Hi all.
I am developing an application, capturing MPEG2 Transport Stream and
saving its parts to a file (for example, a video stream and one of
accompanying audio streams).
I use my own functions to parse the Transport Stream and FFmpeg's
functions to store audio and video data to a file.
I could not find any documentation about using MpegTS parser from the
FFmpeg, and I also need to represent the data somehow to a user,
therefore, I preferred using my own data structures.
My understanding was that if av_parser_parse returns not zero
poutbuf_size, the buffer, passed to it contains a complete video or
audio frame.
Therefore, generally my code is
[accumulate data]
int r=av_parser_parse(parser,codec_ctx,&samples,&frame_size,
bitstream,bitstream_size,pts,dts)
if(frame_size>0) {
int r;
AVPacket avpacket;
if(!m_header_written) {
av_write_header(m_pFormatCtx);
m_header_written=true;
}
avpacket.stream_index = index;
avpacket.pts=pts;
avpacket.dts=dts;
avpacket.duration =(int64_t)0;//TODO:I still don't know how
tocalculate
avpacket.data=bitstream;
avpacket.size=frame_size;
int r = av_interleaved_write_frame(m_pFormatCtx, &avpacket);
bitstream_size=0;
}
However, during av_interleaved_write_frame I get several dozens of
messages like
[dvd @ 6A8FC980]buffer underflow i=0 bufi=20227 size=46436
[dvd @ 6A8FC980]buffer underflow i=0 bufi=22251 size=46436
[dvd @ 6A8FC980]buffer underflow i=0 bufi=24275 size=46436
[dvd @ 6A8FC980]buffer underflow i=0 bufi=26299 size=46436
[dvd @ 6A8FC980]buffer underflow i=0 bufi=28323 size=46436
46436 is the frame_size value returned by av_parser_parse.
What's wrong??
Please, help me to resolve this, as I am going insane while struggling
with the libraries.
FFmpeg is a great software, but definitely, it lacks some up to date
documentation. I understand, that its developers simply don't have
enough time for it, as so as for reading mailing lists.
Thank you very much in advance, and very-very waiting for the answer.
Vladimir.
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