[Libav-user] H.264 always enabled on OS X.. ?

[Lucas Soltic]

Le 13 mai 2012 à 13:57, Carl Eugen Hoyos a écrit :

> Lucas Soltic <soltic.lucas at ...> writes:
> 
>> Today I noticed something weird about the enabled decoders.
>> Is it normal that ./configure --disable-yasm --disable-decoders 
>> --disable-encoders --disable-muxers gives me that?
> 
>> Enabled decoders:
>> h264
> 
>> Enabled hwaccels:
>> h264_vda
> 
> (I can only guess because I am not on OS X.)
> By default, hwaccels are enabled / autodetected. Since you did not 
> disable hwaccels, h264_vda was detected and enabled and since it 
> required the h264 (software) decoder, this decoder was also enabled.
> 
> I do understand why you suspect a bug, but it can be argued that 
> this is intended, if you want to disable the software decoder (and 
> don't need h264_vda), use --disable-hwaccels.

You are right. Using --disable-hwaccels removes h264 from the enabled decoders list. However it still seems a bit odd to enable a decoder when I ask to disable all of them. I'm using --disable-decoders so that I can do --enable-decoder=... for each decoder I want, and no other one.

This is especially useful as I want to distribute binaries that are not concerned by royalties. But as I understand it, here it uses the hardware decoder, thus it's not a decoder made by FFmpeg, but a decoder provided by the OS, thus a binary using this hardware decoder should not be concerned by royalties.

> Could you explain what you are trying to achieve with --disable-decoders 
> --disable-encoders --disable-muxers? If you only need demuxers, I 
> wonder how good they work with --disable-decoders...

Well, it was just for testing purposes, I agree the options I put are meaningless. I added some --disable-... options only in order to make the output a bit shorter.

Thanks for your help :) .

> 
> Note that there is --disable-everything (which can be combined with 
> enable-options) which you may be searching for.
> 
> Carl Eugen
> 
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