int av_packet_copy_props(AVPacket *dst, const AVPacket *src)
{
    int i;

    dst->pts                  = src->pts;
    dst->dts                  = src->dts;
    dst->pos                  = src->pos;
    dst->duration             = src->duration;
    dst->convergence_duration = src->convergence_duration;
    dst->flags                = src->flags;
    dst->stream_index         = src->stream_index;

    for (i = 0; i < src->side_data_elems; i++) {
         enum AVPacketSideDataType type = src->side_data[i].type;
         int size          = src->side_data[i].size;
         uint8_t *src_data = src->side_data[i].data;
         uint8_t *dst_data = av_packet_new_side_data(dst, type, size);

        if (!dst_data) {
            av_packet_free_side_data(dst);
            return AVERROR(ENOMEM);
        }
        memcpy(dst_data, src_data, size);
    }

    return 0;
}