Hi,
I am using a Zeranoe build of ffmpeg 1.2.1 for windows 32-bit. I am also using
Java Native Access (JNA) to do the reading and writing of Java InputStreams.
Has anyone had success using custom i/o reads and seeks with Zeranoe builds?
Are there any known bugs with custom i/o in this version?
I set AVFormatCtx pFormatCtx.debug=1 to see the debug messages for reading
packets and frames. Packets and frames are read correctly during:
avformat_open_input();
avformat_find_stream_info();
However during the main reading/decoding loop:
while (av_read_frame(pFormatCtx, &pkt) > 0)
{
.
.
.
av_free_packet(&pkt)
}
Frames are read correctly up to a point. Then for the next packet, pkt.size is
less than what was read during the avformat_find_stream_info() call. This
packet happens to be an audio packet and the av_decode_audio4 call fails. The
next read returns a video packet, but pkt.size is also less than what was read
earlier. I can read no more packets after this.
I have tried setting different buffer sizes including zero (null) when I open
the context avio_alloc_context(). This has no effect on the results. I also
tried setting AVFMT_FLAG_CUSTOM_IO and AVFMT_FLAG_NO_BUFFER: same results. I
can only read and decode to the exact same point every time.
-Felix
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