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• Undefined reference to av_log

  12 novembre 2017, par Dana Prakoso

  I am cross-compiling FFMPEG source in Linux for Windows using i686-w64-mingw32 using this script :

  ../ffmpeg/configure --disable-ffmpeg --disable-ffprobe --disable-ffplay --disable-shared --enable-static --arch=x86 --target-os=mingw32 --cross-prefix=i686-w64-mingw32- --enable-cross-compile

  And it generates all static library files with extension *.a inside "lib" folder. Then I try to link those libraries with my own source, with this script :

  i686-w64-mingw32-gcc -m32 -c videoplayer.c -o videoplayer.o -w $(INCLUDEDIR) -Wl,--add-stdcall-alias
  
  i686-w64-mingw32-gcc -static -m32 -o libvideoplayer.dll videoplayer.o -Wl,--out-implib,libvideoplayer_dll.lib -Wl,--add-stdcall-alias -L../../ffmpeg/lib -lavdevice -lavformat -lavcodec -lavutil -lwsock32 -lswresample ../../ffmpeg/lib/libWs2_32.lib

  And I got this bunch of error messages :

  ../../ffmpeg/lib/libavformat.a(rtpproto.o): In function `rtp_resolve_host':
  
  /home/dana/Sources/build-ffmpeg/src/libavformat/rtpproto.c:140: undefined reference to `_imp__getaddrinfo@16'
  
  ../../ffmpeg/lib/libavformat.a(rtpproto.o): In function `rtp_parse_addr_list':
  
  /home/dana/Sources/build-ffmpeg/src/libavformat/rtpproto.c:282: undefined reference to `_imp__freeaddrinfo@4'
  
  /home/dana/Sources/build-ffmpeg/src/libavformat/rtpproto.c:277: undefined reference to `_imp__freeaddrinfo@4'
  
  ../../ffmpeg/lib/libavformat.a(tcp.o): In function `tcp_open':
  
  /home/dana/Sources/build-ffmpeg/src/libavformat/tcp.c:112: undefined reference to `_imp__getaddrinfo@16'
  
  /home/dana/Sources/build-ffmpeg/src/libavformat/tcp.c:114: undefined reference to `_imp__getaddrinfo@16'
  
  /home/dana/Sources/build-ffmpeg/src/libavformat/tcp.c:177: undefined reference to `_imp__freeaddrinfo@4'
  
  /home/dana/Sources/build-ffmpeg/src/libavformat/tcp.c:192: undefined reference to `_imp__freeaddrinfo@4'

  How do I resolve this ? Do I miss something in my script ? Big thanks for someone replying.

• FFmpeg, how to skip late input ?

  14 novembre 2017, par user3343357

  I’m running ffmpeg to display incoming stream on a Decklink BlackMagic card with the following command line :

  ffmpeg -y -f ourFmt -probesize 32 -i - -f decklink -preset ultrafast 
  
     -pix_fmt uyvy422 -s 1920x1080 -r 30 -af volume=0.1 -max_delay 10000 
  
       DeckLink Mini Monitor

  Basically I get the video over the internet by UDP and stream it to ffmpeg stdin. Both audio and video streams have pts and dts and are fully in sync, if the connection is good there is no problems.

  However if there are issues with the connection i start getting errors, sometimes the video delay grows significantly, and audio stops working.
  The errors i get are :

  ffmpeg : [decklink @ 0x26cc600] There are not enough buffered video
  frames. Video may misbehave ! ffmpeg : [decklink @ 0x26cc600] There’s no
  buffered audio. Audio will misbehave ! ffmpeg : Last message
  repeated 4 times ffmpeg : [decklink @ 0x26cc600] There are not enough
  buffered video frames. Video may misbehave ! ffmpeg : [decklink @
  0x26cc600] There’s no buffered audio. Audio will misbehave ! ffmpeg :
  Last message repeated 3 times ffmpeg : frame= 5204 fps= 30 q=-0.0
  size=N/A time=00:02:53.76 bitrate=N/A dup=385 drop=5 speed=0.993x
  ffmpeg : [decklink @ 0x26cc600] There’s no buffered audio. Audio will
  misbehave ! ffmpeg : Last message repeated 18 times ffmpeg :
  [decklink @ 0x26cc600] There are not enough buffered video frames.
  Video may misbehave ! ffmpeg : [decklink @ 0x26cc600] There’s no
  buffered audio. Audio will misbehave !

  The problem is when the connection is back to normal, the video keeps misbehaving until I restart the stream. What I want to do is for FFmpeg to skip to the content of the last second and play synchronized video from there, drop all the late data in between, is it possible ?

• ffmpeg : error using image2 demuxer

  14 juin 2014, par mpromonet

  From the image2 demuxer of ffmpeg documentation, creating an MKV file from a set of JPEG pictures seems simple.

  But when I run :

  ffmpeg -v debug -i 'img-%03d.jpeg' out.mkv 

  It fails and reports :

  ffmpeg version 2.1.3 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jun 14 2014 17:40:58 with gcc 4.8 (Debian 4.8.2-15)
  
    configuration: --prefix=/media/DOWNLOAD/ip7000_new/.build/i486-linux-gnu/libroot --enable-static --disable-shared --disable-asm --disable-doc --disable-devices --disable-network --disable-bsfs --disable-protocols --disable-yasm --enable-pic
  
    libavutil      52. 48.101 / 52. 48.101
  
    libavcodec     55. 39.101 / 55. 39.101
  
    libavformat    55. 19.104 / 55. 19.104
  
    libavdevice    55.  5.100 / 55.  5.100
  
    libavfilter     3. 90.100 /  3. 90.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
  Splitting the commandline.
  
  Reading option '-v' ... matched as option 'v' (set logging level) with argument 'debug'.
  
  Reading option '-i' ... matched as input file with argument 'img-%03d.jpeg'.
  
  Reading option 'out.mkv' ... matched as output file.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option v (set logging level) with argument debug.
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input file img-%03d.jpeg.
  
  Successfully parsed a group of options.
  
  Opening an input file: img-%03d.jpeg.
  
  No URL Protocols are registered. Missing call to av_register_all()?
  
      Last message repeated 4 times
  
  [image2 @ 0xa7d0ce0] Could find no file with path 'img-%03d.jpeg' and index in the range 0-4
  
  img-%03d.jpeg: No such file or directory

  I tried with different releases of ffmpeg and behaviour is the same.
  Running it with strace doesnot show any try to open some files, so surely I miss something...