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  • Existing and linked shared object file cannot be opened : not found

    27 décembre 2014, par Ruben

    I cross-compiled ffmpeg (v 2.5) for my raspberry pi (Raspbian) on Ubuntu (64bit) with crosstool-ng (armv6, 32bit, little endian) with shared-flag enabled and transferred the binaries (ffmpeg, ffserver and ffprobe) and libraries to /usr/local/bin respectively /usr/local/lib on my pi (following this instruction : https://trac.ffmpeg.org/wiki/CompilationGuide/RaspberryPi). ffmpeg works fine, I tested it by recoding a mp3 file to wav. However, when trying to import a library, that requires libavutil.so.54, for example by executing

    python -c 'import musicplayer'

    I get the message :

    libavutil.so.54: cannot open shared object file: No such file or directory

    Did not seem to be a big problem, I added the line :

    include /usr/local/bin

    to the ldconfig file and reconfigured ld.
    Executing

    ldconfig -p | grep libavutil

    shows, that the so-files are linked successfully. Nevertheless, libavutil.so.54 still cannot be accessed, the error remains. Even adding the path to LD_LIBRARY_PATH does not help. When trying to link directly to the so-file via LD_PRELOAD, the output is :

    ERROR: ld.so: object '/usr/local/lib/libavutil.so.54' from LD_PRELOAD cannot be preloaded, ignored

    The next step was to check the permissions, but I could not find any wrong setting.

    I am kind of stumped. Is there a possibility to check, whether libavutil works fine ?

    Any help would be greatly appreciated !

    Maybe the output of ldconfig -v (relevant sections) helps :

    pi@raspberrypi ~ $ sudo /sbin/ldconfig -v                    
    
/sbin/ldconfig: Pfad »/lib/arm-linux-gnueabihf« mehrfach angegeben
    
/sbin/ldconfig: Pfad »/usr/lib/arm-linux-gnueabihf« mehrfach angegeben
    
    ...
    
/sbin/ldconfig: /lib/arm-linux-gnueabihf/ld-2.13.so is the dynamic linker, ignoring
    

    
    ...
    
/usr/lib/arm-linux-gnueabihf:
    
    ...
    
    libavutil.so.52 -> libavutil.so.52.3.0
    
    ...
    
    libavutil.so.51 -> libavutil.so.51.22.2
    
    ...
    
/usr/local/lib:
    
    ...
    
    libavutil.so.54 -> libavutil.so.54.15.100
    
    ...
    
/lib:
    
    ...
    
/sbin/ldconfig: /lib/ld-linux.so.3 is the dynamic linker, ignoring
    
    ...
    
/usr/lib:
    
    ...
    
/usr/lib/arm-linux-gnueabihf/neon: (hwcap: 0x0000000000001000)
    
/usr/lib/arm-linux-gnueabihf/neon/vfp: (hwcap: 0x0000000000001040)
    
    ...
    
    libavutil.so.52 -> libavutil.so.52.3.0
    
    ...

  • Old XBM image-based demo I keep forgetting to upload, still linked from P01’s nifty "Defender of the Favicon" demo : http://www.p01.org/releases/DEFENDER_of_the_favicon/

    24 juin 2011

    + demo/page-player/xbm-test.html Old XBM image-based demo I keep forgetting to upload, still linked from P01’s nifty "Defender of the Favicon" demo : http://www.p01.org/releases/DEFENDER_of_the_favicon/

  • Grab audio samples with ffmpeg and C, error with official example code

    31 août 2020, par nji9

    For dev with mingw-w64 I'm using ffmpeg v. 4.3.1. and also the latest Git version of ffmpeg (Zeranoe's Windows 64 builds).

    


    I get "strange" problems when running the official example code for decoding audio

    


    https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/decode_audio.c

    


    MP3DirectCut(Lib-bass).mp3

    


    http://www.mediafire.com/file/ozmjjcpwyhhdnr7/MP3DirectCut(Lib-bass).mp3/file

    


    Generates pcm, but outputs :

    


    "Warning: the sample format the decoder produced is planar (s16p).
This example will output the first channel only."


    


    But the output pcm has both channels !??

    


    When recoding the above mp3 to wav with ffmpeg (4.1.4, no error message)

    


    http://www.mediafire.com/file/gcq7ryg43pd57q5/ffmpeg4.1.4.wav/file

    


    and also when recoding the latter to mp3 again

    


    http://www.mediafire.com/file/ij865dkrprn2lta/ffmpeg4.1.4_recode.mp3/file

    


    the example code breaks and produces these error messages :

    


    avcodec_send_packet ()&#xA;from within:&#xA;"[mp2 @ <someaddress>] Header missing"&#xA;and returns error code -1094995529&#xA;(= "Invalid data found when processing input")&#xA;</someaddress>

    &#xA;

    It produces that error message for literally all other formats&#xA;I tried, and also when written with another editor (Audition 3.0).&#xA;But all the files play and show fine on all programs I have.

    &#xA;

    I'm at a lost at this point.&#xA;What is going on and wrong here ?

    &#xA;

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