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• FFMPEG picture in picture

  19 février 2016, par Jalyo

  I try to put a portion of video in a video at a certain time.

  Se here’s my command :

  ./ffmpeg-3.0-32bit-static/ffmpeg \
  
  -y \
  
  -i main.mp4 \
  
  -itsoffset -10 \
  
  -i overlay.mp4 \
  
  -filter_complex \
  
  "[1:a] atrim=5:20 [1:a1]; \
  
  [1:a1] adelay=5000|5000 [1:a2]; \
  
  [0:a][1:a2] amix [outa]; \
  
  [1:v] scale=120:-1 [1:v1]; \
  
  [0:v][1:v1] overlay=x=25:y=25:enable='between(t,5,20)'[outv]" \
  
  -map "[outv]" \
  
  -map "[outa]" \
  
  -c:a aac \
  
  -c:v libx264 \
  
  -vb 1000k \
  
  -r 24 \
  
  -strict -2 \
  
  output.mp4

  But I’ve got "Buffer queue overflow, dropping" messages which, I think, makes my overlay.mp4 a little jerky on the output.mp4 :

  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.
  
      Last message repeated 50 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.0.927x
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=2.72x
  
      Last message repeated 33 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=2.72x
  
      Last message repeated 14 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=2.97x
  
      Last message repeated 13 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=3.16x
  
      Last message repeated 35 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=3.35x
  
      Last message repeated 45 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=3.46x
  
      Last message repeated 5 times

  Any idea why ?

  EDIT : Forgot to say I’ve got the last version of ffmpeg => 3.0.

• Error while displaying RTP stream packets from udp port on Gstreamer

  20 octobre 2015, par Gaurav Singla

  I am streaming a live webcam using VLC to darwin streaming server.

  Then tried to play this live web cam feed on RTSP client using following

  GST_DEBUG=2 gst-launch -vvv playbin uri=rtsp ://172.19.91.21/channel.sdp

  Everthing works fine. output is coming on gstreamer window.

  I have reflect all the packest from DSS to RTSP client as well as on a udp_port. But when i tried to play RTP stream using following command

  GST_DEBUG=2 gst-launch-0.10 -vvv udpsrc port=5000 multicast-iface="lo" multicast-group="172.19.91.20" buffer-size=1000000 caps="application/x-rtp, media=video, clock-rate=90000, encoding-name=H264" do-timestamp=false ! rtph264depay ! decodebin ! autovideosink

  I am getting following errors

  0:00:07.108734201 7874 0x89d2a90 ERROR ffmpeg :0: : non-existing PPS referenced
  0:00:07.108803500 7874 0x89d2a90 ERROR ffmpeg :0: : non-existing PPS 0 referenced
  0:00:07.108824183 7874 0x89d2a90 ERROR ffmpeg :0: : decode_slice_header error
  0:00:07.108840903 7874 0x89d2a90 ERROR ffmpeg :0: : no frame !
  0:00:07.108859244 7874 0x89d2a90 WARN ffmpeg gstffmpegdec.c:2299:gst_ffmpegdec_frame : ffdec_h264 : decoding error (len : -1, have_data : 0)

  Please guide me how to solve this problem.

• How to live stream from Windows 10 app to Youtube ?

  12 août 2015, par Boland

  I’m playing around with the YouTube Live Stream API. That’s working fine so far, but the next step is to stream the web cam data to YouTube via RTMP.

  In the (excellent) documentation at Google Dev, it outlines the Life of a Broadcast. However, all steps are documented in detail, except the step I’m interested in :

  Step 3.2 : Start your video

  Start transmitting video on your video stream.

  I was able to use Open Broadcasting Software to stream to a manually created YouTube Live Event, but I have no idea how to do it from my Windows 10 App. I’ve looked at the MediaElement class, and was able to capture the web cam preview in my app. But I can only find methods to save as a file.

  Also found information about FFMPEG, which should probably be able to do the job, but I cannot find a library / DLL to use FFMPEG in my App.

  I just need some guidance where to look next, because now I’m just clueless what to do.

  /edit : I came across MPlatform SDK, which sounds exactly what I want, but it costs $5000.... Not for a hobby :(