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• FFMPEG - subtitles not showing for the full duration of video

  26 juin 2023, par Caio Maia

  I could not archive the following :

  


  

  1. Have images loaded from a textfile to create a slideshow.

  


  2. Have a background music with volume control.

  


  3. Have my voice.mp3 over the bg music.

  


  4. Have subtitles in the ass format.

  


  5. Have a text shown with drawtext in the full duration of video.

  


  6. in only one command, if possible.

  


  


  The command I tryed is :

  


  ffmpeg.exe -f concat -i images.txt -i bg_music.m4a -i voice.mp3 -filter_complex "[0:v]drawtext=fontfile='fonte.TTF':fontsize=20:fontcolor=white:text='Imagens da internet':x=w-tw-10:y=h-th-10,[0]overlay=10:10,ass=subtitles.txt[out],[1]volume=0.3[a1];[2]volume=2[a2];[a1][a2]amix=inputs=2:duration=shortest[aud]" -map "[out]" -map "[aud]":a -pix_fmt yuv420p -c:v libx264 -c:s mov_text -r 30 -y out.mp4


  


  It works but not for subtitles that are showing only after the first image of th slideshow appears.

  


  the content of images.txt is :

  


  file 'image1.png'
duration 20
file 'image2.png'
duration 5
file 'image3.png'
duration 5


  


  the content of subtitles.txt is

  


  Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:01.00,0:00:06.00,Default,,0,0,0,,Subscribe!
Dialogue: 0,0:00:07.00,0:00:16.00,Default2,,0,0,0,,Like!
Dialogue: 0,0:00:17.00,0:00:26.00,Default,,0,0,0,,Share!


  


  The problem is that only the "Share !" text is shown.

  


• Revision 9bd3be69a4 : Adjust full-pixel search method in real-time mode Use FAST_HEX in speed 5 and 6

  8 juillet 2014, par Yunqing Wang

  Changed Paths :
   Modify /vp9/encoder/vp9_speed_features.c

  
  
  Adjust full-pixel search method in real-time mode

  Use FAST_HEX in speed 5 and 6, which covers more points than
  FAST_DIAMOND and improves motion search quality.

  At speed 6, RTC set borg tests showed slight quality gain (psnr
  gain : 0.143%, ssim gain : 0.226%). No noticeable encoding speed
  change.

  Change-Id : Ifa62875d9a52ee382ec494f271382bb77d8c67bf

• converting images to mp4 using ffmpeg on iphone

  29 novembre 2011, par user633901

  Up till now, i can create mpeg1 but with no luck for mp4.Maybe we can talk and share information.Someone told me that i have to set some flags for using mp4.But i am stuck at using it...

  following is the working code :

  av_register_all();
  
  printf("Video encoding\n"); 
  
  
  
  /// find the mpeg video encoder 
  
  //codec=avcodec_find_encoder(CODEC_ID_MPEG1VIDEO); 
  
  codec = avcodec_find_encoder(CODEC_ID_MPEG4); 
  
  
  
  if (!codec) { 
  
      fprintf(stderr, "codec not found\n"); 
  
      exit(1); 
  
  } 
  
  
  
  c = avcodec_alloc_context(); 
  
  picture = avcodec_alloc_frame(); 
  
  
  
  // put sample parameters 
  
  c->bit_rate = 400000;
  
  /// resolution must be a multiple of two 
  
  c->width = 240; 
  
  c->height = 320; 
  
  //c->codec_id = fmt->video_codec;
  
  //frames per second 
  
  c->time_base= (AVRational){1,25}; 
  
  c->gop_size = 10; /// emit one intra frame every ten frames 
  
  c->max_b_frames=1; 
  
  c->pix_fmt =PIX_FMT_YUV420P; // PIX_FMT_YUV420P
  
  
  
  if (avcodec_open(c, codec) < 0) { 
  
      fprintf(stderr, "could not open codec\n"); 
  
      exit(1); 
  
