[Libav-user] How to access the struct AVCodecTag?

Giuseppe Torelli giutorcom at gmail.com
Tue Mar 17 22:50:18 EET 2020

Hi Carl,

many thanks for replying. I'm really surprised there is no way to get all
the encoders linked to a particular container. I was able to use
avcodec_find_encoder(28) where 28 is the ID for MPEG-4 Part 14 and I
correctly get "libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10" but of
course there is also libx265 that encodes a video in the MP4 format. I
thought it was possible to get sich a list.

Many thanks for replying.
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On Tue, 17 Mar 2020 at 20:45, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:

> Am Di., 17. März 2020 um 20:42 Uhr schrieb Giuseppe Torelli
> <giutorcom at gmail.com>:
> > I want to fill two combo boxes in a GTK+3 program with the container and
> its relevant codecs.
> You cannot use AVCodecTag to achieve this, library users are not
> supposed to access it.
> FFmpeg does not export information about supported codecs in containers,
> this
> information is not even always available within libavformat, users are
> allowed
> to abuse the library.
> I believe you - as gui author - are responsible to offer compatible
> combinations to
> your users.
> Carl Eugen
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