Newest 'x264' Questions - Stack Overflow

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  • How to achieve 2 pass encoding using x264 ?

    6 avril 2017, par Kim Kardashian

    is there a parameter in the x264_param_t structure or do I have to send frames to x264 dll twice.. ? Because I just use encoder_encode function and that returns nal units . Im guessing it should be a combination of a parameter and using encoder_encode twice.

    Here is how i initialize params and link to libx264 

        InitializeSettings(){
    x264_param_default_preset(&m_pXParam, "medium", "zerolatency");
    x264_param_apply_profile(&m_pXParam, "baseline");
    m_pXParam.i_width = cx;
    m_pXParam.i_height = cy;
    m_pXParam.i_fps_num = fps;
    m_pXParam.i_fps_den = 1;
    // rate control
    m_pXParam.i_keyint_max = fps - 5;
    //m_pXParam.rc.f_rf_constant_max = fps + 5;
    // rate control
    m_pXParam.rc.i_qp_constant=18;
    m_pXParam.rc.i_qp_min=18;
    m_pXParam.rc.i_qp_max=18;}

    x264_picture_alloc(&m_xPicture, X264_CSP_I420 , m_pXParam.i_width, m_pXParam.i_height);
    m_xPicture.img = x264img;
    m_iframe_size = x264_encoder_encode(m_xEncoder, &m_xNals, &m_iNal, &m_xPicture, &m_xPictureOut);

    @nobody555 Thanks! I had another question about x264_param_apply_fastfirstpass function:

    /* x264_param_apply_fastfirstpass:
 *      If first-pass mode is set (rc.b_stat_read == 0, rc.b_stat_write == 1),
 *      modify the encoder settings to disable options generally not useful on
 *      the first pass. */

    what options are they talking about ?

  • GStreamer x264enc not found

    5 avril 2017, par Dominik Schreiber

    I installed GStreamer-0.10 and all modules (base, good, bad, ugly, ffmpeg) according to these instructions (browse through by clicking prev/next): http://www.linuxfromscratch.org/blfs/view/svn/multimedia/gst-plugins-ugly.html

    Everything seemed to have worked just fine but when I want to execute my pipeline I got this error:

    glib.GError: no element "x264enc"

    Apparently the module was not installed:

    gst-inspect x264enc
No such element or plugin 'x264enc'

    After that I installed the codec by executing:

    sudo apt-get install x264

    This did not work either. So I installed the latest build manually: http://www.videolan.org/developers/x264.html

    After a successful installation of x264 I ran ./configure on the gstreamer-0.10 ugly modules once again and found out about this:

    configure: *** checking feature: x264 plug-in ***
configure: *** for plug-ins: x264 ***
checking for X264... no
configure: No package 'x264' found
configure: *** These plugins will not be built: x264
configure: creating ./config.status

    A check if x264 is available seems to get fullfilled:

    which x264
/usr/local/bin/x264

    I'm using ubuntu server 12.04 LTS. Any ideas what I have to do to compile this module properly? Thanks!

  • GStreamer x264enc not found

    5 avril 2017, par Dominik Schreiber

    I installed GStreamer-0.10 and all modules (base, good, bad, ugly, ffmpeg) according to these instructions (browse through by clicking prev/next): http://www.linuxfromscratch.org/blfs/view/svn/multimedia/gst-plugins-ugly.html

    Everything seemed to have worked just fine but when I want to execute my pipeline I got this error:

    glib.GError: no element "x264enc"

    Apparently the module was not installed:

    gst-inspect x264enc
No such element or plugin 'x264enc'

    After that I installed the codec by executing:

    sudo apt-get install x264

    This did not work either. So I installed the latest build manually: http://www.videolan.org/developers/x264.html

    After a successful installation of x264 I ran ./configure on the gstreamer-0.10 ugly modules once again and found out about this:

    configure: *** checking feature: x264 plug-in ***
configure: *** for plug-ins: x264 ***
checking for X264... no
configure: No package 'x264' found
configure: *** These plugins will not be built: x264
configure: creating ./config.status

    A check if x264 is available seems to get fullfilled:

    which x264
/usr/local/bin/x264

    I'm using ubuntu server 12.04 LTS. Any ideas what I have to do to compile this module properly? Thanks!

  • x264 stream color shift

    15 mars 2017, par useprxf

    I was using swscale + x264 to encode a sequence of RGB images to an h264 stream. When the RGB values in the input image (in red) are all (255, 0, 0), the YUV outputted by swscale + x264 is (81, 90, 240). By using swscale, this YUV value can be transformed back to the original RGB value. However there is color shifting when I used PotPlayer to play the stream.

    I captured the first frame and saved it as a bmp file. The RGB value in the bmp file is (255, 24, 0), where the green channel is not zero.

    How to solve this color-shift problem?

    I solve this problem by changing the ITU-601 color space to ITU-709 using sws_setColorspaceDetails.

  • x264 stream color shift

    15 mars 2017, par useprxf

    I was using swscale + x264 to encode a sequence of RGB images to an h264 stream. When the RGB values in the input image (in red) are all (255, 0, 0), the YUV outputted by swscale + x264 is (81, 90, 240). By using swscale, this YUV value can be transformed back to the original RGB value. However there is color shifting when I used PotPlayer to play the stream.

    I captured the first frame and saved it as a bmp file. The RGB value in the bmp file is (255, 24, 0), where the green channel is not zero.

    How to solve this color-shift problem?

    I solve this problem by changing the ITU-601 color space to ITU-709 using sws_setColorspaceDetails.

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