, when I examine /usr/include/x264.h, I see APIs only for encoding such as x264_encoder_open and x264_encoder_encode. There are no APIs for decoding. I am wondering if I am missing something. Are we supposed to use the same APIs for encoding as well as decoding? Also, pointer to any code sample will be highly appreciated. Regards.

  PS: It is a similar issue with x265.h as well.

• How to decode using libx264 package ?

  6 mai 2017, par Peter

  Environment: Ubuntu 16.04, package libx264-148

  I am looking at decoding some x264-encoded data using libx264 library. I found a sample at https://code.videolan.org/solaris/x264/raw/7d35ba6bf080610d8f144f4270e961c69ba14f1c/x264.c. It is using APIs such as x264_decoder_open and x264_decoder_decode. However, when I examine /usr/include/x264.h, I see APIs only for encoding such as x264_encoder_open and x264_encoder_encode. There are no APIs for decoding. I am wondering if I am missing something. Are we supposed to use the same APIs for encoding as well as decoding? Also, pointer to any code sample will be highly appreciated. Regards.

  PS: It is a similar issue with x265.h as well.

• x264 Encoding use x264_picture_clean crash

  5 mai 2017, par Wong Sam

  When I use iphone encoding CMSampleBufferRef To H264, it offen crash at x264_picture_clean I dont't know how to deal it

  enter image description here

  x264_picture_t* pPic_in; 
  

  here is my init about pPic_in

  pPic_in = (x264_picture_t*)malloc(sizeof(x264_picture_t));
  pPic_out = (x264_picture_t*)malloc(sizeof(x264_picture_t));
  
  x264_picture_init(pPic_out);
  
  x264_picture_init(pPic_in);
  x264_picture_alloc(pPic_in, csp, pParam->i_width, pParam->i_height);
  
  pPic_in->img.i_stride[0] = width;
  pPic_in->img.i_stride[1] = width / 2;
  pPic_in->img.i_stride[2] = width / 2;
  pPic_in->img.i_plane = 3;
  

  and i set data here

      picture_buf = yuv420_data;
      pPic_in->img.plane[0] = picture_buf;
      pPic_in->img.plane[1] = picture_buf + y_size;
      pPic_in->img.plane[2] = picture_buf + y_size*5/4;
  

  it looks well , when i run it on my iphone,but sometimes it will crash at

  x264_picture_clean
  

  here is more detail abuot pPic_in when crash occer enter image description here

  Thank u very much

• x264 Encoding use x264_picture_clean crash

  5 mai 2017, par Wong Sam

  When I use iphone encoding CMSampleBufferRef To H264, it offen crash at x264_picture_clean I dont't know how to deal it

  enter image description here

  x264_picture_t* pPic_in; 
  

  here is my init about pPic_in

  pPic_in = (x264_picture_t*)malloc(sizeof(x264_picture_t));
  pPic_out = (x264_picture_t*)malloc(sizeof(x264_picture_t));
  
  x264_picture_init(pPic_out);
  
  x264_picture_init(pPic_in);
  x264_picture_alloc(pPic_in, csp, pParam->i_width, pParam->i_height);
  
  pPic_in->img.i_stride[0] = width;
  pPic_in->img.i_stride[1] = width / 2;
  pPic_in->img.i_stride[2] = width / 2;
  pPic_in->img.i_plane = 3;
  

  and i set data here

      picture_buf = yuv420_data;
      pPic_in->img.plane[0] = picture_buf;
      pPic_in->img.plane[1] = picture_buf + y_size;
      pPic_in->img.plane[2] = picture_buf + y_size*5/4;
  

  it looks well , when i run it on my iphone,but sometimes it will crash at

  x264_picture_clean
  

  here is more detail abuot pPic_in when crash occer enter image description here

  Thank u very much