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• Error LIBSWRESAMPLE_0 Compiling ffmpeg Kubuntu 12.04

  30 septembre 2013, par lobo115

  i try to compile ffmpeg in ubuntu 12.04 with this tuto But i had a error with a library so i use this to solve it:

  sudo apt-get update
  sudo apt-get -y install build-essential checkinstall git libfaac-dev libgpac-dev \
    libjack-jackd2-dev libmp3lame-dev libopencore-amrnb-dev libopencore-amrwb-dev \
    libsdl1.2-dev libtheora-dev libva-dev libvdpau-dev libvorbis-dev libx11-dev \
    libxfixes-dev texi2html yasm zlib1g-dev
  

  and this

  cd
  git clone git://git.videolan.org/x264
  cd x264
  ./configure --enable-static
  make
  sudo checkinstall --pkgname=x264 --pkgversion="3:$(./version.sh | \
    awk -F'[" ]' '/POINT/{print $4"+git"$5}')" --backup=no --deldoc=yes \
    --fstrans=no --default
  

  then i have a problem with another library so i use a apt-get install to add libgsm1-dev, then i could install it, but now when i tried to execute it said:

  ffmpeg: relocation error: /usr/local/lib/libavfilter.so.3: symbol swr_get_class, version LIBSWRESAMPLE_0 not defined in file libswresample.so.0 with link time reference
  

  So i look for help, and tried

  export LD_LIBRARY_PATH=/usr/local/lib
  sudo ldconfig -v
  

  but it didn't work, could you help me? Thz

  PS:When i tried to install WINFF with synaptic or apt-get it said that it will install ffmpeg.

• How to add watermark when converting to more than one video with -s option ?

  30 septembre 2013, par user2783132

  I have a problem adding watermark to my video. I'm converting a video into 5 different resolutions using the -s option.

  what I've tried:

  waterMark="\"movie=/watermark.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:10 [out]\""
  
  resolutions=$(echo -e "${resolutions} -s ${newX}x${myY} ${map} -vcodec libx264 ${options} 
  -vf ${waterMark} ${NEW_FILENAME}_${myY}p.mp4")
  
  ffmpeg -i $FILENAME "${resolutions}"
  

  here's the echo of the command: echo "ffmpeg -i $FILENAME $resolutions"

  ffmpeg -i test.mp4  
   -s 1728x720 -map 0:0 -map 0:1 -vcodec libx264 -acodec aac -strict experimental -movflags faststart -vf "movie=/watermark.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:10 [out]" test_720p.mp4 
   -s 1152x480 -map 0:0 -map 0:1 -vcodec libx264 -acodec aac -strict experimental -movflags faststart -vf "movie=/watermark.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:10 [out]" test_480p.mp4 
   -s 864x360 -map 0:0 -map 0:1 -vcodec libx264 -acodec aac -strict experimental -movflags faststart -vf "movie=/watermark.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:10 [out]" test_360p.mp4 
   -s 576x240 -map 0:0 -map 0:1 -vcodec libx264 -acodec aac -strict experimental -movflags faststart -vf "movie=/watermark.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:10 [out]" test_240p.mp4 
   -s 344x144 -map 0:0 -map 0:1 -vcodec libx264 -acodec aac -strict experimental -movflags faststart -vf "movie=/watermark.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:10 [out]" test_144p.mp4
  

  I don't know what the error is, all i'm getting is part of the code in red:

  Metadata:
    handler_name    : VideoHandler
  Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 126 kb/s
  Metadata:
    handler_name    : SoundHandler  
  

  this part in red*

  -s 1728x720 -map 0:0 -map 0:1 -vcodec libx264 -acodec aac -strict experimental -movflags faststart -vf "movie=/watermark.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:10 [out]" test_720p.mp4 -s 1152x480 -map 0:0 -map 0:1 -vcodec libx264 -acodec aac -strict experimental -movflags faststart -vf "movie=/watermark.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:10 [out]" test_480p.mp4 -s 864x360 -map 0:0 -map 0:1 -vcodec libx264 -acodec aac -strict experimental -movflags faststart -vf "movie=/watermark.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:10 [out]" test_360p.mp4 -s 576x240 -map 0:0 -map 0:1 -vcodec libx264 -acodec aac -strict experimental -movflags faststart -vf "movie=/watermark.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:10 [out]" test_240p.mp4 -s 344x144 -map 0:0 -map 0:1 -vcodec libx264 -acodec aac -strict experimental -movflags faststart -vf "movie=/watermark.png [watermark]; [in

  I also tried adding the watermark right after -i $FILENAME

  ffmpeg -i $FILENAME -vf "movie=/watermark.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:10 [out]" $resolutions"
  

  but in that case only the first video comes out with a watermark.

• Save and re-stream RSTP video as straight UDP

  30 septembre 2013, par user1701362

  I am trying to write a program that will connect to a RTSP video source and redirect the video data to another location using UDP. I am also saving the RTSP packets to be able to replay the video stream at a latter moment in time as well. Right now my program can connect to the RTSP video stream and redirect and save, but when I try to look at the redirected video I get nothing using VLC.

  Currently the program just strips out the datagram from the RTSP video packets it receives in its open UDP socket and re-sends them using this code using the boost asio library.

  newVideoSocket->send_to(&dg.data[0], dg.data.size() ,Endpoint);
  

  When I look at the traffic using Wireshark I see that it is actually sending the data to the new address and it is recognized as a UDP packet, but when I try and view the video using VLC nothing happens. The video stream is Mpeg4 with the video encoded as H.264 and VLC can play it.

  I have tried to connect to the redirected stream as UDP and as RTP at both multicast and unicast addresses but have had no success. Do I need to add or take something out of the datagram before I resend it? Or is it something wrong with how I am tring to view it in VLC? Thanks for the help.

• A few questions about running a video gallery site

  30 septembre 2013, par Kevin Kevinz

  my site is going to be hosting a lot of videos. I'm using FFMPEG for all video functions. My current video upload plan is as follows :

  -get input video -make video thumbnail -if its mp4/flv, convert it to ogv (for opera support) -if its not mp4/flv, convert it to mp4 and also convert the original to ogv

  (the file conversions are running in the background)

  I'm using jwPlayer 6 for all videos currently. What can I do to maximize cross-browser and cross-platform support? iOS won't run flv because it can't run flash, so is it worth it to just convert every file to MP4? And what about HTML5 video? Should I consider HTML5 as my primary player and jwPlayer my fallback?

  Thanks everyone.

• How to hide/disable ffmpeg erros when using OpenCV (python) ?

  29 septembre 2013, par Mehran

  I'm using OpenCV python to capture a video. This is my code

  import cv2
  
  cap = cv2.VideoCapture("vid.mp4")
  while True:
      flag, frame =  cap.read()
  
      if not flag:
          cv2.imshow('video', frame)
  
      if cv2.waitKey(10) == 27:
          break
  

  When a frame is not ready it produces an error like this

  

  or

  Truncating packet of size 2916 to 1536
  [h264 @ 0x7ffa4180be00] AVC: nal size 2912
  [h264 @ 0x7ffa4180be00] AVC: nal size 2912
  [h264 @ 0x7ffa4180be00] no frame!
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7ffa41803000] stream 0, offset 0x14565: partial file
  

  I wanted to find a way to hide this error! I guess that this error is being produced by ffmpeg. Is there any way to hide or disable it?

  This error is produced when I call cap.read(). And I also tried to wrap it with try ... except ... but it doesn't work because it doesn't throw any exceptions.