Newest 'x264' Questions - Stack Overflow

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• How to check 'Output bit depth' of the libx264 library in ffmpeg ?

  25 mars 2014, par Amiramix

  According to the x264 Encoding Guide, the crf scale depends on whether x264 is 8-bit or 10-bit. Supposedly x264 --help shows the Output bit depth. But on Windows ffmpeg -h full doesn't say anything about Output bit depth and the crf scale option is described as from -1 to FLT_MAX. How can I check if my ffmpeg is using 8-bit or 10-bit version of the libx264 library?

• ClassX installation "codec not found" due to dependencies [migrated]

  25 mars 2014, par khateeb

  ClassX is an interactive lecture streaming system developed in the Electrical Engineering Department at Stanford University. Unlike conventional lecture capturing systems, ClassX requires very simple consumer-grade equipment and minimal human operation.

  I faced problems during installing it, I hope you have a solution.

  BTW: I successfully installed it 2 years ago, but now I think the problem as the dependencies and Ubuntu versions are different than the versions we used two years ago.

  Detailed description of the problem:

  • I'm using Ubuntu 12.04
  • I followed the instructions @ ClassX installation guide, and all steps till step 4 are successfully done (the encoder bin file generated).
  • When trying to encode the video using the classX web system, it shows the encoding completed after few seconds.However, there are no tiles generated.

  • I tried to execute the command at CX_log.txt, and the following error appears.

    mahmoud@Mahmoud-HP-Pavilion-dv5-Notebook-PC:~$ sudo perl /var/www/ClassXWebSystem/system/publishers/web/actions/encode.pl "/var/www/ClassXWebSystem/content/encoding/FALL_2013_2014/CS106A_FALL_2013_2014/lecSEven" "/var/www/ClassXWebSystem/content/encoding/FALL_2013_2014/CS106A_FALL_2013_2014/.encoding_1372706251" "/var/www/ClassXWebSystem/content/streaming/FALL_2013_2014/CS106A_FALL_2013_2014/lecSEven" "/var/www/ClassXWebSystem/system/publishers/bin" classx y n n [sudo] password for mahmoud: 00068.jpg .. . 00068.mp4 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/var/www/ClassXWebSystem/content/encoding/FALL_2013_2014/CS106A_FALL_2013_2014/.encoding_1372706251/00068.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf52.39.0 Duration: 00:02:30.05, start: 0.000000, bitrate: 8141 kb/s Stream #0.0(und): Video: h264, yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 8007 kb/s, 29.95 fps, 29.97 tbr, 2997 tbn, 59.94 tbc Stream #0.1(und): Audio: aac, 44100 Hz, stereo, s16, 128 kb/s Output #0, mp4, to '/var/www/ClassXWebSystem/content/encoding/FALL_2013_2014/CS106A_FALL_2013_2014/.encoding_1372706251/stream0.mp4': Stream #0.0: Video: [0][0][0][0] / 0x0000, yuv420p, 640x360, q=32-36, 64 kb/s, 90k tbn, 14.99 tbc codec not found

• how to set x264 encoder output 720P when the input is 1080P on linux

  8 mars 2014, par Lyric

  I use libx264 on ubuntu, programming use C.

  I want to set x264 encoder output 720P. The input image size is 1080P. How to set the params?

  I don't know whether set the two parameters:

  param->vui.i_sar_width = ?; 
  param->vui.i_sar_height= ?;
  

  or another parameter crop-rect?

• Use x264 convert 1080p to 720p on linux,How to set the x264 parameters ? [closed]

  8 mars 2014, par Lyric

  all,

  I want to use x264 convert 1080p to 720p on Linux,How to set the x264 parameters?please help me.

• libx264 runtime check failure #2

  4 mars 2014, par PeeVee75

  I have built libx264.dll as explained in http://doom10.org/index.php?topic=1876.0

  However, when I try to run a simple test by just initializing an x264_param_t variable to the default values, and exiting the program, I get a runtime check failure #2 error.

  I'm on a Win7 machine with VS2005. Below is the code I'm trying to run. Is there something I need to clean in x264_param_t before exiting?

  extern "C" {
    #include "stdint.h"
    #include "x264.h"
  }
  
  void InitX264Params(x264_param_t *outX264Param)
  {
    x264_param_default(outX264Param);
  }
  
  int main(int argc,const char **argv)
  {
    x264_param_t x264Param;
    InitX264Params(&x264Param);
    return 0;
  }