[Libav-user] enumerating codec_tags

[Steffen.Roeber at hella.com]

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

Hi,
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 && 
av_codec_is_encoder(encoder))
            {
//...
            }

            ++tag;
          }
        }
What I need, are all codec that are supported by a AVOutputFormat.

Kind regards
Steffen


Hella Aglaia Mobile Vision GmbH
Steffen Roeber
Firmware & Tools
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