[FFmpeg-user] Compiling independent ffmpeg

[Matthew Webber]

Yellow Penguin,

Thank you for your explanation on this. You've just answered my question.

Matthew Webber
(QuickHare at Hotmail.com)

On 12/01/2020 21:17, Yellow Penguin wrote:
> The package liblensfun1 is a dependency of liblensfun-dev. Maybe you used
> aptitude or used apt-get autoremove at a later time to remove any orphaned
> package? If it got installed as a dependency of liblensfun-dev, it will no
> longer be a dependency of any package after you uninstalled that. The
> library liblensfun1.so.1 that you were missing is part of the liblensfun1
> package, not the -dev package. The same applies to the other ones. It's
> safe to remove the -dev packages, but you will have to ensure that the
> corresponding runtime packages are installed, and they are easily lost if
> you don't explicitly install them or mark them as a dependency of something
> else.
>
> On Sun, Jan 12, 2020 at 9:22 PM Matthew Webber <quickhare at hotmail.com>
> wrote:
>
>> Carl,
>>
>> Thanks for this. I definitely did uninstall liblensfun-dev and not
>> liblensfun. It may be that one is dependent on another, but that is
>> definitely what I uninstalled through sudo apt-get remove liblensfun-dev.
>>
>> Other packages I installed during compilation were subsequently
>> uninstalled without issue. Therefore I see it as an ffmpeg compilation,
>> otherwise I'd see every other feature I uninstalled failing. I noticed
>> the make and make install steps created and copied the other dependencies.
>>
>> I don't mind dynamic linking, but I assumed the compilation step of
>> ffmpeg also compiled any dependent libraries it used. Obviously this is
>> not clear in guides and instructions that you'd need to leave all the
>> dev packages you use after compilation.
>>
>> Matthew Webber
>> (QuickHare at Hotmail.com)
>>
>> On 12/01/2020 20:07, Carl Eugen Hoyos wrote:
>>> Am So., 12. Jan. 2020 um 19:38 Uhr schrieb Matthew Webber
>>> <quickhare at hotmail.com>:
>>>
>>>> I compiled ffmpeg on Ubuntu 18.04 perfectly fine. I installed a whole
>>>> load of dev packages and compiled with lots of options, and all went
>>>> smoothly.
>>>>
>>>> However when I removed the packages liblensfun-dev, libmodplug-dev,
>>>> libcodec2-dev and libfdk-aac-dev ffmpeg failed to work. Looking deeper
>>>> it is now missing liblensfun.so.1, libmodplug.so.1, libcodec2.so.0.7 and
>>>> libfdk-aac.so.1.
>>> So you did not uninstall liblensfun-dev but liblensfun
>>>
>>>> Re-installing those packages makes those components
>>>> available and the program runs again.
>>>>
>>>> Does the compilation not create these files or embed them into ffmpeg?
>>> No (at least not in general), and this question is not related to FFmpeg.
>>> Once upon a time, no dynamic libraries existed, meaning that every binary
>>> on a system contained copies of all linked libraries. As this wastes a
>> lot of
>>> space, dynamic linking was invented (decades ago).
>>> Typical compilers default to dynamic linking.
>>>
>>>> Are there any options I need to ensure these are created so I no longer
>>>> need these packages? I want to have program files that will work without
>>>> any of the other packages installed.
>>> You can add "--extra-ldflags=-static" to force static linking but your
>>> distribution most likely will not provide a static lensfun library, so
>> you
>>> will have to compile all dependencies that you want yourself to
>>> provide the necessary static libraries.
>>>
>>> But as said, all this is not related to FFmpeg.
>>>
>>> Carl Eugen
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