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Sur d’autres sites (14024)

  • Libav linking error : undefined references

    22 février 2017, par Fedech

    Here’s my problem :

    • I built ffmpeg from source (version 1.2), the libav* libraries are in /usr/local/lib and they’re static
    • I’m compiling a ns3 (www.nsnam.org) module, so my only control over the linker is through the env variable LINKFLAGS
    • In the source the headers are in a "extern C" block, so it’s not the usual g++ name mangling
    • I set LINKFLAGS="-I/usr/local/include/libavformat -I/usr/local/include/libavcodec -I/usr/local/include/libavutil -L/usr/local/lib -lavformat -lavcodec -lavutil", and the linker can’t seem to find any of the libav* functions I call (I get a lot of "undefined reference" and then "collect2 : error : ld returned status 1"

    Can anyone help me ? Thanks...

    edit : here are a few of the undefined reference messages :

        ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_guess_format'
    
    ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_read_frame'
    
    ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `avformat_write_header'
    
    ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_interleaved_write_frame'
    
    ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_find_stream_info'
    
    ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_register_all'
    
    ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_init_packet'
    
    ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `avformat_alloc_context'
    
    ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_dump_format'
    
    ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `avio_close'

    edit2 : here is the message I get after "build failed" :

    -> task in 'scratch-simulator' failed (exit status 1): 
    
{task 53952272: cxxprogram scratch-simulator.cc.1.o -> scratch-simulator}
    
['/usr/bin/g++', '-I/usr/local/include/libavcodec', '-I/usr/local/include/libavformat/',
    
 '-I/usr/local/include/libavutil/', '-L/usr/local/lib', '-I/usr/local
    
/include/libavcodec', '-I/usr/local/include/libavformat/', '-I/usr/local/include
    
/libavutil/', '-L/usr/local/lib', '-pthread', '-pthread', '-Wl,-z,relro', 
    
'scratch/scratch-simulator.cc.1.o', '-o', '/home/fede/Thesis/ns-allinone-3.14.1
    
/ns-3.14.1/build/scratch/scratch-simulator', '-Wl,-Bstatic', '-Wl,-Bdynamic', 
    
'-Wl,--no-as-needed', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.',
    
 '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.',
    
 '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', 
    
'-L.', '-L.', '-L.', '-L.', '-L.', '-L/usr/lib', '-lns3.14.1-test-debug', '-lns3.14.1-
    
csma-layout-debug', '-lns3.14.1-point-to-point-layout-debug', '-lns3.14.1-netanim-
    
debug', '-lns3.14.1-lte-debug', '-lns3.14.1-spectrum-debug', '-lns3.14.1-antenna-
    
debug', '-lns3.14.1-aodv-debug', '-lns3.14.1-dsdv-debug', '-lns3.14.1-dsr-debug', 
    
'-lns3.14.1-mesh-debug', '-lns3.14.1-olsr-debug', '-lns3.14.1-csma-debug', '-lns3.14.1-
    
wimax-debug', '-lns3.14.1-applications-debug', '-lns3.14.1-virtual-net-device-debug', 
    
'-lns3.14.1-uan-debug', '-lns3.14.1-energy-debug', '-lns3.14.1-flow-monitor-debug', 
    
'-lns3.14.1-nix-vector-routing-debug', '-lns3.14.1-tap-bridge-debug', '-lns3.14.1-
    
visualizer-debug', '-lns3.14.1-internet-debug', '-lns3.14.1-bridge-debug', '-lns3.14.1-
    
point-to-point-debug', '-lns3.14.1-mpi-debug', '-lns3.14.1-wifi-debug', '-lns3.14.1-
    
buildings-debug', '-lns3.14.1-propagation-debug', '-lns3.14.1-mobility-debug', 
    
'-lns3.14.1-config-store-debug', '-lns3.14.1-tools-debug', '-lns3.14.1-stats-debug',
    
 '-lns3.14.1-emu-debug', '-lns3.14.1-topology-read-debug', '-lns3.14.1-network-debug', 
    
'-lns3.14.1-qoe-monitor-debug', '-lns3.14.1-core-debug', '-lrt', '-lgsl', 
    
'-lgslcblas', '-lm', '-ldl', '-lgtk-x11-2.0', '-lgdk-x11-2.0', '-latk-1.0', 
    
'-lgio-2.0', '-lpangoft2-1.0', '-lpangocairo-1.0', '-lgdk_pixbuf-2.0', '-lcairo', 
    
'-lpango-1.0', '-lfreetype', '-lfontconfig', '-lgobject-2.0', '-lglib-2.0', '-lxml2', 
    
