Re: FFmpeg-8.0 Warning

On 9/24/25 3:46 PM, Joe Locash ([email protected] via blfs-dev Mailing List) wrote:
> On 9/23/25 7:31 PM, Bruce Dubbs ([email protected] via blfs-dev Mailing List) wrote:
>> On 9/23/25 6:22 PM, "Douglas R. Reno" ([email protected] via blfs-dev 
>> Mailing List) wrote:

[snip]

>>>>>> Then I created a script:
>>>>>>
>>>>>> $ cat firefox-ffmpeg8
>>>>>> #! /usr/bin/bash
>>>>>>
>>>>>> export LD_LIBRARY_PATH=/opt/ffmpeg8/usr/lib/
>>>>>> firefox
>>>>>>
>>>>>>
>>>>>> And ran a random youtube video.  It seemed to play fine, but I'm not sure if it 
>>>>>> picked up the right libraries.
>>>>>>

[snip]

>>>> In the case of firefox, I can't tell for sure which version of, say, 
>>>> libavcodec.so it is using.  I have two:
>>>>
>>>> $ ll /usr/lib/libavcodec.so
>>>> lrwxrwxrwx 1 root root 23 Aug 21 18:02 /usr/lib/libavcodec.so -> 
>>>> libavcodec.so.61.19.101
>>>>
>>>> $ ll /opt/ffmpeg8/usr/lib/libavcodec.so
>>>> lrwxrwxrwx 1 root root 23 Sep 23 13:36 /opt/ffmpeg8/usr/lib/libavcodec.so -> 
>>>> libavcodec.so.62.11.100

[snip]

>> So it is loading ffmpeg7.  Upon reconsideration, a library libxxx.so is normally 
>> only used at link time.  Trying to use LD_LIBRARY_PATH won't work in this 
>> circumstance will not work. 
> 
> LD_LIBRARY_PATH will work. Firefox doesn't directly link against a specific version 
> of the ffmpeg libraries. It's internal code accounts for various versions of ffmpeg 
> and then checks for the version of the ffmpeg libraries that might be installed. See 
> dom/media/platforms/ffmpeg/FFmpegRuntimeLinker.cpp in the FF source for more info on 
> the versions checked for. It will find the ffmpeg-7 libs just fine using 
> LD_LIBRARY_PATH.

Joe,  I my test it didn't work.  In my test script above I tried to redirect the 
location to the ffmpeg8 libraries with LD_LIBRARY_PATH, but it still picked up the 
ffmpeg7 libraries.

   -- Bruce

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