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• injecting id3 tags to mpegts using mpegtsmux with gstreamer

  12 octobre 2020, par igal k

  So I'm trying to demux a .ts file with mpegtsdemux, make some calculations with the elementary streams and re-mux everything back to using the same mpegts container, this works pretty well with the video and audio streams, however im having some difficulties with the data stream(#2) that holds timed_id3 packets. In this case, i simply want to passthrough them as they are untouched, however, neither the deumxer nor the muxer can identify that stream or create the appropriate pads, needless to say, connect the successfully after the pipeline goes from paused to running.

  


  here's the details of my file, extracted using ffmpeg :

  


      Stream #0:0[0x101]: Audio: aac (HE-AAC) ([15][0][0][0] / 0x000F), 48000
Hz, stereo, fltp, 117 kb/s
    Stream #0:1[0x102]: Video: h264 (High) ([27][0][0][0] / 0x001B),
yuv420p(tv, bt709, progressive), 1280x720, Closed Captions, 59.94 fps, 59.94
tbr, 90k tbn, 96k tbc
    Stream #0:2[0x103]: Data: timed_id3 (ID3  / 0x20334449)


  


  so far, I have managed to generate only meta/x-klv caps but that's not what i really need. Any other attempts ended with not-negotiated error or internal stream error.

  


  i have also read that one may request-pads from the muxer, but that also failed.

  


          std::stringstream ss;
        ss << "src_" << streamIdx_;
        gstSrc_ = gst_element_factory_make("appsrc", ss.str().c_str());
        gst_bin_add_many(GST_BIN(pipeline), gstSrc_, nullptr);
        GstPadTemplate* mux_src_pad_template = gst_element_class_get_pad_template(GST_ELEMENT_GET_CLASS(mux), "sink_%d");
        GstCaps* caps = gst_caps_new_simple("private/x-timed_id3", NULL);
        GstPad* pad = gst_element_request_pad(mux, mux_src_pad_template, nullptr, caps);
        
       gboolean success = gst_element_link_pads(gstSrc_, "src", mux, gst_pad_get_name(pad));
            g_object_set(gstSrc_, "format", GST_FORMAT_TIME, nullptr);        
       gst_caps_unref(caps);


  


• How we can capture entire screen screenshot using android application via programming

  18 novembre 2022, par Krunal Indrodiya

  Can anyone having idea how we can capture entire screen screenshot including other application overlay menu and toast using android application programming not for adb commands and manual button press.

  


  I have went through some of the code which is taking screenshot excluding toast and other application overlay displayed on my screen.

  


  Below code is only capturing activity view screenshot not capturing any other app overrlay menu and toast. Mostly because of val v1: View = window.decorView this line.

  


  val mPath: String = context.cacheDir.absolutePath + "/temp_${System.currentTimeMillis()}" + ".png"
// create bitmap screenshot
val v1: View = window.decorView
v1.isDrawingCacheEnabled = true
val bitmap = Bitmap.createBitmap(v1.drawingCache)
v1.isDrawingCacheEnabled = false
val imageFile = File(mPath)
val outputStream = FileOutputStream(imageFile)
val quality = 100
bitmap.compress(Bitmap.CompressFormat.PNG, quality, outputStream)
outputStream.flush()
outputStream.close()


  


  Also try to execute command to capture screenshot via app programming but not get succeed,

  


  val process = Runtime.getRuntime().exec("su")
val os = DataOutputStream(process.outputStream)
val cmd= "exec-out screencap"
os.writeBytes(cmd)
os.close()


  


  Requirement

  


  

  • Listener to identify if any other app displaying overlay menu.

  


  • I would like to capture screenshot when any other application overlay is displayed on my screen and screenshot must contains other application overlay.

  


  


  Please let me know how can i archive this. I really appreciate for your single reply or answer. Thanks in advance.

  


• Shows improper/corrupted TS segments from Opencv webcam and FFmpeg

  30 juin 2020, par playmaker420

  Im experimenting with opencv and ffmpeg to create a live hls stream from the webcam using some scripts

  


  The ffmpeg version i use is 3.4

  


  frame-detection.py

  


  import numpy as np
import cv2
import sys


cap = cv2.VideoCapture(0)

while(True):
    # Capture frame-by-frame
    ret, frame = cap.read()
    framestring = frame.tostring()
    sys.stdout.write(str(framestring))

    # Display the resulting frame
    cv2.imshow('frame', frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()


  


  hlslive_generator.sh

  


  #!/bin/bash

# Create folder from args
mkdir -p $1

# Get into the folder
cd $1

# Start running FFmpeg HLS Live streaming
python frame-detection.py | ffmpeg  \
  -f rawvideo \
  -framerate 10 \
  -video_size 640x480 \
  -i - foo.mp4  \
  -vcodec libx264 \
  -acodec copy \
  -pix_fmt yuv420p \
  -color_range 2 \
  -hls_time 1 \
  -hls_list_size 5 \
  -hls_flags delete_segments \
  -use_localtime 1 \
  -hls_segment_filename '%Y%m%d-%s.ts' \
  ./playlist.m3u8


  


  I used the following commands to run the scripts and it creates a folder and generate ts segments in it

  


  ./hlslive_generator.sh hlssegments


  


  The issue i face here is with the created ts files, on playing these segments with the video player it shows improper/corrupted segments.

  


  Can someone help me to identify the issue ? Thanks in advance