Re: FFmpeg-8.0 Warning

On 9/24/25 6:45 PM, Bruce Dubbs ([email protected] via blfs-dev 
Mailing List) wrote:
> 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. 

I don't think you completely understand the issue.  The problem is that 
firefox will not even attempt to open the ffmpeg-8 libraries (mainly 
libavcodec.so.62) because it's internal ffmpeg code doesn't look for 
that library so changing LD_LIBRARY_PATH will have no effect. On a 
system with ffmpeg-8 only installed parts of firefox are broken (mainly 
streaming). Installing the ffmpeg-7 libs or changing LD_LIBRARY_PATH to 
include the location of those libs will fix the issue.

-- 
http://lists.linuxfromscratch.org/sympa/info/blfs-dev
Unsubscribe: See the above information page