'-lpython2.7']

  • Damaged h264 stream not working with ffmpeg but working with vlc or mplayer

    15 avril 2013, par gregoiregentil

    I have a h264 file, coming from an rtsp stream, that is slightly damaged. Some frames are altered.

    ffmpeg reports :

    ffmpeg -i stream.mpg 
    
ffmpeg version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
    
  built on Apr  2 2013 17:00:59 with gcc 4.6.3
    
*** THIS PROGRAM IS DEPRECATED ***
    
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
    

    
Seems stream 0 codec frame rate differs from container frame rate: 180000.00 (180000/1) -> 90000.00 (180000/2)
    
Input #0, mpegts, from 'a.mpg':
    
  Duration: 00:03:18.84, start: 93370.745522, bitrate: 2121 kb/s
    
  Program 1 
    
    Stream #0.0[0x44](): Video: h264 (Baseline), yuv420p, 640x480, 90k tbr, 90k tbn, 180k tbc
    
At least one output file must be specified

    I can play the file with VLC or mplayer. Obviously, the damaged frames are "kind of blurred" but it's working. mplayer reports :

    mplayer stream.mpg
    
MPlayer2 UNKNOWN (C) 2000-2011 MPlayer Team
    
mplayer: could not connect to socket
    
mplayer: No such file or directory
    
Failed to open LIRC support. You will not be able to use your remote control.
    

    
Playing stream.mpg.
    
Detected file format: MPEG-2 transport stream format (libavformat)
    
[lavf] stream 0: video (h264), -vid 0
    
LAVF: Program 1 
    
VIDEO:  [H264]  640x480  0bpp  90000.000 fps    0.0 kbps ( 0.0 kbyte/s)
    
Load subtitles in .
    
[ass] auto-open
    
==========================================================================
    
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
    
Asking decoder to use 2 threads if supported.
    
Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264)
    
==========================================================================
    
Audio: no sound
    
Starting playback...
    
V:   0.0   0/  0 ??% ??% ??,?% 0 0 
    
Movie-Aspect is undefined - no prescaling applied.
    
VO: [xv] 640x480 => 640x480 Planar YV12 
    
V:93370.7   0/  0 ??% ??% ??,?% 0 0 
    
No pts value from demuxer to use for frame!
    
Video pts after filters MISSING
    
V:93370.7   0/  0 ??% ??% ??,?% 0 0 
    
No pts value from demuxer to use for frame!
    
Video pts after filters MISSING
    
V:93370.7   0/  0 ??% ??% ??,?% 0 0 
    
No pts value from demuxer to use for frame!
    
Video pts after filters MISSING
    
V:93370.7   0/  0 ??% ??% ??,?% 0 0 
    
No pts value from demuxer to use for frame!
    
Video pts after filters MISSING
    
V:93370.7   0/  0 ??% ??% ??,?% 0 0 
    
No pts value from demuxer to use for frame!
    
Video pts after filters MISSING
    
V:93370.7   0/  0 ??% ??% ??,?% 0 0 
    
No pts value from demuxer to use for frame!
    
Video pts after filters MISSING
    
V:93370.7   0/  0 ??% ??% ??,?% 0 0 
    
No pts value from demuxer to use for frame!

    When I try to re-encode the file with :

    ffmpeg -i stream.mpg -fflags +genpts -an -vcodec mpeg4 -r 65535/2733 stream.mp4

    ffmpeg seems to jump over the altered frames. The length of stream.mp4 << length of stream.mpg

    How could I fix this problem, i.e. having ffmpeg to output something similar to what mplayer and vlc output ?

  • FFmpeg returning an error - What does it mean ?

    19 mars 2013, par user1031947

    I am using FFmpeg, libmp3lame & libx264 along with the node fluent-ffmpeg module. This is my first foray into processing uploaded videos.

    From node, I use the following code to process an uploaded video :

    var proc = new ffmpeg({ source: src, nolog: true })
    
    .usingPreset( "podcast" )
    
    .withAudioCodec( "libmp3lame" )
    
    .saveToFile( dest, function( retcode, err ){
    
         if( err ) throw err;
    
         ...
    
    });

    When I try to process a video, this fails with the following error, which I don't understand. I am hoping someone here can help point me in the right direction. Thanks !

    > ffmpeg version 0.8.5-6:0.8.5-1, Copyright (c) 2000-2012 the Libav
    
> developers   built on Jan 13 2013 12:05:48 with gcc 4.7.2
    
> *** THIS PROGRAM IS DEPRECATED *** This program is only provided for compatibility and will be removed in a future release. Please use
    
> avconv instead.
    
