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• video playing with paperclip ffmpeg

  30 mars 2014, par Ameya Savale

  I've been having problems playing uploaded videos in my ruby on rails app.

  So I am using the paperclip-ffmpeg gem to process my videos when uploaded, and I am able to create a thumbnail of the video but I am not able to play the video. When I right click on the video I am able to download and I can play it using the player on my computer but I am not able to play it in my view. Also when I right click on it the options for "play", "skip", etc. are all blocked. Here is my model :

  class Video < ActiveRecord::Base
  
      has_attached_file :clip, :styles => {
  
              :medium => { :geometry => "640x480", :format => 'flv'},
  
              :thumb => {:geometry => "100x100#", :format => 'jpg', :time => 10}
  
          }, :processors => [:ffmpeg]
  
      do_not_validate_attachment_file_type(:clip)
  
  end

  And here is my view :

  <table class="table">
  
                      <tr>
  
                          <th>Video</th>
  
                          <th>Title</th>
  
                          <th>Caption</th>
  
                      </tr>
  
                      &lt;% @video.each do |video| %>
  
                          <tr>
  
                              <td>
  
                                  &lt;%= image_tag video.clip.url(:thumb) %>
  
                                  &lt;%= video_tag video.clip.url(:medium) %>
  
                              </td>
  
                              <td>
  
                                  &lt;%= label_tag video.title %>
  
                              </td>
  
                              <td>
  
                                  &lt;%= label_tag video.caption %>
  
                              </td>
  
                          </tr>
  
                      &lt;% end %>
  
                  </table>

  I have also tried using the videojs_rails gem but I wasn't able to play the video using that either. I would greatly appreciate it if someone could help me out, I've been searching for an answer everywhere but haven't come across one that has worked for me.

  Thanks in advance

• libavformat/gdv : Fix parsing for soundless video

  2 juillet 2017, par Azamat H. Hackimov

  libavformat/gdv : Fix parsing for soundless video
  Added 2 byte skipping if there no sound present, that fixes playback
  
  files without sound stream.
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/gdv.c

• ffmpeg convert AV_SAMPLE_FMT_S16 to AV_SAMPLE_FMT_FLTP in c++

  12 avril 2020, par easy_breezy

  I want to encode and decode the sound from my Android app to the Opus format using FFmpeg 4.2.2.

  



  The problem is that my Android app provides a raw PCM sound in AV_SAMPLE_FMT_S16 format, but the FFmpeg opus encoder requires only AV_SAMPLE_FMT_FLTP. So, I decided to resample the sound using FFmpeg swr_convert() function but it crashes with SIGSEGV error and I can't understand why.

  



  My code looks like this :

  



  swrContext = swr_alloc();

av_opt_set_int(swrContext, "in_channel_layout", (int64_t) codecContext->channel_layouts, 0);
av_opt_set_int(swrContext, "out_channel_layout", (int64_t) codecContext->channel_layouts,  0);
av_opt_set_int(swrContext, "in_sample_rate", 8000, 0);
av_opt_set_int(swrContext, "out_sample_rate", 48000, 0);

av_opt_set_sample_fmt(swrContext, "in_sample_fmt", AV_SAMPLE_FMT_S16, 0);
av_opt_set_sample_fmt(swrContext, "out_sample_fmt", AV_SAMPLE_FMT_FLTP,  0);

swr_init(swrContext);

memcpy(frame->data[0], data, dataSize); 

uint8_t *outBuffer = (uint8_t *) malloc(sizeof(uint8_t) * frame->nb_samples);

swr_convert(swrContext, &outBuffer, frame->nb_samples, (const uint8_t **)frame->data, frame->nb_samples);


  



  I am new to C++ so sorry for some mistakes if I made them.