save avpack raw data into h264 file, but it can't play,help!

[jcyhcs]

container is FLV, how can i save raw h264 file?

[h4tr3d]

Don't write raw h264 data to the file. Try to use h264 muxer.

[h4tr3d]

Sample, that works for me:

#include <iostream>

#include "av.h"
#include "format.h"
#include "codeccontext.h"
#include "formatcontext.h"

using namespace std;

int main(int argc, char** argv)
{
    if (argc < 3)
        return 2;

    string input_uri{argv[1]};
    string output_uri{argv[2]};

    av::init();

    //
    // INPUT
    //
    av::FormatContext ictx;

    ictx.openInput(input_uri);
    ictx.findStreamInfo();

    ssize_t video_stream = -1;

    //
    // OUTPUT
    //
    av::OutputFormat oformat("h264");
    av::FormatContext octx;
    octx.setFormat(oformat);

    for (size_t i = 0; i < ictx.streamsCount(); ++i) {
        auto st = ictx.stream(i);
        auto coder = av::GenericCodecContext(st);

        if (!st.isVideo())
            continue;

        if (!octx.outputFormat().codecSupported(coder.codec()))
            continue;

        auto ost = octx.addStream(coder.codec());
        ost.setTimeBase(st.timeBase());
        auto ocoder = av::GenericCodecContext(ost);

        ocoder.copyContextFrom(coder);

        video_stream = i;
        break;
    }

    clog << "VideoStream: " << video_stream << '\n';

    octx.openOutput(output_uri);
    octx.writeHeader();
    octx.dump();

    while (true) {
        auto pkt = ictx.readPacket();
        if (!pkt)
            break;

        if (pkt.streamIndex() != video_stream)
            continue;

        pkt.setStreamIndex(0);
        octx.writePacket(pkt);
    }

    octx.writePacket();
    octx.writeTrailer();

    return 0;
}

[jcyhcs]

one more question, i want to get raw h264 packet , then send to HARDWARE DECODER, but if use your example, how can realize this function? i try some code like this:

i just test my code is ok,it can create h264 file, and it can play, and the raw packet can send to hardware decoder. BUT, it this code RIGHT? it this code have memory leak?? PLEASE HELP ME!

[h4tr3d]

Just read about format of h264 packets and difference between Annex-B format and AVCC format. Start from here.

Basically, AVPacket contains NALU without [start code]. I deeply work only with Xilinx VCU via OpenMAX interface. This decoder expects packets in AnnexB format with start codes.

FFmpeg "h264" format saves frames into container in AnnexB format. You can do it manually by prepend 0x01000000 to the pkt.data().

Similar things done by BSF (bitstream filter) that used by your last sample.

By my opinion, it is not a good idea to use same AVPacket pointer to receive processed packets from bistream filter chain.