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On 9/23/25 7:16 PM, Bruce Dubbs ([email protected] via blfs-dev
Mailing List) wrote:
> On 9/23/25 5:58 PM, Joe Locash ([email protected] via blfs-dev Mailing
> List) wrote:
>> On 9/23/25 6:40 PM, Bruce Dubbs ([email protected] via blfs-dev
>> Mailing List) wrote:
>>> On 9/23/25 5:16 PM, Joe Locash ([email protected] via blfs-dev
>>> Mailing List) wrote:
>>>> On 9/23/25 1:45 PM, Rahul Chandra ([email protected] via
>>>> blfs-dev Mailing List) wrote:
>>>>> We can actually do more then just that. Because Firefox only links
>>>>> to ffmpeg at runtime, you can actually keep both 8.0 and 7.1.1
>>>>> installed (what I've been doing for the last week). You
>>>>> essentially just have to keep all the .so files except the ones
>>>>> that should link to the latest version (i.e ending in just .so and
>>>>> not .so.58). I've been doing this for the last week and firefox
>>>>> works great for me and packages are still linking to ffmpeg 8.0 at
>>>>> build time. Something similar to this:
>>>>> https://gitlab.archlinux.org/archlinux/packaging/packages/ffmpeg4.4
>>>>
>>>> I would say this is the best approach. Firefox-140 only needs the
>>>> ffmpeg-7.1 libs and that's easy to do. Do a normal build of
>>>> ffmpeg-7 but only install the libs
>>>> :
>>>>
>>>> make DESTDIR=dest install
>>>> as root:
>>>> for lib in dest/usr/lib/*; do
>>>> if [[ $lib == *.so ]]; then
>>>> ln -srf -- dest/usr/lib/"$(readlink "$lib")" "$lib"
>>>> elif [[ ! -d $lib ]]; then
>>>> mv "$lib" /usr/lib
>>>> fi
>>>> done
>>>
>>> I'm not sure if I got this right, but I installed ffmpeg8 as a
>>> DESTDIR=/opt/ffmpeg8/
>>>
>>> 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.
>>>
>>> Is there a way to see what libraries are being used?
>>
>> I'm not sure. If you have ffmpeg-7 installed you will not see an issue.
>
> I do have ffmpeg7 installed, but I think the LD_LIBRARY_PATH tells it
> where to look first. Google says:
Oh boy.
> Functionality:
> When an application starts, the dynamic linker checks LD_LIBRARY_PATH
> for a colon-separated list of directories to search before looking in
> the standard system library paths (like /lib, /usr/lib, /usr/local/lib).
>
> Which was my current understanding.
>
> 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
Currently FF will not look for libavcodec.so.62. It has an internal
wrapper that looks for for ffmpeg versions and right now it's capped at
.61. So it's picking up your 7.1 install.
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