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• HLS Playback Issues on Android with FFMPEG

  25 mai 2014, par Florian

  I am using the FFMPEG built of AppUnite with the latest patch for stagefright support in order to playback http live streams : https://review.appunite.com/#/c/1779/

  As the stream does not start at 0, I added the following code to avoid a black screen :

  struct Player {
  
     + int64_t video_start_time;
  
  }
  
  
  
  void player_get_video_duration(struct Player *player) {
  
  + player->video_start_time = 0;
  
  
  
  + for (i = 0; i < player->capture_streams_no; ++i) {
  
  +    AVStream *stream = player->input_streams[i];
  
  +       if (stream->start_time > 0) {
  
  +          player->video_start_time = av_rescale_q(
  
  +             stream->start_time, stream->time_base, AV_TIME_BASE_Q);
  
  +
  
  +          LOGI(3, "player_set_data_source stream[%d] start_time: %ld",
  
  +             i, player->video_start_time);
  
  +
  
  +           break;
  
  +       }
  
  +   }
  
  }
  
  
  
  enum WaitFuncRet player_wait_for_frame(
  
     struct Player *player, double time, int stream_no) {
  
  - int64_t current_time = av_gettime();
  
  + int64_t current_time = av_gettime() + player->video_start_time; 
  
  }

  However, as soon as the sleep_time in player_wait_for_frame drops below 0, playback freezes and then hangs waiting for a frame that never arrives. The queues allocated by player_alloc_queues function seem being not big enough to hold the real-time stream pushed in between player_open_input and player_start_decoding_threads. Increasing the number of nodes in the queue does not resolve the issue however. The issue seems to be clearly in the player_wait_for_frame method but I am unable to find a solution.

  I spent quite a lot time trying to resolve this nasty issue, but without success so far. Any help really appreciated !!!

• scale issues when adding images to a video

  27 septembre 2019, par Geo

  When I add two images to a video, the second image added is scaled down for some reason.

  I have two images arrow.png and icon1.png and one background.mp4 video, when I added the two images onto the video, the result is that the first image is added with the right size, but the second image is added with reduced size, probably in half of the specified size.

  this is my command :

  ffmpeg -i background.mp4 -i arrow.png -i icon1.png -filter_complex "[1:v]scale=311:175,setsar=1,format=bgra[img1];
  
  [img1]rotate=30*PI/180:c=none:ow=rotw(30*PI/180):oh=roth(30*PI/180)[rotate1];[2:v]scale=319:179,setsar=1,format=bgra[img2];
  
  [img2]rotate=59*PI/180:c=none:ow=rotw(59*PI/180):oh=roth(59*PI/180)[rotate2];[0][rotate1]overlay=242:-22:enable='between(t,0,6)',scale=hd720[overlay1];
  
  [overlay1][rotate2]overlay=34:13:enable='between(t,0,6)',scale=hd720" -c:a copy -c:v libx264 -preset ultrafast -y test01.mp4

  I am expecting the same size as the specified

• FFMPEG DASH Issues

  5 octobre 2022, par user726720

  I have a couple of questions regarding ffmpeg.

  


  


  1. First is i can't seem to get the frame rate correctly.

     


     

     


     I'm expecting 25, i have tried both , both give me the same result.

     


     -r 25 and -filter:v fps=25


     


     Here is my complete command im using

     


     ffmpeg -re -i file.mxf -pix_fmt yuv420p -vsync 1 -map 0:v:0 -map 0:a:0 -c:a aac -c:v libx264 -use_template 1 -use_timeline 1 -init_seg_name  "init-stream$RepresentationID$-$Bandwidth$.mp4" -media_seg_name "chunk-stream$RepresentationID$-$Number%05d$.$ext$" -b:v 2000k -b:a 48k -ac 2 -profile:v main -level:v 3.0 -s 640x360  -filter:v fps=25 -vsync passthrough -increment_tc 1 -adaptation_sets "id=0,streams=v id=1,streams=a" -g 100 -keyint_min 100 -seg_duration 5 -frag_duration 5 -dash_segment_type auto -f dash stream.mpd


     


  


  2. My second question is related to the use of audio, with the above command im acheiving the below results, with the use of AAC

     


     

     


     But my target is to acheive the below, how do i go about this

     


     

     


     

     3. How do i change the muxing mode to dash

     


     


     

     


     Like the below