Hi,
i'm not really sure but i think a found a bug in the avi decoder of
avformat.
In the following function of the avidec.c:
static int avi_read_header(AVFormatContext *s)
{
...
switch (tag) {
...
case MKTAG('s', 't', 'r', 'f'):
/* stream header */
if (!size)
break;
if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
avio_skip(pb, size);
} else {
...
switch (codec_type) {
...
default:
st->codec->codec_type = AVMEDIA_TYPE_DATA;
st->codec->codec_id = AV_CODEC_ID_NONE;
st->codec->codec_tag = 0;
avio_skip(pb, size);
break;
}
}
break;
...
}
If the codec_type is AVMEDIA_TYPE_DATA, but the format is empty (size=0)
(which i think is allowed), then the codec_id is not set to
AV_CODEC_ID_NONE.
This will generate a trace when calling the avformat_find_stream_info:
"Could not find codec parameters for stream 1 (Unknown: none): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize'
options"
I'm not really sure about he AVI spec if the format is mandatory or not,
but i think there is a bug.
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