> 
    
> Seems stream 0 codec frame rate differs from container frame rate:
    
> 5994.00 (5994/1) -> 29.97 (2997/100) Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
    
> &#39;/home/ssp/resources/tmp/32111bf4217e87c23328ec81c56c7d02&#39;:  
    
> Metadata:
    
>     major_brand     : M4VP
    
>     minor_version   : 1
    
>     compatible_brands: M4VPM4A mp42isom
    
>     creation_time   : 2008-08-26 17:28:47   Duration: 00:00:08.01, start: 0.000000, bitrate: 944 kb/s
    
>     Stream #0.0(eng): Video: h264 (Constrained Baseline), yuv420p, 480x272, 815 kb/s, 29.97 fps, 29.97 tbr, 2997 tbn, 5994 tbc
    
>     Metadata:
    
>       creation_time   : 2008-08-26 17:28:47
    
>     Stream #0.1(eng): Audio: aac, 44100 Hz, stereo, s16, 124 kb/s
    
>     Metadata:
    
>       creation_time   : 2008-08-26 17:28:47 [buffer @ 0xb685a0] w:480 h:272 pixfmt:yuv420p [scale @ 0xb63280] w:480 h:272 fmt:yuv420p ->
    
> w:320 h:176 fmt:yuv420p flags:0x4 [libx264 @ 0xb67c20] VBV maxrate
    
> unspecified, assuming CBR [libx264 @ 0xb67c20] using cpu capabilities:
    
> MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 AVX [libx264 @ 0xb67c20]
    
> profile Main, level 1.3 Output #0, m4v, to
    
> &#39;/home/ssp/resources/users/11/026468c8f4ea1beee0a585ebc2208137.m4v&#39;:  
    
> Metadata:
    
>     major_brand     : M4VP
    
>     minor_version   : 1
    
>     compatible_brands: M4VPM4A mp42isom
    
>     creation_time   : 2008-08-26 17:28:47
    
>     encoder         : Lavf53.21.1
    
>     Stream #0.0(eng): Video: libx264, yuv420p, 320x176, q=10-51, 512 kb/s, 90k tbn, 29.97 tbc
    
>     Metadata:
    
>       creation_time   : 2008-08-26 17:28:47
    
>     Stream #0.1(eng): Audio: libmp3lame, 44100 Hz, 1 channels, s16, 128 kb/s
    
>     Metadata:
    
>       creation_time   : 2008-08-26 17:28:47 Stream mapping:   Stream #0.0 -> #0.0   Stream #0.1 -> #0.1 Press ctrl-c to stop encoding frame=  240 fps=154 q=11.0 Lsize=     642kB time=7.97 bitrate=
    
> 659.3kbits/s     video:516kB audio:126kB global headers:0kB muxing overhead 0.000000% frame I:1     Avg QP:15.35  size:  9995 [libx264 @
    
> 0xb67c20] frame P:77    Avg QP:13.25  size:  5419 [libx264 @ 0xb67c20]
    
> frame B:162   Avg QP:18.31  size:   625 [libx264 @ 0xb67c20]
    
> consecutive B-frames:  2.5% 12.5% 30.0% 55.0% [libx264 @ 0xb67c20] mb
    
> I  I16..4:  9.1%  0.0% 90.9% [libx264 @ 0xb67c20] mb P  I16..4:  2.1% 
    
> 0.0%  2.8%  P16..4: 18.0% 29.9% 44.8%  0.0%  0.0%    skip: 2.3% [libx264 @ 0xb67c20] mb B  I16..4:  0.1%  0.0%  0.0%  B16..8: 35.2%
    
> 20.2%  1.9%  direct:14.5%  skip:28.1%  L0:26.3% L1:38.1% BI:35.6% [libx264 @ 0xb67c20] coded y,uvDC,uvAC intra: 83.7% 91.7% 84.7% inter:
    
> 27.7% 43.4% 13.9% [libx264 @ 0xb67c20] i16 v,h,dc,p: 20% 29% 42%  9% [libx264 @ 0xb67c20] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 29% 20%  4% 
    
> 8%  6%  9%  3%  4% [libx264 @ 0xb67c20] i8c dc,h,v,p: 60% 19% 16%  5%
    
> [libx264 @ 0xb67c20] Weighted P-Frames: Y:2.6% UV:0.0% [libx264 @
    
> 0xb67c20] ref P L0: 75.6% 13.5%  8.0%  2.8%  0.1% [libx264 @ 0xb67c20]
    
> ref B L0: 94.5%  5.5% [libx264 @ 0xb67c20] kb/s:528.00

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