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Sur d’autres sites (8001)

  • Encode NV12 frames to h264 using x264enc (appsrc and appsink)

    9 octobre 2023, par Abdul Rehman

    I am trying to encode NV12 frames to h264 files. For that I found a following code that is encoding raw frames to jpeg using jpegenc. The code works fine with jpeg encoder after some minor changes for NV12 frames. However x264enc encode only first frame and the rest of them are outputting the pps error when running with mplayer.

    


    First frame output

    


    [h264 @ 0x7f1ea2ed3600]decoding for stream 0 failed
[lavf] stream 0: video (h264), -vid 0
VIDEO:  [H264]  1920x1080  0bpp  1.000 fps    0.0 kbps ( 0.0 kbyte/s)
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
libavcodec version 58.54.100 (external)
Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264)
==========================================================================
Load subtitles in ./
Audio: no sound
Starting playback...
Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.
VO: [vdpau] 1920x1080 => 1920x1080 Planar YV12


    


    Error frame output :

    


    
[h264 @ 0x7f9c2e44f4c0]non-existing PPS 0 referenced
[h264 @ 0x7f9c2e44f4c0]non-existing PPS 0 referenced
[h264 @ 0x7f9c2e44f4c0]decode_slice_header error

[h264 @ 0x7f9c2eece600]decoding for stream 0 failed
[h264 @ 0x7f9c2eece600]Could not find codec parameters for stream 0 (Video: h264, none): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
[lavf] stream 0: video (h264), -vid 0
VIDEO:  [H264]  0x0  0bpp  25.000 fps    0.0 kbps ( 0.0 kbyte/s)
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
libavcodec version 58.54.100 (external)
Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264)


    


    I have changed the pipeline, block size and added queue.
Pipeline :

    


    pipeline = gst_pipeline_new("mypipeline");
appsrc = gst_element_factory_make("appsrc", "mysource");
queue1 = gst_element_factory_make("queue", "myqueue1");
jpegenc = gst_element_factory_make("x264enc", "myenc");
//parser = gst_element_factory_make("h264parse", "parser");
appsink = gst_element_factory_make("appsink", "mysink");


...
g_object_set(G_OBJECT(appsrc), "format", GST_FORMAT_TIME, "is-live", TRUE, "do-timestamp", TRUE, NULL);
g_object_set(G_OBJECT(jpegenc), "tune", 0x00000004, NULL); // 0x00000004 is the ultrafast preset

...
capsappsrc2Jpegenc = gst_caps_new_simple("video/x-raw", "format",
            G_TYPE_STRING, "NV12", "width", G_TYPE_INT, width, "height",
            G_TYPE_INT, height, "framerate", GST_TYPE_FRACTION, 1, 1, 
            "interlace-mode", G_TYPE_STRING, "progressive",
            "colorimetry", G_TYPE_STRING, "bt601",
            NULL);

    // blocksize is important for jpegenc to know how many data to expect from appsrc in a single frame, too
    char szTemp[64];
    sprintf(szTemp, "%d", 3110400);
    g_object_set(G_OBJECT (appsrc), "blocksize", szTemp,
            NULL);



    


  • mips : intreadwrite : Only execute that code for mips r1 or r2

    25 septembre 2015, par Vicente Olivert Riera
    mips : intreadwrite : Only execute that code for mips r1 or r2

    MIPS R6 supports unaligned memory access and does not have
    
the load/store-left/right family of instructions.
    

    Signed-off-by : Vicente Olivert Riera <Vincent.Riera at imgtec.com>
    
Signed-off-by : Luca Barbato <lu_zero at gentoo.org>
    
Signed-off-by : Luca Barbato <lu_zero@gentoo.org>
    • [DBH] libavutil/mips/intreadwrite.h

  • lavu/random_seed : use arc4random() when available

    7 décembre 2015, par Ganesh Ajjanagadde
    lavu/random_seed : use arc4random() when available

    arc4random() was designed as a superior interface for system random
    
number generation, designed for OpenBSD and subsequently incorporated by
    
other BSD’s, Mac OS X, and some non-standard libc’s. It is thus an improvement to
    
use it whenever available.
    

    As a side note, this may or may not get included in glibc, and there is
    
a proposal to create a posix_random family based on these ideas :
    
http://austingroupbugs.net/view.php?id=859.
    

    Tested on Mac OS X.
    

    Signed-off-by : Ganesh Ajjanagadde <gajjanagadde@gmail.com>
    • [DH] configure
    • [DH] libavutil/random_seed.c

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