Recherche avancée

Sur d’autres sites (8200)

• unity recorder use at runtime in C#

  5 février 2020, par bluejayke

  I’m using the unity recorder package in the editor, but I wasn’t sure / didn’t see in the docs if its possible to use the unity recorder package to capture video at runtime — meaning after the project is built to webGL etc., can unity record, and perhaps send / stream the video result to a server ? If not how else would this be accomplished ?

• Adding images on both sides of a vertical video using FFmpeg

  7 juin 2016, par John Dakota

  I have a video that I recorded with my phone vertically. When viewing the video on a computer, a large margins on both sides of the video are black. I would like to replace this with an image using FFmpeg.

  I read the section on pads on the FFmpeg docs, but it does not say anything about using images as pads (correct me if I’m wrong), it only mentions using colors.

• 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);