In case you need it to debug flvdec.c

amf_dump.c

static void amf_dump(AVFormatContext *s)
{
    AVIOContext *pb = s->pb;
    int v;
    char buf[1024];

    if (pb->eof_reached)
        return;

    switch ((v = avio_r8(pb))) {
    case AMF_DATA_TYPE_NUMBER:
        av_log(s, AV_LOG_DEBUG, " number %g\n",
               av_int2double(avio_rb64(pb)));
        break;
    case AMF_DATA_TYPE_BOOL:
        av_log(s, AV_LOG_DEBUG, " bool %d\n", avio_r8(pb));
        break;
    case AMF_DATA_TYPE_STRING:
        v = amf_get_string(pb, buf, sizeof(buf));
        if (v > 0)
            av_log(s, AV_LOG_DEBUG, " string '%s'\n", buf);
        break;
    case AMF_DATA_TYPE_NULL:
        av_log(s, AV_LOG_DEBUG, " NULL\n");
        break;
    case AMF_DATA_TYPE_MIXEDARRAY:
        avio_skip(pb, 4);
    case AMF_DATA_TYPE_OBJECT:
        av_log(s, AV_LOG_DEBUG, " {\n");
        do {
            v = amf_get_string(pb, buf, sizeof(buf));
            if (v < 0) {
                return;
            } else if (v > 0) {
                av_log(s, AV_LOG_DEBUG, "  '%s' :", buf);
                amf_dump(s);
            } else
                break; // End object reached
        } while(1);
    case AMF_DATA_TYPE_OBJECT_END:
        av_log(s, AV_LOG_DEBUG, " }\n");
        break;
    default:
        av_log(s, AV_LOG_WARNING, "Unknown value %d", v);
        break;
    }
}