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• feed raw yuv frame to ffmpeg with timestamp

  30 août 2014, par hawk_with_wind

  I’ve trying pipe audio and video raw data to ffmpeg and push realtime stream through RTSP protocol on android.
  the command-line is look like this

  "ffmpeg -re -f image2pipe -vcodec mjpeg -i "+vpipepath
  
  + " -f s16le -acodec pcm_s16le -ar 8000 -ac 1 -i - "
  
  + " -vcodec libx264 "
  
  + " -preset slow -pix_fmt yuv420p -crf 30 -s 160x120 -r 6 -tune film "
  
  + " -g 6 -keyint_min 6 -bf 16 -b_strategy 1 "
  
  + " -acodec libopus -ac 1 -ar 48000 -b:a 80k -vbr on -frame_duration 20 "
  
  + " -compression_level 10 -application voip -packet_loss 20 "
  
  + " -f rtsp rtsp://remote-rtsp-server/live.sdp";

  I’m using libx264 for video codec and libopus for audio codec.
  the yuv frames are feed through a named pipe created by mkfifo, the pcm frames are feed through stdin.

  It works, and I can fetch and play the stream by ffplay. But there is serverely audio/video sync issue. Audio is 5 10 seconds later than video.
  I guess the problem is both yuv frame and pcm frame doesn’t have any timestamp on them. FFmpeg add timestamp when it feed with the data. but audio/video capture thread is impossible to run at the same rate.
  Is there a way to add timestamp to each raw data frame ? (something like PST/DST ?)

  the way I used was from this thread :
  Android Camera Capture using FFmpeg

• avformat/movenc, segafilmenc : Remove unnecessary avio_tell()

  16 janvier 2020, par Andreas Rheinhardt

  avformat/movenc, segafilmenc : Remove unnecessary avio_tell()
  When the faststart option for the mov/mp4 muxer is used, the current
  
  position (i.e. the size of the already written data pre-shifting) was
  
  evaluated twice : First in an initialization and then again later,
  
  overwriting the first value without having ever touched it. So remove
  
  the initialization.
  Also, the clone of this code in the Sega FILM muxer behaves the same and
  
  has been treated the same.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/movenc.c
  • [DH] libavformat/segafilmenc.c

• How to use ffmpeg and javascript for user to add input box inside of a video

  23 janvier 2016, par Donalda Donalda

  I work on my website and the problem i faces is that i cant find a working way to get the chance for a user to drag an input box and set it into video specifying duration for the item.

  so i have a video and a textbox and my problem is when i grag the box i want it to stck to the video and stay there.

  Code is here :

      
  
      
  
      
  
      <code class="echappe-js">&lt;script&gt;<br />
  
          function allowDrop(ev) {<br />
  
              ev.preventDefault();<br />
  
          }<br />
  
  <br />
  
          function drag(ev) {<br />
  
              ev.dataTransfer.setData(&quot;text&quot;, ev.target.id);<br />
  
          }<br />
  
  <br />
  
          function drop(ev) {<br />
  
              ev.preventDefault();<br />
  
              var data = ev.dataTransfer.getData(&quot;text&quot;);<br />
  
              ev.target.appendChild(document.getElementById(data));<br />
  
          }<br />
  
      &lt;/script&gt;