Unable to load DLL 'avutil.56' error

[srht]

I'm trying to use the library in asp.net web application that runs with .net framework 4.7.2. I set FFmpegLoader.FFmpegPath to the dll files that I downloaded win64 modes from https://github.com/BtbN/FFmpeg-Builds/releases My application is 64 bit. Then it gives Unable to load DLL 'avutil.56' error. How can I solve this?

[NurulloSulaymonov]

same with me

[NurulloSulaymonov]

@srht here is the solution https://github.com/Ruslan-B/FFmpeg.AutoGen/issues/192#issuecomment-1018171060

[Ruslan-B]

@srht which release you downloaded? I guess for a while you have to stick to 4.4. As I updated foundation library for FFMediaToolkit just yesterday.

[Norc89]

When this is planned to be fixed ?

[radek-k]

I've updated the package.

[Norc89]

I've updated the package.

Fix is updated in 4.4 or 5.0 version ?

[radek-k]

5.0

[Norc89]

5.0 I have try now in dotnet application which i run on windows and is working how it should. After i copy everything to RaspberrPi there i get again: "Unable to load DLL 'avutil.57 under /home/pi/DigitalSignageV2/ffmpeg/':" Should I use there any other dlls? or what approach should i use for RaspberryPi?

[radek-k]

Which FFmpeg build have you downloaded? Try installing FFmpeg using apt, then set the FFmpegPath to "/usr/local/lib/"

[Norc89]

Which FFmpeg build have you downloaded? Try installing FFmpeg using apt, then set the FFmpegPath to "/usr/local/lib/"

Is possible that we continue this conversation in private chat?

[Norc89]

Which FFmpeg build have you downloaded? Try installing FFmpeg using apt, then set the FFmpegPath to "/usr/local/lib/"

I have try both builds gpl-shared and lgpl-shared. I really need to get this working on raspberry. I don't even know if is possible to get running dlls on Raspi.

[hey-red]

I think you need ARM build for RPI. Do you download right version?

[Ruslan-B]

RPI linux distributive has to have package manager in any normal linux version (if assembled by hand I would expect OP knows what do) - what could possible go wrong?

[tottaka]

Has anyone gotten this to work? I'm having the same exact issue on the Raspberry PI 4 (Debian Bullseye). I installed ffmpeg from apt (ffmpeg is already the newest version (7:4.3.4-0+deb11u1+rpt1))

I ran ldd /usr/bin/ffmpeg which told me the .so files were located in "/lib/aarch64-linux-gnu/" so I tried that first, same error.

I then tried setting ffmpeg path "/usr/local/lib/" and still got the error. I couldn't find the "Prefer 32-bit" option in VS2022 so I tried building for ARM64 which still gave me the same error.

Running command file `which ffmpeg` gives me: /usr/bin/ffmpeg: ELF 64-bit LSB pie executable, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, BuildID[sha1]=1e9e84ad62abcf8f99020bdcbf9b7d5a79e529a4, for GNU/Linux 3.7.0, stripped

Running ldd /usr/bin/ffmpeg | grep "avutil" outputs: libavutil.so.56 => /lib/aarch64-linux-gnu/libavutil.so.56 (0x0000007f9289f000)

So maybe that's where the problem occurs? Is there a way to get version .57 instead of .56?

[hey-red]

@tottaka Your installed ffmpeg version is 4.3.4, but latest FFMediaToolkit works only with 5.x.x Possible solutions:

• Add debian repository with newest ffmpeg(switch to testing or upgrade to next debian release).
• Build ffmpeg from sources or download binary packages for aarch64 and set full path to ffmpeg binaries(FFmpegLoader.FFmpegPath="/path/to/ffmpeg")
• Install old FFMediaToolkit package(not recommended)

[tottaka]

@hey-red I got it working by building ffmpeg 5.0 from source. I did have to include build option --enable-shared otherwise the .so files were not generated. Also I think running ldconfig made links to the libs in "/usr/local/lib" so I was able to set FFmpegLoader.FFmpegPath to that instead of the full path to ffmpeg.

It's a shame the default apt repository is using an outdated ffmpeg version...

Thank you!