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• Find out what device to use for capturing with ffmpeg ?

  14 septembre 2013, par wvxvw

  I'm trying to broadcast my screen and I cannot capture audio. There's one complication however. I don't have pulseaudio, and it simply doesn't work on my system, so installing it is out of question. Below is the command I'm trying :

  ffmpeg -f alsa -i ??? -f x11grab -s 1920x1200 -r 15 -i :0.0 \
  
      -acodec pcm_s16le -vcodec libx264 \
  
      -preset fast -pix_fmt yuv420p -s 1280x800 -threads 0 -f flv "$URL"

  Here's the list of my audio devices :

  $ aplay -L
  
  null
  
      Discard all samples (playback) or generate zero samples (capture)
  
  default:CARD=PCH
  
      HDA Intel PCH, ALC269VB Analog
  
      Default Audio Device
  
  sysdefault:CARD=PCH
  
      HDA Intel PCH, ALC269VB Analog
  
      Default Audio Device
  
  front:CARD=PCH,DEV=0
  
      HDA Intel PCH, ALC269VB Analog
  
      Front speakers
  
  surround40:CARD=PCH,DEV=0
  
      HDA Intel PCH, ALC269VB Analog
  
      4.0 Surround output to Front and Rear speakers
  
  surround41:CARD=PCH,DEV=0
  
      HDA Intel PCH, ALC269VB Analog
  
      4.1 Surround output to Front, Rear and Subwoofer speakers
  
  surround50:CARD=PCH,DEV=0
  
      HDA Intel PCH, ALC269VB Analog
  
      5.0 Surround output to Front, Center and Rear speakers
  
  surround51:CARD=PCH,DEV=0
  
      HDA Intel PCH, ALC269VB Analog
  
      5.1 Surround output to Front, Center, Rear and Subwoofer speakers
  
  surround71:CARD=PCH,DEV=0
  
      HDA Intel PCH, ALC269VB Analog
  
      7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
  
  iec958:CARD=PCH,DEV=0
  
      HDA Intel PCH, ALC269VB Digital
  
      IEC958 (S/PDIF) Digital Audio Output
  
  hdmi:CARD=NVidia,DEV=0
  
      HDA NVidia, HDMI 0
  
      HDMI Audio Output
  
  hdmi:CARD=NVidia,DEV=1
  
      HDA NVidia, HDMI 0
  
      HDMI Audio Output
  
  hdmi:CARD=NVidia,DEV=2
  
      HDA NVidia, HDMI 0
  
      HDMI Audio Output
  
  hdmi:CARD=NVidia,DEV=3
  
      HDA NVidia, HDMI 0
  
      HDMI Audio Output

  I know that ??? should be something like hw:X,Y, but maybe it can be something else. I can't find the corresponding entry in the man page.

  As an aside, it would be great if you can suggest another audio codec. I can't find what are the options, and this particular one isn't compatible with FLV because of too high bitrate.

  PS. This is the error I'm getting :

  Could not write header for output file #0 (incorrect codec parameters ?): Invalid data found when processing input

• 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.

  

  

• code for image to video convert in android programmatically ?

  11 juin 2015, par Bipin

  How to create the video from series of png images. Is it possible in android can any body suggest me to do that ?

  I am try For that FFMPEG Library And run sample app using FFMPEG ..
  But I want To the Complete Code To convert sd card Images to Video .