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• How to receive Mpeg-ts stream over UDP from FFMpeg in Java

  11 juin 2020, par Steve Glick

  I have a live video stream from FFMpeg, and I am having a hard time viewing the stream using my own custom Java application. Before someone tells me to use VLC or something like that I do want to use my own application. The stream I am trying to read is a H.264 encoded Mpeg-ts stream streamed over UDP. I do know how to decode the H.264 frames, but I am simply wondering about how to receive the Mpeg-ts stream.

  


• The FFmpeg-generated video mute after seeking it forward [closed]

  16 septembre 2022, par PersianMan

  The video mutes after seeking it forward. It was created with FFmpeg. When I play it normally (without seeking it), the audio played. I am a Linux user and test it with VLC media player and mpv.

  


  I generated it with this :

  


  ffmpeg  -i video.flv -i audio1.flv -i audio2.flv -i audio3.flv -i audio4.flv -i audio5.flv  -i audio6.flv  -i audio7.flv  -i audio8.flv  \
-filter_complex "\
[0:v]tpad=start_duration=29.429[v];\
[1:a]adelay=3654.0[a1];\
[2:a]adelay=53563.0[a2];\
[3:a]adelay=1148851.0[a3];\
[4:a]adelay=1313774.0[a4];\
[5:a]adelay=1373197.0[a5];\
[6:a]adelay=2061735.0[a6];\
[7:a]adelay=2736617.0[a7];\
[8:a]adelay=3387278.0[a8];\
[a1][a2][a3][a4][a5][a6][a7][a8]amix=inputs=8[a]"\
 -map "[v]"  -map "[a]"  -c:v libx264 -crf 23 -c:a mp3 -s 500x500 -shortest ./output.flv


  


  [1:a] and [5:a] is a main audio (other audio have small duration). If I seek after 1373197.0 ms, the video has been muted (when [5:a] must be played).

  


• video frames render slow using opengl and ffmpeg in iphone

  17 février 2012, par resident_

  I'm developing an video player for iPhone. I'm using ffmpeg libraries to decode frames of video and I'm using opengl 2.0 to render the frames to the screen.

  But my app is very slow render the frames and some videos played slowly.

  I have played AVI, MOV, FLV, MP4 and WMV, and only several AVI files are correct played.

  I don't have much idea of ffmpeg and opengl, and I have used a tutorials and examples until now. But I think that the problem can be two things :

  1. The render method is very slowly. I don't use correctly the glTexSubImage2D function.

  2. I don't scale the frames correctly. I don't use correctly the sws_getContext function.

  I'm here parts of my code, to see if anyone can help me.

  So I use sws_getContext

   ctx->p_sws_ctx = sws_getContext(ctx->p_video_ctx->width, 
  
                                  ctx->p_video_ctx->height, 
  
                                  ctx->p_video_ctx->pix_fmt, 
  
                                  ctx->p_video_ctx->width, 
  
                                  ctx->p_video_ctx->height,
  
                                  PIX_FMT_RGB565, SWS_FAST_BILINEAR, NULL, NULL, NULL);
  
  
  
  
  
  
  
  
  
  // Framebuffer for RGB data
  
  ctx->p_frame_buffer = malloc(avpicture_get_size(PIX_FMT_RGB565,
  
                                                  ctx->p_video_ctx->width, 
  
                                                  ctx->p_video_ctx->height));
  
  
  
  avpicture_fill((AVPicture*)ctx->p_picture_rgb, ctx->p_frame_buffer, PIX_FMT_RGB565, 
  
                 ctx->p_video_ctx->width, 
  
                 ctx->p_video_ctx->height);

  My render method of opengl 2.0

  - (void) render: (uint8_t*) buffer

  [EAGLContext setCurrentContext:context] ;

  glBindFramebuffer(GL_FRAMEBUFFER, defaultFramebuffer);
  
  glViewport(0, 0, backingWidth, backingHeight);
  
  
  
  glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
  
  
  
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  
  
  
  // OpenGL loads textures lazily so accessing the buffer is deferred until draw; notify
  
  // the movie player that we're done with the texture after glDrawArrays.          
  
  glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, mFrameW, mFrameH, GL_RGB,GL_UNSIGNED_SHORT_5_6_5, buffer);
  
  
  
  glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
  
  
  
  
  
  [moviePlayerDelegate bufferDone];
  
  
  
  glBindRenderbuffer(GL_RENDERBUFFER, colorRenderbuffer);
  
  [context presentRenderbuffer:GL_RENDERBUFFER];

  Someone, can I Help me ?

  Thanks,