[Libav-user] enumerating codec_tags

Steffen.Roeber at hella.com Steffen.Roeber at hella.com
Tue May 26 08:17:39 CEST 2015

I want to show a list of codecs that are supported by a specified file 
extension (for example .avi or .mp4).

> What I need, are all codec that are supported
> by a AVOutputFormat.

There is AVOutputFormat->codec_tag but 
you are to some degree expected to 
know what you put into a container.

Please explain your exact usecase.

Carl Eugen

is there any way to iterate through all codec_tags of an AVOutputFormat 
without using the private header internal.h? I need that header because 
AVCodecTag is there.
Currently I'm trying something like:
auto enumFormat = av_guess_format(nullptr, qPrintable(extension), nullptr
for (uint32 i = 0; enumFormat->codec_tag && enumFormat->codec_tag[i]; ++i)
          auto tag = enumFormat->codec_tag[i];

          while (tag->id != AV_CODEC_ID_NONE)
            encoder = avcodec_find_encoder(tag->id);

            if (encoder && encoder->type == AVMEDIA_TYPE_VIDEO && 

What I need, are all codec that are supported by a AVOutputFormat.

Kind regards

Hella Aglaia Mobile Vision GmbH
Steffen Roeber
Firmware & Tools
Treskowstr. 14, D-13089 Berlin
Amtsgericht Berlin-Charlottenburg HRB 66976 B
Geschäftsführer: Kay Talmi

Fon:  +49 30 200 04 29– 412
Fax:  +49 30 200 04 29– 109
Mail: Steffen.Roeber at hella.com
URL: www.aglaia-gmbh.de

URL: www.mobilevision.de

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