> For the encoding part instead I do not understand how I am supposed to set
> the id2v3tag field of the encoder’s ADTSContext [1], which apparently if set
> is going to be written in the header. Any help/hint would be greatly
> appreciated.
Got it. Posting here the answer for future readers.
There are two things that have to be done:
- set the id3v2 metadata of the target AVFormatContext
```c
const AVDictionaryEntry *e = NULL;
while ((e = av_dict_iterate(metadata, e))) {
av_dict_set(&fmtctx->metadata, e->key, e->value, 0);
}
```
- When writing the header, set the appropriate option (in this case write_id3v2
for the ADTS encoder)
```c
AVDictionary *opts = NULL;
av_dict_set_int(&opts, "write_id3v2", 1, 0);
ret = avformat_write_header(encoder->fmt, &opts);
```
Done!
Cheers,
Daniel
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