  }
  
  
  
  f = fopen([[NSHomeDirectory() stringByAppendingPathComponent:@"test.mp4"] UTF8String], "wb"); 
  
  
  
  if (!f) { 
  
      fprintf(stderr, "could not open %s\n",[@"test.mp4" UTF8String]); 
  
      exit(1); 
  
  } 
  
  
  
  // alloc image and output buffer 
  
  outbuf_size = 100000; 
  
  outbuf = malloc(outbuf_size); 
  
  size = c->width * c->height; 
  
  
  
  #pragma mark - 
  
  
  
  AVFrame* outpic = avcodec_alloc_frame(); 
  
  int nbytes = avpicture_get_size(PIX_FMT_YUV420P, c->width, c->height); //this is half size of numbytes. 
  
  
  
  //create buffer for the output image 
  
  uint8_t* outbuffer = (uint8_t*)av_malloc(nbytes); 
  
  
  
  #pragma mark -  
  
  for(k=0;k<1;k++) { 
  
      for(i=0;i<25;i++) { 
  
          fflush(stdout); 
  
  
  
          int numBytes = avpicture_get_size(PIX_FMT_RGBA, c->width, c->height); 
  
          uint8_t *buffer = (uint8_t *)av_malloc(numBytes*sizeof(uint8_t)); 
  
  
  
          UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"%d.png", i+1]]; 
  
          CGImageRef newCgImage = [image CGImage]; 
  
  
  
          CGDataProviderRef dataProvider = CGImageGetDataProvider(newCgImage); 
  
          CFDataRef bitmapData = CGDataProviderCopyData(dataProvider); 
  
          buffer = (uint8_t *)CFDataGetBytePtr(bitmapData);   
  
          /////////////////////////// 
  
          //outbuffer=(uint8_t *)CFDataGetBytePtr(bitmapData); 
  
          ////////////////////////// 
  
          avpicture_fill((AVPicture*)picture, buffer, PIX_FMT_RGBA, c->width, c->height); 
  
          avpicture_fill((AVPicture*)outpic, outbuffer, PIX_FMT_YUV420P, c->width, c->height);//does not have image data. 
  
  
  
          struct SwsContext* fooContext = sws_getContext(c->width, c->height, 
  
                                                        PIX_FMT_RGBA, 
  
                                                        c->width, c->height, 
  
                                                        PIX_FMT_YUV420P, 
  
                                                        SWS_FAST_BILINEAR, NULL, NULL, NULL); 
  
  
  
          //perform the conversion 
  
          sws_scale(fooContext, picture->data, picture->linesize, 0, c->height, outpic->data, outpic->linesize); 
  
          // Here is where I try to convert to YUV 
  
  
  
          // encode the image 
  
          out_size = avcodec_encode_video(c, outbuf, outbuf_size, outpic); 
  
          printf("encoding frame %3d (size=%5d)\n", i, out_size); 
  
          fwrite(outbuf, 1, out_size, f); 
  
  
  
          free(buffer); 
  
          buffer = NULL;
  
      }
  
  
  
      // get the delayed frames 
  
      for(; out_size; i++) { 
  
          fflush(stdout); 
  
  
  
          out_size = avcodec_encode_video(c, outbuf, outbuf_size, NULL); 
  
          printf("write frame %3d (size=%5d)\n", i, out_size); 
  
          fwrite(outbuf, 1, outbuf_size, f);       
  
      } 
  
  }
  
  
  
  // add sequence end code to have a real mpeg file 
  
  outbuf[0] = 0x00; 
  
  outbuf[1] = 0x00; 
  
  outbuf[2] = 0x01; 
  
  outbuf[3] = 0xb7; 
  
  fwrite(outbuf, 1, 4, f); 
  
  fclose(f); 
  
  free(picture_buf);
  
  free(outbuf); 
  
  
  
  avcodec_close(c); 
  
  av_free(c); 
  
  av_free(picture); 
  
  //av_free(outpic); 
  
  printf("\n"); 

  my msn:hieeli@hotmail.com