Recherche avancée

Sur d’autres sites (10957)

• MPEG DASH : Playing video segments from .m4s files instead of byte ranges in the MPD File using Simple DASH Player

  1er novembre 2018, par Trycoder

  I have followed the tutorial from the link below to create an MPEG DASH player using HTML5 and javascript.
  Building a simple MPEG dash player using HTML5 and JS.

  In the given tutorial, it is possible to play the video segments using byte ranges. But for my application, I need the following features.

  1. The video player should read the .m4s segment files and play the video instead of byte ranges.
  2. The amount of data in the MediaSource buffer should be calculated periodically, also the amount of space left in the buffer.

  Are these possible in the given player or Is there a better MPEG DASH Player with the above features ?

  PS : The MPD File is created using FFmpeg.

  ffmpeg  -f  avfoundation -video_size 1280x720 -framerate 30 -i 0 -vcodec libx264  -acodec aac  -b:v 800k  -f dash  -use_template 0  -min_seg_duration 4000 -single_file 1  -start_at_zero -live 1  ffmpeg.mpd

  Also, I tried using the DASH.js player but the documentation is very vast in it. Can we get the size of the source buffer in dash.js (The space available in the source buffer and also the amount of space filled) ? This is the main feature which is required for my project.

  Edit :
  Code which I tried

• A query on ffmpeg's DASH muxer and setting timeShiftBufferDepth values in MPEG-DASH Media Presentation Description (MPD) files

  18 février 2019, par 林正浩

  The documentation for the webm_dash_manifest muxer mentions the time_shift_buffer_depth option, defined as "Smallest time (in seconds) shifting buffer for which any Representation is guaranteed to be available. "

  What’s the equivalent option/setting for the same in the dash muxer (,if implemented) ?

  Documentation for the webm_dash_manifest muxer

• Android Samsung Galaxy S2 / S3 device bitmap rendering to ImageView issue

  18 décembre 2014, par Steve

  I am stuck in a very strange Bitmap rendering issue with Samsung Android devices. Let me discuss in brief what I have done.

  I am taking frame from a video and rendering it in a ImageView using ffmpeg. Following code gives me a bitmap object in return from JNI callback.

      img_convert_ctx = sws_getContext(pCodecCtx->width,
  
              pCodecCtx->height, pCodecCtx->pix_fmt, target_width,
  
          target_height, PIX_FMT_RGB24, SWS_BICUBIC, NULL, NULL,NULL);
  
  
  
      sws_scale(img_convert_ctx,(const uint8_t* const *) 
  
          pFrame->data,pFrame->linesize, 0, pCodecCtx->height,pFrameRGB->data, 
  
  pFrameRGB->linesize);

  Next, I’m just setting the Bitmap to ImageView. Now the issue is the Bitmap I get is rendering very well in maximum devices except Samsung S2/S3.

  A>Working well In :- Screen Shot 1

  1. Nexus 4
  2. HTC One / HTC One x
  3. LG Optimus
  4. Sony Experia
  5. Samsung Galaxy S Plus / Samsung Exhibit (Android 2.3)

  Issue With :-
  B>Samsung Galaxy S2 & S3 : The second screen shot.

  For Case B, A part of the video is rendering at the right side if you notice.

  I have tried saving the Bitmap I get from JNI as jpg in SD card and read that again to set the ImageView and it works. I Don’t understand what is going wrong with the raw Bitmap that I get from JNI callback, is it with Samsung S2 Hardware ? Please someone help me on this.