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I've got an mpegts file with two PES. One is an H.264 video stream, the
other is a private data stream containing KLV metadata. I need to access
the metadata as well as decoding the video. Looks like the private PES
is dropped in most cases by libavformat. I was able to modify mpegts.c a
bit to add a new PES stream for the private data stream. Packets are
parsed as they are decoded but I can't figure out how to get them to my
app as they are still ignored somewhere in the mpegts parsing code which
is a little difficult to follow. Can someone suggest a way to get this
data? It doesn't matter if I get raw data packets for the stream or if I
have to write a codec to decode the KLV metadata, I just need to get the
stream data somehow as it is parsed. There are many fewer packets in the
metadata stream than in the video stream. I'm currently doing something
similar to this to pull video frames:
while(!streamFinised)
{
while(bytesRemaining)
{
bytesDecoded = avcodec_decode_video(codecCtx, &nextFrame,
&isFrameFinished, rawPacketData, bytesRemaining);
bytesRemaining -= bytesDecoded;
rawPacketData += bytesDecoded;
if (frameFinished) return;
}
do
{
if(av_read_packet(formatCtx, &packet) < 0)
{
streamFinished = true;
break;
}
} while(packet.stream_index != streamId);
if(!streamFinished)
{
bytesRemaining = packet.size;
rawPacketData = packet.data;
}
}
Some more details about the private data stream:
PID: 0x01f1
stream_type: 0x06 (H.222.0 | 13818-1 Private PES Packets)
registration_descriptor
tag: 0x05
length: 4
format_identifies: 0x4b4c5641 (KLVA)
metadata_std_descriptor
tag: 0x27
length: 9
metadata_input_leak_rate: 625
metadata_buffer_size: 2
metadata_output_leak_rate: 0
PES stream_id: 0xbd
- ------------------------------
Trevor R.H. Clarke
Ball Aerospace & Technologies Corp
Opticks, Free Your Imagery (http://opticks.ballforge.net
GPG key available on random.sks.keyserver.penguin.de
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=r+bt
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