Hi,

I have an mpeg stream where the probing does not find one (vobsub subtitle) 
stream because it appears to late.
However, I know that such a stream exists.

Currently, given my input AVFormatContext, I try to create a new subtitle 
stream with:
```
AVFormatContext* ifmt_ctx = ...;
AVStream* stream = avformat_new_stream(ifmt_ctx, NULL);

stream->codecpar->codec_id = AV_CODEC_ID_DVD_SUBTITLE;
stream->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
```

However, when I then read packets from the stream with av_read_frame() and the 
subtitle stream appears, it is not assigned to my newly created stream, but to 
another new one.

Is there a way to preallocate the subtitle stream (before any call to 
av_read_frame() but in a way, that av_read_frame assigns the packet to exactly 
this manually created stream?

Thanks
Gerion

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