I've just started to learn about VP8, so give me some slack if this is a
dumb question.
H.264 Example
In the past I've worked mostly with H.264. Whenever I needed to parse H.264
bit streams, I would leverage libav to help me and use something like this
av_register_all();
_ioContext = avio_alloc_context(
encodedData,
H264_READER_BUF_SIZE,
0,
0,
&readFunction,
NULL,
NULL);
if (_ioContext == NULL)
throw std::exception("Unable to create AV IO Context");
AVInputFormat *h264Format = av_find_input_format("h264");
if (h264Format == NULL) {
throw std::exception("Unable to find H264 Format");
}
_context = avformat_alloc_context();
_context->pb = _ioContext;
ret = avformat_open_input(&_context,
"",
h264Format,
NULL);
if (ret != 0) {
throw std::exception(
"Failed to open input file :" +
std::string(_avErrToString(ret)));
}
....
....
int ret = av_read_frame(_context, &_packet);
VP8
The above method has worked great for parsing the H.264 bit streams and
providing me with H.264 frames to feed to my own decoding infrastructure.
I'm trying to duplicate the same effort with VP8. I tried using this code
as a basis and instead of looking for the "h264" format, I've tried "vp8"
and "webm". "vp8" doesn't seem valid, but "webm" is able to load a format.
However when I get to avformat_open_input I get this error:
[matroska,webm @ 0x101812400] Unknown entry 0xF0
[matroska,webm @ 0x101812400] EBML header using unsupported features
(EBML version 0, doctype (null), doc version 0)
Failed to open input file :Not yet implemented in FFmpeg, patches welcome
Am I out of look? Or am I just approaching this incorrectly?
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